Created attachment 79751 [details] dmesg from machine with two cards. I have a laptop with two ati cards: Mobility Radeon HD 6620G Radeon HD 6400M Enabled powersave mode on both cards: #echo dynpm > /sys/class/drm/card0/device/power_method #echo dynpm > /sys/class/drm/card1/device/power_method Clock speed on the first card reduced almost immediatly: #cat /sys/kernel/debug/dri/0/radeon_pm_info default engine clock: 200000 kHz current engine clock: 7990 kHz default memory clock: 667000 kHz But second card don't react at all: #cat /sys/kernel/debug/dri/1/radeon_pm_info default engine clock: 800000 kHz current engine clock: 799940 kHz default memory clock: 800000 kHz current memory clock: 799870 kHz voltage: 900 mV
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