Bug 108015

After enabling the overclocking by adding amdgpu.ppfeaturemask=0xffffffff kernel boot parameter I noticed that my GPU works very slow. I noticed by reading /sys/kernel/debug/dri/1/amdgpu_pm_info that the card fails to go to higher power states.

Here are the screenshots and the way I found to temporarily fix it. I am using Witcher 3 on Steam Proton 3.7.6 as a performance measurement:

https://i.imgur.com/HI6iakk.jpg
1). Initial state. The game is running around 15-20 frames. The pp_od_clk_voltage table seems correct but the power consumption stays around 15 Watts and the clock is stuck at 300 MHz


https://i.imgur.com/LInHonF.jpg
2). Trying to reset it straight away is not helping.


https://i.imgur.com/klkGSoA.jpg
3). Writing a value in to that is already on the table of pp_od_clk_voltage is also not helping.


https://i.imgur.com/BH8ZwIr.jpg
4). Setting a value slightly different than will actually allow the GPU to change its power state to a higher level. However, it is still not fully powered as it would be  without overclocking enabled. The frame rate is only 20-30 and the power is around 80 Watts.


https://i.imgur.com/x1Mipja.jpg
5). Resetting the values now will fully enable the card. Frame rate goes to 100 frames per second and power consumption to 100 Watts.

Here are more information that might be useful:

GPU: Sapphire AMD RX480 Nitro
Kernel: 4.18 ZEN

Thank you for your work on the AMDGPU driver.