Hi have ATI Radeon 4570 card and random white lines come all over the screen. This problem began when i upgraded from Kernel 3.13 on linux mint and no matter what distribution i installed (Kernel 3.16, 3.16, 4.4, 4.9) the problem remained. Finally set radeon.dpm=0 and the problem is gone. Would like to get this resolved. Please let me know which files to attach.
Created attachment 128816 [details] Xorg.0.log
Created attachment 128817 [details] 90-mhwd.conf
Created attachment 128818 [details] dmesg
Please attach your dmesg output with radeon.dpm=1 explicitly set.
Created attachment 128884 [details] explicit dmesg setting with curruption
Created attachment 128885 [details] explicit dmesg without forcing
Created attachment 128886 [details] Without explictly setting dpm and without curruption forced high performance mode
First I Have explicitly set radeon.dpm = 1 which did not solve the problem. Then I have explicitly set radeon.dpm = 1 and forced High performance mode. It did not solve the problem either. Then finally I did not explicitly set radeon.dpm = 1 but it was enabled implicitly and i forced High performance mode and no more currupton. Curruption is gone after forcing high performance mode in dpm or disabling dpm with radeon.dpm = 0 . Please look into this.
Setting it explicitly just adds some additional debugging info in the dmesg output.
Looks like the mclk switching isn't finishing within the vblank period. Do you have the problem with any other display modes or just 1920x1080?
The problem disappears after switching to a lower resolution like 1280x1024 or 800x600 but comes back as soon as i revert to 1920x1080. Please look into this as it seems a large number of previous generation cards are affected by the issue. Lots of people who'll be trying out any new distro on any older computer for basic tasks like web browsing, youtube videos, etc are affected.
Forcing dpm to high performance mode resolves the problem for now.
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