Arch Linux

860lacov

Member

Registered: 2020-05-02

Posts: 497

[SOLVED] After system upgrade KDE Plasma freeze after login

Packages upgraded:

https://0x0.st/Pco4.txt

System:
Lenovo ThinkPad P14s Gen 4 AMD
Ryzen 7 7840U, AMD 780M (amdgpu)
Arch Linux
Kernel: linux (same issue on LTS kernel)
DE: KDE Plasma 6
Session: Wayland
Bootloader: systemd-boot

Problem:
After a recent pacman -Syu the system started freezing shortly after login.
The screen freezes completely (mouse and keyboard unresponsive).

Pressing Ctrl+Alt and quickly switching virtual terminals (F1 → F12)
temporarily unfreezes the system for about 1–2 seconds.
I can move a mouse or open file browser.
After that, it freezes again.

This can be repeated indefinitely.

What works / what does not:
- The system boots and login works.
- VT switching temporarily restores responsiveness.
- linux-lts does NOT fix the issue.
- amdgpu.psr=0 allows the system to boot reliably, but does NOT fix the freezes.
- amdgpu.dc=0 results in a black screen on this laptop.
Above two are tips from chat gpt.

Journal:
I was able to find for example:

- kwin_wayland: Applying output configuration failed
- powerdevil: Failed to find connector name

Last edited by 860lacov (2026-02-06 05:41:49)

akai

Member

Registered: 2026-01-11

Posts: 19

Re: [SOLVED] After system upgrade KDE Plasma freeze after login

Check if this works  https://bbs.archlinux.org/viewtopic.php?id=304797

Last edited by akai (2026-02-04 18:53:01)

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聞くは一時の恥聞かぬは一生の恥 o

5hridhyan

Member

From: Asia

Registered: 2025-12-25

Posts: 304

Re: [SOLVED] After system upgrade KDE Plasma freeze after login

and yeah this is bad to suggest anything before journal logs for proper trouble shooting but I do have hunch

amdgpu.psr=0 amdgpu.dcdebugmask=0x10

try this if this fails then switch to VT3 then stop this

systemctl --user stop plasma-powerdevil

and then switch back and if this works, the problem should be the ddcutil update.

and If the above don't work, you may need to roll back the ROCm and ddcutil updates, atleast that is what I suspect from your "package upgraded" logs.
for sanity check what about in x11, if x11 also freezes like that then downgrading ROCm stacks might make sense.

edit:
removed "journalctl -b -1| curl -F file=@- 0x0.st" as journal logs were provided already.

Last edited by 5hridhyan (2026-02-04 19:19:36)

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I expect some mercy from my fellow humans! ^^
Keep your virtue sharpened in a kingdom of carrion, and the throne they offer will be built from your ribs.

860lacov

Member

Registered: 2020-05-02

Posts: 497

Re: [SOLVED] After system upgrade KDE Plasma freeze after login

Check if this works  https://bbs.archlinux.org/viewtopic.php?id=304797

After freez I rebooted my laptop and did:
Journalctl -b -1
https://0x0.st/PcHk.txt

860lacov

Member

Registered: 2020-05-02

Posts: 497

Re: [SOLVED] After system upgrade KDE Plasma freeze after login

Check if this works  https://bbs.archlinux.org/viewtopic.php?id=304797

After freez I rebooted my laptop and did:
Journalctl -b -1
https://0x0.st/PcHk.txt

That helped.
I'm not able to fix this myself, so I have to wait for a system upgrade right?

Last edited by 860lacov (2026-02-04 19:39:52)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,064

Re: [SOLVED] After system upgrade KDE Plasma freeze after login

possibly: https://bbs.archlinux.org/viewtopic.php?id=312019 , might want to try that.

IcePik

Member

From: Canterbury, UK

Registered: 2008-12-14

Posts: 33

Re: [SOLVED] After system upgrade KDE Plasma freeze after login

possibly: https://bbs.archlinux.org/viewtopic.php?id=312019 , might want to try that.

Thanks, the ddcutil package downgrade fixed the issue for me.

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IcePik