[Bug 38074] Dual head doesn't work for some combination of monitors (second screen still off)

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38074

--- Comment #15 from Maarten Maathuis <madman2003-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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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