[Bug 82781] Option to disable mclk reclocking with AMD R9 280X (TAHITI) to avoid screen flickering on VGA/CRT

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=82781

--- Comment #6 from Alex Deucher <alexdeucher at gmail.com> ---
Since you seem to be using a custom edid, you can also adjust the modelines to
increase (to give the GPU more time to switch the mclk) or decrease (to disable
mclk switching) the vblank_time. I suspect the vblank period is not reliable on
you monitor and since it's currently set to exactly the switching limit  the
margin for error is very small.  The switch may not have finished completely
during the vblank period if the vblank period happens to be shorter in some
cases.  That's why you see the flickering.  Tweaking your modeline to increase
the vblank period should avoid that.

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