AMDGPU DC Looks To Have PSR Squared Away - Power-Savings For Newer AMD Laptops

[polarathene]

It is automatic.

You're talking about the regression that was fixed here?:

https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.5-dGPU-Sound-Bind-Power

[amdtesterman]

5.5 seems like will be a great kernel for laptops and even better if you have dGPU as it can be finally powered off when not used. Amazing.

in 5.4 I get no output in sensors for the dGPU, in 5.5 I get these reports and the reports tells me that the dGPU is powered on having a power usage of 7 W... the power usage of the laptop is a litlle bit up, but I think a dGPU is never totallly powered off... at least yet in linux, in windows I think they have this feature, but here.. we are having problems with the battery conmsumption.

[amdtesterman]

It is automatic.

for me it is not true

[Haxk20]

for me it is not true

I just looked and indeed i still see power usage on 5.5. Will create a bug report and we can get this fixed.

[amdtesterman]

I just looked and indeed i still see power usage on 5.5. Will create a bug report and we can get this fixed.

I ll explain myself, my laptop with 5.2 5.3 5.4 has 0,5-1 W lower power usage than in linux 5.5 but when I launched in these kernels the command sensors the output for the dGPU was: N/A in all the sensors when there wasn't any app running with the dGPU. in 5.5 there was a change, the dGPU told me in every moment that it was consuming 7 W, no need to be running any app. But in that kernel the difference of consumption was very little, dGPU is not the cause, I think the dGPU is never powered off.

PD: the ati developpper of this forum told that at least for 5.6 there won't be the possibility of totally power off the dGPU in Linux.
Source:

https://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/open-source-amd-linux/1144685-simplest-way-to-force-amdgpu-to-powersaving-mode