From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
Subject: [Bug 38074] Dual head doesn't work for some combination
of monitors (second screen still off)
Date: Tue, 20 Dec 2011 12:05:39 +0000
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https://bugs.freedesktop.org/show_bug.cgi?id=38074
--- Comment #15 from Maarten Maathuis 2011-12-20 04:05:39 PST ---
Out of curiosity, do the lower resolution modes work for DVI?
If you do xrandr --verbose, there should be something like this:
1280x1024 (0x64) 108.0MHz +HSync +VSync *current +preferred
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 64.0KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.0Hz
The 108.0MHz is the bandwith required, please choose a mode well below 150 MHz,
something like 100-125 MHz.
Also, you have to switch to "Scaling mode: None"
This snippet from xrandr --verbose shows the default to be Full, which means
your monitor will always recieve native mode.
scaling mode: Full
supported: None Full Center Full aspect
xrandr --output NAME --set "scaling mode" "None"
This command should do the trick if you fill in the right output name, but be
sure to check that the setting is indeed changed.
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