[Bug 96868] AMDGPU Tonga only does 2560x1440 at 120hz, switching to 144hz causes display errors, same thing used to happen with fglrx.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96868

--- Comment #30 from almoped at gmail.com ---
Testing stable linux 4.12.1 was a mixed bag. 2560x1440p at 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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