Unplayable framerates in game but specific kernel versions work, maybe amdgpu problem

[machion at disroot.org]

Hi,
sorry for the delay.
Besides less time, I had to make myself familiar with bisecting and 
again kernel compiling. Last time I compiled the kernel myself was 
around 2010 I think.

Anyway it seems I found the bad commit. The result after bisecting 10 
commits is:

a53d959fe660341788cb8dbc3ac3330d90a09ecf is the first bad commit
commit a53d959fe660341788cb8dbc3ac3330d90a09ecf
Author: Christian König <christian.koenig at amd.com>
Date:   Thu Mar 20 14:46:18 2025 +0100

     drm/amdgpu: immediately use GTT for new allocations

     commit a755906fb2b8370c43e91ba437ae1b3e228e8b02 upstream.

     Only use GTT as a fallback if we already have a backing store. This
     prevents evictions when an application constantly allocates and 
frees new
     memory.

     Partially fixes
     https://gitlab.freedesktop.org/drm/amd/-/issues/3844#note_2833985.

     Signed-off-by: Christian König <christian.koenig at amd.com>
     Fixes: 216c1282dde3 ("drm/amdgpu: use GTT only as fallback for 
VRAM|GTT")
     Acked-by: Alex Deucher <alexander.deucher at amd.com>
     Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
     Cc: stable at vger.kernel.org
     Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

Marion


Am 2025-05-08 15:18, schrieb Alex Deucher:
> On Thu, May 8, 2025 at 9:13 AM <machion at disroot.org> wrote:
>> 
>> Hello kernel/driver developers,
>> 
>> I hope, with my information it's possible to find a bug/problem in the
>> kernel. Otherwise I am sorry, that I disturbed you.
>> I only use LTS kernels, but I can narrow it down to a hand full of 
>> them,
>> where it works.
>> 
>> The PC: Manjaro Stable/Cinnamon/X11/AMD Ryzen 5 2600/Radeon HD 
>> 7790/8GB
>> RAM
>> I already asked the Manjaro community, but with no luck.
>> 
>> The game: Hellpoint (GOG Linux latest version, Unity3D-Engine v2021),
>> uses vulkan
>> 
>> ---
>> 
>> I came a long road of kernels. I had many versions of 5.4, 5.10, 5.15,
>> 6.1 and 6.6 and and the game was always unplayable, because the frames
>> where around 1fps (performance of PC is not the problem).
>> I asked the mesa and cinnamon team for help in the past, but also with
>> no luck.
>> It never worked, till on 2025-03-29 when I installed 6.12.19 for the
>> first time and it worked!
>> 
>> But it only worked with 6.12.19, 6.12.20 and 6.12.21
>> When I updated to 6.12.25, it was back to unplayable.
> 
> Can you bisect to see what fixed it in 6.12.19 or what broke it in
> 6.12.25?  For example if it was working in 6.12.21 and not working in
> 6.12.25, you can bisect between 6.12.21 and .25.
> 
> Alex
> 
>> 
>> For testing I installed 6.14.4 with the same result. It doesn't work.
>> 
>> I also compared file /proc/config.gz of both kernels (6.12.21 <>
>> 6.14.4), but can't seem to see drastic changes to the graphical part.
>> 
>> I presume it has something to do with amdgpu.
>> 
>> If you need more information, I would be happy to help.
>> 
>> Kind regards,
>> Marion