On 3/17/25 00:09, Bert Karwatzki wrote: > This is related to the admgpu.gttsize. My laptop has the maximum amount > of memory (64G) and usually gttsize is half of main memory size. I just > tested with cmdline="nokaslr amdgpi.gttsize=2048" and the problem does > not occur. So I did some more testing with varying gttsize and got this > for the built-in GPU > > 08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] > Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev c5) > > (nokaslr is always enabeld) > gttssize input behaviour > 2048 GOOD > 2064 GOOD > 2080 SEMIBAD (i.e. noticeable input lag but not as bad as below) > 3072 BAD > 4096 BAD > 8192 BAD > 16384 BAD > > As the build-in GPU has ~512 VRAM there seems to be problems when gttsize > > 4*VRAM so I tested for the discrete GPU with 8G of VRAM > gttsize input behaviour > 49152 GOOD > 64000 GOOD > > So for the discrete GPU increasing gttsize does no reproduce the bug. > Very interesting, I am not a GTT expert, but with these experiments do you find anything interesting in /sys/kernel/debug/x86/pat_memtype_list? It's weird that you don't see any issues in Xorg (Xfce), just the games. May be we should get help from the amd-gfx experts to further diagnose/debug the interaction of nokaslr with the game. Balbir
