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yalilo5046

Member

Registered: 2026-03-08

Posts: 2

Monitor laggy after wake from suspend

Hello,

I have a thinkpad T495 with an AMD gpu.

03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso/Raven 2 [Radeon Vega Series / Radeon Vega Mobile Series] (rev d2)
	Subsystem: Lenovo Device 5125
	Kernel driver in use: amdgpu
	Kernel modules: amdgpu

There's an external monitor attached, with a 2k resolution.

Everything works smoothly, but after wake from suspend, the external monitor is very laggy: you can notice that even scrolling a simple web page is not smooth.

So far I've tried the following, but didn't help:

- udev rule below (from https://news.ycombinator.com/item?id=43081327)

# Generic PCIe fix for sleep bugs by preventing wakeup from any PCIe port
ACTION=="offline", SUBSYSTEM=="pci", DRIVER=="pcieport",     ATTR{power/wakeup}="disabled"

- boot with amdgpu.dcdebugmask=0x10 as kernel parameter

- boot with amdgpu.dpm=0 (hangs on boot)

- boot with amdgpu.runpm=0

- boot with pcie_aspm=off or pcie_aspm=performance

cat /sys/module/pcie_aspm/parameters/policy
[default] performance powersave powersupersave # this always has been default... odd...

- suspend with s2idle instead of deep (s2idle doesn't even reach the suspend state, but hangs directly)

I've also tried to reset the GPU with:

sudo cat /sys/kernel/debug/dri/1/amdgpu_gpu_recover

That fixes the issue, but I have to manually run this after every wake from suspend.

Last edited by yalilo5046 (2026-03-11 09:19:33)

yalilo5046

Member

Registered: 2026-03-08

Posts: 2

Re: Monitor laggy after wake from suspend

Restarting the graphical session also works.

loginctl terminate-session 1

Did not mention that I am currently using Hyprland, however the issue was present in KDE too.

Last edited by yalilo5046 (2026-03-09 11:06:36)