[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 #5 from Alex Deucher <alexdeucher at gmail.com> ---
Created attachment 147331
  --> https://bugzilla.kernel.org/attachment.cgi?id=147331&action=edit
possible fix

As you can see from your log, the vblank time for the mode you've selected is
right at the mclk switching limit:
[    5.943137] vblank_time 450, switch_limit 450
so I guess in your case, there are times when it doesn't quite complete in
time.  A minor adjustment to the comparison should fix it.

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