Comment # 22
on bug 110865
from Dieter Nützel
Hello Alex and Martin, I've tried both on my Polaris 20, RX580 8 GB Sapphire Technology Limited Nitro+ Radeon RX 580 - v2 patched into amd-staging-drm-next (before inclusion of v3) - v3 with amd-staging-drm-next https://cgit.freedesktop.org/~agd5f/linux/commit/?h=amd-staging-drm-next&id=ca82748783d8189a54a85f2ea1c2710182ba6138 Both flicker with green/black (?) horizontally lines over both screens. Mostly during power level switch. For example during mouse movement/interaction (wheel) and mouse pointer traverse from konsole/etc. to desktop (KDE5 Plasma 5.xx, here). UVD load (mplayer etc.) is not enough to fix it. E.g. radv (vkcube) not. But other gfx load (vkmark/glmark2, etc.). When there is lower gfx demand during the above tests (glmark2 -b buffer) the flicker came up, again. Martin's observation [-] If i do "echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level" the flickering stops. So the flickering is caused by the automatic powermanagement / reclocking. [-] Works here, too (tested with v3). But I never could go below ~32 W !!! Tested with both Nitro+ BIOS modes. The PSTATE_xxxx wouldn't change on my card. They stay @ 600/1000 all the time!? GFX Clocks and Power: 300 MHz (MCLK) 300 MHz (SCLK) 600 MHz (PSTATE_SCLK) 1000 MHz (PSTATE_MCLK) 750 mV (VDDGFX) 32.76 W (average GPU) GPU Temperature: 31 C GPU Load: 0 % MEM Load: 3 % Any hints? And sorry for my bad English this time - my best friend from beginning of German Gymnasium died after 6 years of fight against cancer. He aged only 52. Leaving a wife and two little girls...
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