[Bug 44755] Garbled display on external screen when using 1920x1080 instead of 1920x1200

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=44755

--- Comment #4 from Alex Deucher <agd5f at yahoo.com> 2012-01-13 08:25:54 PST ---
The problem is the modeline from your monitor for the 1920x1080 mode is greater
than 165 Mhz which is the current cut off for single link mode in the driver:
(II) RADEON(0): Modeline "1920x1080"x60.0  172.78  1920 2040 2248 2576  1080
1081 1084 1118 -hsync +vsync (67.1 kHz)

It should work if you specify a modeline with a lower clock  E.g.,
Modeline "1920x1080R"  138.50  1920 1968 2000 2080  1080 1083 1088 1111 +hsync
-vsync

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