Dear Maintainer,

I have a laptop equipped with an AMD Ryzen 5 3500U using integrated graphics.
After installing the latest kernel from Testing (7.1.7+deb14-amd64) I noticed a
problem while using it.
At first it was minor glitches of about 5% of the screen being replaced with
random blocky colours for just long enough to be noticed but would disappear
before it impacted anything.

Recently it spiked to 75% of the screen with multiple flashes in short
succession. I checked btop and it reported high CPU usage but low load average.
So it seems as though a lack of available CPU impacts this bug.

I would normally figure out this problem myself but I couldn't find any helpful
information besides bug #1093084.

Under normal conditions my screen doesn't have this issue, and I haven't
touched the internal cable connecting to the monitor.


For more information here is the setup I have:

Laptop Brand- Lenovo
Model- ThinkPad E595
Integrated GPU (According to lspci)- VGA compatible controller: Advanced Micro
Devices, Inc. [AMD/ATI] Picasso/Raven 2 [Radeon Vega Series / Radeon Vega
Mobile Series] (rev c2)

Information I got during the latest episode:
Reported load average- ~4-5 (CPU runs on 8 threads total)
Reported CPU usage- 100%
Memory usage- 47%
Swap usage- 39%
VRAM usage- ~48% (2GB is allocated for use)


I hope this is helpful. Thank you for all of the work you do!

Greetings.

Replying as an user – I am not a member of the Debian kernel team:

Homer Haddock - 12.08.26, 20:14:37 CEST:

I saw something similar with vanilla 7.1.7 kernel – self-compiled – on my
ThinkPad T14 AMD Gen 5 with integrated AMD Radeon 780M GPU. I did not see
the 75% case, but under usual workloads the CPU is not fully utilized on
this system.

It went away with vanilla 7.1.8. Can you try with 7.1.8 once the Debian
kernel image for that becomes available?

I use firmware-amd-graphics 20260622-1 package.

Best,

Hello.

I will upgrade to the newest kernel image the ASAP and will update you about the results.

I also checked the firmware version than I installed, 20260622-1 is currently installed.

Kind regards,
-Homer Haddock

Hello again,

I installed linux-image version 7.2~rc7-1~exp1 and required packages from deb.debian.org. It solved the issue for me.

So between the v7.1.8 and now there was a fix added to the GPU firmware.

I'll update when images move to testing to see when it would be fixed for others.

Hope this helps others,
-Homer Haddock