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

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

--- Comment #12 from Alex Deucher <alexdeucher@xxxxxxxxx> ---
I'm not sure what's going on.  Maybe a gcc bug?  Can you try a modeline with a
longer vblank period?  E.g.,

xrandr --newmode 1600x1200_gtf  234.76  1600 1720 1896 2192  1200 1201 1204
1260  -HSync +Vsync
xrandr --addmode DVI-0 1600x1200_gtf
xrandr --output DVI-0 --mode 1600x1200_gtf

or
xrandr --newmode 1600x1200_cvt 235.00  1600 1728 1896 2192  1200 1203 1207 1262
-hsync +vsync
xrandr --addmode DVI-0 1600x1200_cvt
xrandr --output DVI-0 --mode 1600x1200_cvt

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