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This is very strange. Recently I have changed my internet provider and therefore disabled ethernet-dhcp service (I'm using netctl for network configuration) using enp2s0 interface in favour of using USB modem (enp0s20f0u2). As soon as I rebooted the system, one of my 2 screens (connected with an HDMI cable) stopped working. When I re-enabled the service (and rebooted) – the screen is working again. I tried xrandr:
Output with ethernet-dhcp enabled:
$ xrandr
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
1920x1080 60.00*+
1680x1050 59.95
1440x900 59.89
1280x1024 75.02 60.02
1280x960 60.00
1280x720 60.00
1024x768 75.03 70.07 60.00
800x600 75.00 72.19 60.32 56.25
640x480 75.00 72.81 59.94
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 531mm x 299mm
1920x1080 60.00*+
1680x1050 59.95
1440x900 59.89
1280x1024 75.02 60.02
1280x960 60.00
1280x720 60.00
1024x768 75.03 70.07 60.00
800x600 75.00 72.19 60.32 56.25
640x480 75.00 72.81 59.94
HDMI-2 disconnected (normal left inverted right x axis y axis)With ethernet-dhcp disabled it's much less verbose:
$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
1920x1080 0.00*
640x480 0.00 So to my (not that much experienced) eye it looks like some kernel modules (probably ones on which ethernet service depends) might not being loaded. So I compared output of lsmod, but it's almost identical. This is the diff after sorting all entries:
$ diff lsmod-working.srt.txt lsmod.srt.txt
20c20
< drm 581632 7 drm_kms_helper,nvidia_drm
---
> drm 581632 3 drm_kms_helper,nvidia_drm
76,78c76,78
< nvidia 20512768 376 nvidia_modeset
< nvidia_drm 53248 4
< nvidia_modeset 1118208 8 nvidia_drm
---
> nvidia 20512768 1 nvidia_modeset
> nvidia_drm 53248 0
> nvidia_modeset 1118208 1 nvidia_drmThere are some differences in numbers of dependent modules (?) but there is nothing really missing. Also the enp2s0 device is still visible, which would probably not be the case if kernel modules responsible hadn't been loaded.
This is my complete lsmod output when both screens are working:
Module Size Used by
cfg80211 897024 0
rfkill 28672 2 cfg80211
xt_conntrack 16384 4
xt_MASQUERADE 20480 4
nf_conntrack_netlink 57344 0
nfnetlink 16384 2 nf_conntrack_netlink
xfrm_user 45056 1
xfrm_algo 16384 1 xfrm_user
xt_addrtype 16384 2
iptable_filter 16384 1
iptable_nat 16384 1
nf_nat 53248 2 iptable_nat,xt_MASQUERADE
nf_conntrack 172032 4 xt_conntrack,nf_nat,nf_conntrack_netlink,xt_MASQUERADE
nf_defrag_ipv6 24576 1 nf_conntrack
nf_defrag_ipv4 16384 1 nf_conntrack
libcrc32c 16384 2 nf_conntrack,nf_nat
br_netfilter 32768 0
bridge 225280 1 br_netfilter
overlay 139264 0
nvidia_drm 53248 5
nvidia_modeset 1118208 9 nvidia_drm
nvidia 20512768 450 nvidia_modeset
sr_mod 28672 0
cdrom 77824 1 sr_mod
8021q 40960 0
garp 16384 1 8021q
mrp 20480 1 8021q
stp 16384 2 bridge,garp
llc 16384 3 bridge,stp,garp
intel_rapl_msr 20480 0
intel_rapl_common 32768 1 intel_rapl_msr
x86_pkg_temp_thermal 20480 0
intel_powerclamp 20480 0
coretemp 20480 0
kvm_intel 327680 0
kvm 835584 1 kvm_intel
squashfs 69632 5
irqbypass 16384 1 kvm
crct10dif_pclmul 16384 1
crc32_pclmul 16384 0
ghash_clmulni_intel 16384 0
drm_kms_helper 258048 1 nvidia_drm
joydev 28672 0
input_leds 16384 0
mousedev 24576 0
snd_hda_codec_realtek 135168 1
snd_hda_codec_hdmi 73728 1
snd_hda_codec_generic 98304 1 snd_hda_codec_realtek
aesni_intel 368640 0
ledtrig_audio 16384 2 snd_hda_codec_generic,snd_hda_codec_realtek
cec 69632 1 drm_kms_helper
crypto_simd 16384 1 aesni_intel
snd_hda_intel 53248 3
loop 40960 10
nls_iso8859_1 16384 1
nls_cp437 20480 1
cryptd 24576 2 crypto_simd,ghash_clmulni_intel
glue_helper 16384 1 aesni_intel
rc_core 61440 1 cec
iTCO_wdt 16384 0
intel_cstate 16384 0
vfat 24576 1
snd_intel_dspcfg 28672 1 snd_hda_intel
fat 86016 1 vfat
iTCO_vendor_support 16384 1 iTCO_wdt
hid_generic 16384 0
ipmi_devintf 20480 0
r8169 98304 0
snd_hda_codec 167936 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
ppdev 24576 0
mxm_wmi 16384 0
intel_uncore 159744 0
ipmi_msghandler 73728 2 ipmi_devintf,nvidia
psmouse 184320 0
intel_rapl_perf 16384 0
pcspkr 16384 0
snd_virtuoso 61440 0
realtek 24576 0
i2c_i801 36864 0
syscopyarea 16384 1 drm_kms_helper
uas 32768 0
libphy 147456 2 r8169,realtek
cdc_ether 24576 0
snd_hda_core 106496 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
sysfillrect 16384 1 drm_kms_helper
usbnet 53248 1 cdc_ether
mei_me 49152 0
sysimgblt 16384 1 drm_kms_helper
usb_storage 77824 1 uas
mii 16384 1 usbnet
mei 126976 1 mei_me
fb_sys_fops 16384 1 drm_kms_helper
snd_hwdep 16384 1 snd_hda_codec
intel_pch_thermal 16384 0
usbhid 65536 0
hid 143360 2 usbhid,hid_generic
parport_pc 53248 0
parport 61440 2 parport_pc,ppdev
wmi 36864 1 mxm_wmi
evdev 28672 12
mac_hid 16384 0
snd_oxygen 32768 0
snd_oxygen_lib 53248 2 snd_oxygen,snd_virtuoso
snd_mpu401_uart 16384 1 snd_oxygen_lib
snd_rawmidi 45056 1 snd_mpu401_uart
snd_seq_device 16384 1 snd_rawmidi
snd_pcm 147456 5 snd_hda_codec_hdmi,snd_hda_intel,snd_oxygen_lib,snd_hda_codec,snd_hda_core
snd_timer 45056 1 snd_pcm
drm 581632 8 drm_kms_helper,nvidia_drm
snd 114688 20 snd_hda_codec_generic,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_oxygen,snd_hda_intel,snd_oxygen_lib,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_virtuoso,snd_mpu401_uart,snd_pcm,snd_rawmidi
soundcore 16384 1 snd
sg 40960 0
crypto_user 16384 0
agpgart 53248 1 drm
ip_tables 36864 2 iptable_filter,iptable_nat
x_tables 53248 5 xt_conntrack,iptable_filter,xt_addrtype,ip_tables,xt_MASQUERADE
ext4 798720 4
crc32c_generic 16384 0
crc16 16384 1 ext4
mbcache 16384 1 ext4
jbd2 139264 1 ext4
serio_raw 20480 0
atkbd 36864 0
libps2 20480 2 atkbd,psmouse
crc32c_intel 24576 6
xhci_pci 20480 0
xhci_hcd 286720 1 xhci_pci
i8042 32768 0
serio 28672 6 serio_raw,atkbd,psmouse,i8042So it's probably not kernel modules after all, but what else could it be?
Last edited by Sventimir (2020-06-24 10:51:21)
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