[REGRESSION][BISECTED] 58a261bfc967: choppy GPU performance

[Leo Li]

On 2024-10-01 15:10, Mario Limonciello wrote:
> On 10/1/2024 14:09, John Rowley wrote:
>> I was using power-profiles-daemon version 0.23 in balanced mode.
>>
>> I also tested TLP, and vanilla kernel without any power daemons running. 
>> Without any daemons I use the following:
>>
>>      energy_performance_preference: balance_power
>>
>>      scaling_driver: amd-pstate-epp
>>
>>      scaling_governor: powersave
>>
> 
> Thanks as long as it can reproduce in 'balanced' mode that should exclude PPD 
> from being the cause and it most likely a pure kernel bug.
>  

I'm curious if you have a PSR supported panel. Does setting
amdgpu.dcdebugmask=0x10 on your kernel cmdline help? This force disables PSR.

Another flag to try is amdgpu.dcdebugmask=0x800, which allows PSR but disables
idle power optimizations. I wonder if that may be causing extra latency.

- Leo