Hi,
I'm running a Vega 64 on Linux 5.5.10 with the open source drivers with amdgpu.ppfeaturemask=0xffffffff and a custom SCLK table via /sys/class/drm/card0/device/pp_od_clk_voltage to undervolt the device (which as I'm sure you know can make a significant difference on a Vega card).
That seems to work and according to hwmon the GPU draws less power and is running cooler, just as expected.
However, under some circumstances it switches back to default settings automatically and no changes are accepted anymore.
I think it depends on which monitor is connected, but I'm not 100% sure, maybe someone can give me a hint?
Usually I'm using a 1920x1200@60Hz screen connected via HDMI, but if I switch on my other screen (5120x1440@120Hz via DP) it stops working.
Is this due to the high resolution, or is it because it's activating freesync or is it the refreshrate or DisplayPort in general or something completely different?
If any of this is restricting the usage of undervolting, will that go away in the future?
Regards
I'm running a Vega 64 on Linux 5.5.10 with the open source drivers with amdgpu.ppfeaturemask=0xffffffff and a custom SCLK table via /sys/class/drm/card0/device/pp_od_clk_voltage to undervolt the device (which as I'm sure you know can make a significant difference on a Vega card).
That seems to work and according to hwmon the GPU draws less power and is running cooler, just as expected.
However, under some circumstances it switches back to default settings automatically and no changes are accepted anymore.
I think it depends on which monitor is connected, but I'm not 100% sure, maybe someone can give me a hint?
Usually I'm using a 1920x1200@60Hz screen connected via HDMI, but if I switch on my other screen (5120x1440@120Hz via DP) it stops working.
Is this due to the high resolution, or is it because it's activating freesync or is it the refreshrate or DisplayPort in general or something completely different?
If any of this is restricting the usage of undervolting, will that go away in the future?
Regards
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