Re: Lost hardware acceleration from >=drm-515-kmod for Cherryview and Valleyview i915kms

Hi Alexey and thanks for swift reply!

The lowest working version is 14.1+drm-510. Unfortunately 14.1 is 
unsupported.

I did remove the higher than 14.1 restriction and compiled 510 on 
15.0-p9 with some changes to the source code. I got a green upside down 
plasma login screen and then the GPU_HANGs came. Probably too big a step 
from 14.1 to 15.0-p9. After that I reverted to 14.1 and started 
comparing 510 with 515 but there's alot of changes and the only visible 
log file is from xorg that SIG fails when unloading the modules.

I have also looked at some tunables with 515 as well but to no avail so 
far.

Your reply inspired me to I try a couple of different 14 versions with 
drm-510 and see what happens!

/Roger


Den 2026-06-07 kl. 15:06, skrev Alexey Dokuchaev:
> On Sun, Jun 07, 2026 at 02:42:13PM +0200, Roger Olofsson wrote:
>> Hello everyone!
>>
>> [...]
>>
>> On a 14.1-RELEASE with drm-510-kmod the hardware acceleration works.
>> On same 14.1-RELEASE with drm-515 the hardware acceleration does not
>> work.
> Hello Roger,
>
> This is not surprising: Linux code only regresses with time and higher
> version numbers.  If you must use Linux code (as we all are with DRM)
> my best advice is to stick to the lowest version which works.
>
>> I am aware that 14.1 is an unsupported system but it's the last known
>> RELEASE that is supported by drm-510-kmod. Also drm-510-kmod is about
>> to vanish, it's clinging in ports 2026Q2.
> Nothing prevents you to checkout drm-510-kmod after its removal and keep
> using it during the 14.x timeline.  HTH,
>
> ./danfe