Created attachment 121103 [details] Screenshot of failure Sometimes after the deactivation of the screensaver or also on bootup the screen shows flickering noise and a duplicated screen image. (Attached there is the used test image and a screenshot of the failure image). We tested on various kernel versions, latest kernel tested was 4.4.0. We run a customized debian image. Further investigations showed, that in the failure scenario the measured clk frequency was only 25MHz but it should be 35MHz. We also tried to deactivate dpms completly (radeon.dpm=0 in kernel parameters) and also turned the dpms off in the screensaver, but we still sometimes encounter the problem after a reboot. Attached you will find a dmesg output with drm.debug=0xf activated. We use a Radeon PALM on a AMD G-T40E 2x1GHz
Created attachment 121104 [details] original test image
Created attachment 121105 [details] dmesg output of startup in case of failure
Created attachment 121106 [details] Screenshot of failure
Created attachment 121107 [details] original test image
What mode are you trying to set? Please attach your xorg log and and config (if you have one) and the xrandr --verbose output.
DPM has nothing to do with the display clocks or dpms. It's engine clock management. Also which display are you having problems with, VGA or LVDS?
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