No signal after switching input source

AstraUrtyp · 2025-06-14 11:41:43

Hello,

I got a two systems. One Windows-Laptop for work and my main archlinux desktop maschine. Sometimes I got both system running at the same time and I switch between them with my monitor (Dell u2722de) which has a build in kvm. My windows work laptop is connected via usb-c and my main device via displayport.

My problem is, that if I switch between the maschines I got no signal anymore on the archlinux maschine.

I found this thread which was solved by using DP instead of HDMI, but I am doing that already..
https://bbs.archlinux.org/viewtopic.php?id=269822

Any other ideas how I could solve this problem?

Operating System: Arch Linux 
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.1
Kernel Version: 6.15.2-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600 6-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 6700 XT
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7C95
System Version: 1.0

Last edited by AstraUrtyp (2025-06-14 11:54:48)

seth · 2025-06-14 14:26:49

Can you switch the VT and get an output?
Can you there login and run "kscreen-doctor"?

What's likely happening is that the output unregisters, kscreen removes it and then doesn't automatically re-enable it when it shows up. I'd tell you to just disable the kscreen daemon but afaiu that's not possible on wayland.
But maybe you can configure a shortcut or add a udev rule to automatically enable it.
https://wiki.archlinux.org/title/Udev#E … _unplugged - the example is for X11, you'll have to use kscreen-doctor to enable it.

AstraUrtyp · 2025-06-14 17:00:17

I cant get a VT sadly.

I just rechecked and tested the output switch from a TTY2 and from SDDM, both were able to recover the signal. I cant even ssh into the maschine from my laptop to run `kscreen-doctor`..

The udev rule states thats its meant to be used for unplugging, but that works fine. Than the maschine is actually able to recover the signal.. What could be the difference between changing the source and unplugging?

seth · 2025-06-14 19:28:51

I cant even ssh into the maschine from my laptop

Does it respond to "ping"? Does the system also suspend/hibernate? This doesn't seem so much a problem w/ the output/kvm if the system isn't responding at all anymore.

AstraUrtyp · 2025-06-14 19:39:00

It does not even respond to a ping, but I sshed into the maschine before switchting the input source of my monitor and got some logs with dmesg right now.

Does this help at all?

[ 9411.213872] snd_hda_codec_hdmi hdaudioC0D0: HDMI: Unknown ELD version 0
[ 9411.213883] snd_hda_codec_hdmi hdaudioC0D0: HDMI: Unknown ELD version 0
[ 9412.272138] ------------[ cut here ]------------
[ 9412.272141] WARNING: CPU: 10 PID: 232 at drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:4004 commit_planes_for_stream+0x14f6/0x1720 [amdgpu]
[ 9412.272404] Modules linked in: snd_seq_dummy snd_hrtimer snd_seq nft_masq nft_ct nft_reject_ipv4 nf_reject_ipv4 nft_reject act_csum cls_u32 sch_htb nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables bridge stp llc ccm algif_aead crypto_null des3_ede_x86_64 des_generic libdes algif_skcipher cmac md4 algif_hash af_alg cdc_mbim cdc_wdm mt7921e cdc_ncm mt7921_common cdc_ether vfat mt792x_lib usbnet fat mt76_connac_lib mt76 amd_atl intel_rapl_msr intel_rapl_common amdgpu snd_hda_codec_realtek snd_hda_codec_generic snd_hda_scodec_component snd_hda_codec_hdmi kvm_amd snd_hda_intel amdxcp snd_intel_dspcfg gpu_sched kvm snd_usb_audio btusb drm_panel_backlight_quirks snd_intel_sdw_acpi mac80211 btrtl irqbypass drm_buddy uvcvideo snd_hda_codec snd_usbmidi_lib btintel polyval_clmulni drm_exec snd_ump polyval_generic drm_suballoc_helper videobuf2_vmalloc btbcm snd_hda_core ghash_clmulni_intel snd_rawmidi drm_ttm_helper uvc btmtk libarc4 videobuf2_memops snd_hwdep ttm sha512_ssse3 snd_seq_device ee1004
[ 9412.272487]  wmi_bmof bluetooth i2c_algo_bit videobuf2_v4l2 sha256_ssse3 snd_pcm r8169 videobuf2_common sha1_ssse3 cfg80211 drm_display_helper aesni_intel r8152 sp5100_tco snd_timer realtek crypto_simd videodev cec mii mdio_devres snd cryptd i2c_piix4 rapl video k10temp i2c_smbus pcspkr rfkill soundcore mc libphy ccp mousedev joydev gpio_amdpt wmi gpio_generic mac_hid pkcs8_key_parser i2c_dev sg crypto_user dm_mod loop nfnetlink zram 842_decompress 842_compress lz4hc_compress lz4_compress ip_tables x_tables hid_logitech_hidpp hid_logitech_dj nvme nvme_core hid_multitouch nvme_keyring nvme_auth
[ 9412.272541] CPU: 10 UID: 0 PID: 232 Comm: kworker/10:1H Not tainted 6.15.2-arch1-1 #1 PREEMPT(full)  806378c57c3c21a60e39b7d20019ada706b7af8b
[ 9412.272544] Hardware name: Micro-Star International Co., Ltd. MS-7C95/B550M PRO-VDH WIFI (MS-7C95), BIOS 2.D0 12/12/2022
[ 9412.272546] Workqueue: events_highpri dm_irq_work_func [amdgpu]
[ 9412.272783] RIP: 0010:commit_planes_for_stream+0x14f6/0x1720 [amdgpu]
[ 9412.272987] Code: 61 f9 ff ff 48 c7 c2 d0 42 34 c2 31 f6 48 89 df e8 9f e4 ff ff 48 8b 83 e8 56 03 00 48 85 c0 0f 85 26 ec ff ff e9 29 ec ff ff <0f> 0b 48 8b 83 b0 05 00 00 8b b0 a8 02 00 00 85 f6 0f 84 07 f2 ff
[ 9412.272989] RSP: 0018:ffffcf710064b990 EFLAGS: 00010246
[ 9412.272991] RAX: 0000000000000000 RBX: ffff8de561800000 RCX: 0000000000000006
[ 9412.272993] RDX: ffff8de5a9b86190 RSI: ffff8de5d4f08000 RDI: ffff8de5a9b802a8
[ 9412.272994] RBP: ffff8de5a9b80000 R08: ffffcf710064b94c R09: 0000000000000004
[ 9412.272996] R10: ffffcf71210c6500 R11: ffff8de569bbcc00 R12: 0000000000000000
[ 9412.272997] R13: 0000000000000000 R14: ffff8de5a9b86188 R15: 0000000000000006
[ 9412.272998] FS:  0000000000000000(0000) GS:ffff8decc7faf000(0000) knlGS:0000000000000000
[ 9412.273000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 9412.273001] CR2: 00000b5c000f8000 CR3: 000000016bb3f000 CR4: 0000000000f50ef0
[ 9412.273003] PKRU: 55555554
[ 9412.273004] Call Trace:
[ 9412.273007]  <TASK>
[ 9412.273009]  ? srso_alias_return_thunk+0x5/0xfbef5
[ 9412.273013]  ? dcn30_validate_bandwidth+0x109/0x2c0 [amdgpu d6875a5795d59f70c86993f5464a4303fe35fc89]
[ 9412.273242]  ? dc_state_copy_internal+0x1b/0x170 [amdgpu d6875a5795d59f70c86993f5464a4303fe35fc89]
[ 9412.273515]  update_planes_and_stream_v1+0x239/0x4c0 [amdgpu d6875a5795d59f70c86993f5464a4303fe35fc89]
[ 9412.273707]  dc_commit_updates_for_stream+0x47/0xf0 [amdgpu d6875a5795d59f70c86993f5464a4303fe35fc89]
[ 9412.273891]  ? link_get_master_pipes_with_dpms_on+0x38/0x80 [amdgpu d6875a5795d59f70c86993f5464a4303fe35fc89]
[ 9412.274107]  link_set_all_streams_dpms_off_for_link+0x100/0x150 [amdgpu d6875a5795d59f70c86993f5464a4303fe35fc89]
[ 9412.274334]  link_detect+0x43e/0x560 [amdgpu d6875a5795d59f70c86993f5464a4303fe35fc89]
[ 9412.274565]  handle_hpd_irq_helper+0x118/0x1b0 [amdgpu d6875a5795d59f70c86993f5464a4303fe35fc89]
[ 9412.274777]  process_one_work+0x193/0x350
[ 9412.274781]  worker_thread+0x2d7/0x410
[ 9412.274784]  ? __pfx_worker_thread+0x10/0x10
[ 9412.274786]  kthread+0xfc/0x240
[ 9412.274789]  ? __pfx_kthread+0x10/0x10
[ 9412.274791]  ret_from_fork+0x34/0x50
[ 9412.274795]  ? __pfx_kthread+0x10/0x10
[ 9412.274796]  ret_from_fork_asm+0x1a/0x30
[ 9412.274802]  </TASK>
[ 9412.274803] ---[ end trace 0000000000000000 ]---

Edit:

Ok after some more testing I tried the same with X11 and it worked flawlessly. I kinda assumed it was a system fault because it didnt work either with hyprland, but that used wayland as well. Anything I can do to make this work?
The `[ 9411.213872] snd_hda_codec_hdmi hdaudioC0D0: HDMI: Unknown ELD version 0` line was also present with x11 so I dont think thats the root cause.

Last edited by AstraUrtyp (2025-06-14 20:07:25)

seth · 2025-06-14 20:29:40

Do you know how to disable (automatic) DPMS on your display server?
At least the kernel warning points there and it might make sense that the display server tries to send a non-exsting output to sleep and stumbles into a amdgpu bug

Does this also happen w/ the LTS kernel?

AstraUrtyp · 2025-06-14 21:25:21

I do not know how I can disable DPMS on wayland sadly.

With the LTS-kernel it the input source switch works, kwin_wayland crashes. This is the bug report.

Application: KWin (kwin_wayland), signal: Segmentation fault


This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.archlinux.org>
Enable debuginfod for this session? (y or [n]) [answered N; input not from terminal]
Debuginfod has been disabled.
To make this setting permanent, add 'set debuginfod enabled off' to .gdbinit.

warning: Can't open file /memfd:kwayland-shared (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:JSVMStack:QtQml (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:wayland-cursor (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:JSGCHeap:QtQml (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:JITCode:QtQml (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:xwayland-shared (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:unknown-usage:QtQml (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:wayland-shm (deleted) during file-backed mapping note processing
[New LWP 956]
[New LWP 990]
[New LWP 1003]
[New LWP 1004]
[New LWP 1002]
[New LWP 1005]
[New LWP 1007]
[New LWP 1012]
[New LWP 1008]
[New LWP 1036]
[New LWP 1034]
[New LWP 1006]
[New LWP 1033]
[New LWP 1042]
[New LWP 1035]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/kwin_wayland --wayland-fd 8 --socket wayland-0 --xwayland-fd 9 --xwayland-fd 10 --xwayland-display :1 --xwayland-xauthority /run/user/1000/xauth_bUFqhR --xwayland'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007195e88a774c in ?? () from /usr/lib/libc.so.6
[Current thread is 1 (Thread 0x7195e2ec4a40 (LWP 956))]
Function(s) ^std::(move|forward|as_const|(__)?addressof) will be skipped when stepping.
Function(s) ^std::(shared|unique)_ptr<.*>::(get|operator) will be skipped when stepping.
Function(s) ^std::(basic_string|vector|array|deque|(forward_)?list|(unordered_|flat_)?(multi)?(map|set)|span)<.*>::(c?r?(begin|end)|front|back|data|size|empty) will be skipped when stepping.
Function(s) ^std::(basic_string|vector|array|deque|span)<.*>::operator.] will be skipped when stepping.
Cannot QML trace cores :(
/usr/share/drkonqi/gdb/python/gdb_preamble/preamble.py:547: DeprecationWarning: datetime.datetime.utcfromtimestamp() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.fromtimestamp(timestamp, datetime.UTC).
  boot_time = datetime.utcfromtimestamp(psutil.boot_time()).strftime('%Y-%m-%dT%H:%M:%S')
/usr/share/drkonqi/gdb/python/gdb_preamble/preamble.py:564: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
  'timestamp': datetime.utcnow().isoformat(),
[Current thread is 1 (Thread 0x7195e2ec4a40 (LWP 956))]

Thread 15 (Thread 0x7195a6ffd6c0 (LWP 1035)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7195a5dfb6c0 (LWP 1042)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a2024 in ??? () at /usr/lib/libc.so.6
#3  0x00007195e891c5a6 in ppoll () at /usr/lib/libc.so.6
#4  0x00007195e7a4ee04 in ??? () at /usr/lib/libglib-2.0.so.0
#5  0x00007195e7a4eee5 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#6  0x00007195e923c5e2 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#7  0x00007195e8f744b6 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#8  0x00007195e908e054 in QThread::run() () at /usr/lib/libQt6Core.so.6
#9  0x00007195e911ee69 in ??? () at /usr/lib/libQt6Core.so.6
#10 0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#11 0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7195a77fe6c0 (LWP 1033)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7195cedfd6c0 (LWP 1006)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7195a67fc6c0 (LWP 1034)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7195a4ff96c0 (LWP 1036)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7195cddfb6c0 (LWP 1008)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7195a7fff6c0 (LWP 1012)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a2024 in ??? () at /usr/lib/libc.so.6
#3  0x00007195e891c5a6 in ppoll () at /usr/lib/libc.so.6
#4  0x00007195e7a4ee04 in ??? () at /usr/lib/libglib-2.0.so.0
#5  0x00007195e7a4eee5 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#6  0x00007195e923c5e2 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#7  0x00007195e8f744b6 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#8  0x00007195e908e054 in QThread::run() () at /usr/lib/libQt6Core.so.6
#9  0x00007195e911ee69 in ??? () at /usr/lib/libQt6Core.so.6
#10 0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#11 0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7195ce5fc6c0 (LWP 1007)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7195cf5fe6c0 (LWP 1005)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7195e17f06c0 (LWP 1002)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7195cfdff6c0 (LWP 1004)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7195e0e796c0 (LWP 1003)):
#0  0x00007195e88ade22 in ??? () at /usr/lib/libc.so.6
#1  0x00007195e88a1fda in ??? () at /usr/lib/libc.so.6
#2  0x00007195e88a264c in ??? () at /usr/lib/libc.so.6
#3  0x00007195e88a4d1e in pthread_cond_wait () at /usr/lib/libc.so.6
#4  0x00007195d9b5fc5e in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#5  0x00007195d9b1a23d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#6  0x00007195d9b5fb8d in ??? () at /usr/lib/libgallium-25.1.3-arch1.3.so
#7  0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#8  0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7195e29ff6c0 (LWP 990)):
#0  0x00007195e88b669a in malloc () at /usr/lib/libc.so.6
#1  0x00007195e90a0b77 in QArrayData::allocate2(QArrayData**, long long, QArrayData::AllocationOption) () at /usr/lib/libQt6Core.so.6
#2  0x00007195e905bae5 in ??? () at /usr/lib/libQt6Core.so.6
#3  0x00007195e906625d in QString::fromUtf8(QByteArrayView) () at /usr/lib/libQt6Core.so.6
#4  0x00007195ea04adb7 in ??? () at /usr/lib/libQt6DBus.so.6
#5  0x00007195ea026d6b in ??? () at /usr/lib/libQt6DBus.so.6
#6  0x00007195e76ffe41 in dbus_connection_dispatch () at /usr/lib/libdbus-1.so.3
#7  0x00007195ea0462ca in ??? () at /usr/lib/libQt6DBus.so.6
#8  0x00007195e8fd37ef in ??? () at /usr/lib/libQt6Core.so.6
#9  0x00007195e8fddb40 in QSocketNotifier::event(QEvent*) () at /usr/lib/libQt6Core.so.6
#10 0x00007195e8f680c0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt6Core.so.6
#11 0x00007195e923f9f2 in ??? () at /usr/lib/libQt6Core.so.6
#12 0x00007195e7a4d87d in ??? () at /usr/lib/libglib-2.0.so.0
#13 0x00007195e7a4ecd7 in ??? () at /usr/lib/libglib-2.0.so.0
#14 0x00007195e7a4eee5 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#15 0x00007195e923c5e2 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#16 0x00007195e8f744b6 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#17 0x00007195e90873c6 in QThread::exec() () at /usr/lib/libQt6Core.so.6
#18 0x00007195ea01fdae in ??? () at /usr/lib/libQt6DBus.so.6
#19 0x00007195e911ee69 in ??? () at /usr/lib/libQt6Core.so.6
#20 0x00007195e88a57eb in ??? () at /usr/lib/libc.so.6
#21 0x00007195e892918c in ??? () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7195e2ec4a40 (LWP 956)):
[KCrash Handler]
#4  0x00007195ebe8872b in KWin::DrmOutput::cursorLayer() const () at /usr/lib/libkwin.so.6
#5  0x00007195ebb7b120 in ??? () at /usr/lib/libkwin.so.6
#6  0x00007195e8fd37ef in ??? () at /usr/lib/libQt6Core.so.6
#7  0x00007195ebba9ee8 in KWin::Cursors::currentCursorChanged(KWin::Cursor*) () at /usr/lib/libkwin.so.6
#8  0x00007195e8fd37ef in ??? () at /usr/lib/libQt6Core.so.6
#9  0x00007195ebced5cc in ??? () at /usr/lib/libkwin.so.6
#10 0x00007195e8fd37ef in ??? () at /usr/lib/libQt6Core.so.6
#11 0x00007195e8fd37ef in ??? () at /usr/lib/libQt6Core.so.6
#12 0x00007195ebf5a1ee in KWin::SeatInterface::notifyPointerLeave() () at /usr/lib/libkwin.so.6
#13 0x00007195ebc4ec6a in KWin::InputDeviceHandler::update() () at /usr/lib/libkwin.so.6
#14 0x00007195e8fd37ef in ??? () at /usr/lib/libQt6Core.so.6
#15 0x00007195ebc83324 in ??? () at /usr/lib/libkwin.so.6
#16 0x00007195e8fd37ef in ??? () at /usr/lib/libQt6Core.so.6
#17 0x00007195ebdeeccb in KWin::Workspace::outputRemoved(KWin::Output*) () at /usr/lib/libkwin.so.6
#18 0x00007195ebde0811 in KWin::Workspace::updateOutputs(std::optional<QList<KWin::Output*> > const&) () at /usr/lib/libkwin.so.6
#19 0x00007195ebde37da in KWin::Workspace::slotOutputBackendOutputsQueried() () at /usr/lib/libkwin.so.6
#20 0x00007195e8fd37ef in ??? () at /usr/lib/libQt6Core.so.6
#21 0x00007195ebe601c0 in KWin::DrmBackend::updateOutputs() () at /usr/lib/libkwin.so.6
#22 0x00007195ebe61f16 in KWin::DrmBackend::handleUdevEvent() () at /usr/lib/libkwin.so.6
#23 0x00007195e8fd37ef in ??? () at /usr/lib/libQt6Core.so.6
#24 0x00007195e8fddb40 in QSocketNotifier::event(QEvent*) () at /usr/lib/libQt6Core.so.6
#25 0x00007195ea301c70 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt6Widgets.so.6
#26 0x00007195e8f68118 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt6Core.so.6
#27 0x00007195e9126629 in QEventDispatcherUNIXPrivate::activateSocketNotifiers() () at /usr/lib/libQt6Core.so.6
#28 0x00007195e91273c7 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#29 0x00007195e9d1ad33 in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Gui.so.6
#30 0x00007195e8f744b6 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#31 0x00007195e8f6c7c1 in QCoreApplication::exec() () at /usr/lib/libQt6Core.so.6
#32 0x00006289c80c5509 in ??? ()
#33 0x00007195e88376b5 in ??? () at /usr/lib/libc.so.6
#34 0x00007195e8837769 in __libc_start_main () at /usr/lib/libc.so.6
#35 0x00006289c80cbb45 in ??? ()

seth · 2025-06-15 08:46:40

#17 0x00007195ebdeeccb in KWin::Workspace::outputRemoved(KWin::Output*) () at /usr/lib/libkwin.so.6

For KDE and DPM look in the power management settings in systemsettings, nevertheless, the amdgpu kernel module crash (taking down the kernel completely?) seems a pretty severe regression.
The warning isn't new: https://bugzilla.kernel.org/buglist.cgi … _bandwidth but apparently the introductional commit got reverted.
Do you also get it on the LTS kernel?

AstraUrtyp · 2025-06-15 09:55:14

Today I could not recover the session after a source switch even with the LTS-Kernel, but the I was still able to stay connected to the system. So it did not crash completely. Before I checked the power management settings and set turn off screen to `Never`.

After that I removed every USB-Device from the monitor and even a daisy-chained display (I am sorry that I didn't mention this) and it worked like a charm (on LTS and stable) The switch everything. After that I only reconnected the daisy-chained display switched again. The kernel crashed again. So now I found the root of the problem, but I still dont know how to fix it.

Arch Linux

#1 2025-06-14 11:41:43

No signal after switching input source

#2 2025-06-14 14:26:49

Re: No signal after switching input source

#3 2025-06-14 17:00:17

Re: No signal after switching input source

#4 2025-06-14 19:28:51

Re: No signal after switching input source

#5 2025-06-14 19:39:00

Re: No signal after switching input source

#6 2025-06-14 20:29:40

Re: No signal after switching input source

#7 2025-06-14 21:25:21

Re: No signal after switching input source

#8 2025-06-15 08:46:40

Re: No signal after switching input source

#9 2025-06-15 09:55:14

Re: No signal after switching input source

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