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sibradzic / amdgpu-clocks

Simple script to control power states of amdgpu driven GPUs
GNU General Public License v2.0
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Completed install. Flickering after login. #6

Closed dmbomer closed 4 years ago

dmbomer commented 4 years ago

System setup AMDFX8230 32GB RAM 240GB primary

MSI RX570 8GB Armour DP ports, using DP to HDMI cables 3 monitors setup Benq GW2280

Ubuntu 18.04.3 fresh install Linux deepcool 5.0.0-31-generic #33~18.04.1-Ubuntu SMP Tue Oct 1 10:20:39 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux AMDGPU 19.30 is installed ./amdgpu-install --opencl=legacy

After I set the amdgpu.appfeaturemask in grub, update grub and reboot..Done

GDM3 no longer flickers After I login the screen starts flickering.

After I run sudo amdgpu-clocks in the terminal the flickering stop.

Where am I going wrong here?

sibradzic commented 4 years ago

This is a multi-monitor issue, not related to amdgpu-clocks. See https://www.phoronix.com/scan.php?page=news_item&px=AMDGPU-Multi-Monitor-vRAM-Clock. The way AMD driver (on windows as well?) mitigates the issue is to stick to highest MCLK state all the time, hence increasing the idle power usage. It seems that enabling OverDrive via appfeaturemask somehow overrides static MCLK multi-monitor workaround in amdgpu driver... Setting FORCE_MCLK: 2 in amdgpu-clocks (followed by FORCE_PERF_LEVEL: manual) essentially does the same workaround as above, freezes your MCLK to highest state, so flicker goes away... Since you have 3 identical monitors, you also may try the option described in Phoronix article, and you'll need 5.4+ kernel for that.

dmbomer commented 4 years ago

Hi Samir I don't have windows installed on this system. I will check it out the article Thank you for the information Sir

David

On Thu, Oct 24, 2019 at 11:26 PM Samir Ibradžić notifications@github.com wrote:

This is a multi-monitor issue, not related to amdgpu-clocks. See https://www.phoronix.com/scan.php?page=news_item&px=AMDGPU-Multi-Monitor-vRAM-Clock. The way AMD driver (on windows as well?) mitigates the issue is to stick to highest MCLK state all the time, hence increasing the idle power usage. It seems that enabling OverDrive via appfeaturemask somehow overrides static MCLK multi-monitor workaround in amdgpu driver... Setting FORCE_MCLK: 2 in amdgpu-clocks (followed by FORCE_PERF_LEVEL: manual) essentially does the same workaround as above, freezes your MCLK to highest state, so flicker goes away...

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