On Mon, Dec 02, 2024 at 12:33:48PM +0100, Christoph Biedl wrote:
Alex Deucher wrote... [ back in January ]
Please cherry pick upstream commit b17ef04bf3a4 ("drm/amd/display: Pass pwrseq inst for backlight and ABM") to stable kernel 6.6.x and newer.
This fixes broken backlight adjustment on some AMD platforms with eDP panels.
Hello,
tl;dr: Was it possible to have this in 6.1.y?
after a lenghty bisect session it seems[1] this commit b17ef04bf3a4 ("drm/amd/display: Pass pwrseq inst for backlight and ABM") indeed fixes an issue with a HP mt645[2]: Without it, the backlight stays at full brightness all the time, writing various values to the usual sysfs place has no effect.
That commit was backported to 6.6.y (as 71be0f674070) but not to 6.1.y - which is the series where I'd like to see that issue fixed. However, is does not apply, lot of failed hunks and missing files. So I was wondering whether it had been skipped deliberately because a backport was deemed impossible - or whether it might be doable with some more-than-usual effort. In the latter case, I might be willing to do the task, but quite frankly, lacking any understanding of what the code does, I'd only try to resolve the conflicts and check whether things work.
So I'd be glad if you could give me some insight here: Would it be worth the efforts trying to bring this to 6.1.y?
Why not just move to 6.6.y instead? What's preventing that from happening?
thanks,
greg k-h