Comment # 30
on bug 96868
from almoped@gmail.com
Testing stable linux 4.12.1 was a mixed bag. 2560x1440p@143.9Hz no longer flickers or causes display corruption, but graphics memory run at full speed and card heats up. It would seem any refresh rate above 60Hz; i.e. 100, 120 and 144 all made the memory run full speed. Testing DAL-wip with linux 4.9.0 show 144Hz and 143.9Hz display a nearly perfect picture. There is display corruption on the last ~80 pixels of the second last row of the picture. (Current win10 drivers have the same corruption) But this was all with MCLK at the lowest state, 150MHz. Back on linux 4.12.1, editing amdgpu to test disable_mclk_switching=0 and setting 143.9Hz everything seems fine: no corruption anywhere, card at 150MHz and less heat generated. It would seem something, not related to mclk, has been fixed since I reported this bug for linux 4.6.3. Setting 144Hz, as KDE allows, still causes massive flicker and corruption. Selecting 143.9Hz results in a stable picture, with no corruption and similar to what fglrx used to display.
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