Bug#442907: xserver-xorg-video-mga: Multihead doesn't work on G450

["Jarmo Ilonen" <trewas@gmail.com>]

On 18/09/2007, Brice Goglin <Brice.Goglin@ens-lyon.org> wrote:
> Please send the whole output of 'xrandr' after reinstalling 1.9.99 so
> that we see all available modes for each output. You can change the mode
> of output FOO with something like
>     xrandr --output FOO --mode 1024x768 --rate 75

Here's the output of xrandr:

Screen 0: minimum 320 x 200, current 1440 x 960, maximum 1600 x 1024
DVI connected 1440x900+0+0 306mm x 230mm
   1600x1024      60.0
   1280x1024      60.0     60.1
   1440x900       60.2*
   1280x960       60.0
   1280x800       60.0
   1280x768       60.0
   1024x768       60.0
   800x600        60.3
   640x480        60.0     59.9
VGA connected 1280x960+0+0 408mm x 306mm
   1280x1024      75.0     59.9
   1280x960       59.9*
   1152x864       75.0     74.8
   1024x768       75.1     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   640x480        75.0     72.8     66.7     60.0
   720x400        70.1

"DVI" (actually connected with a VGA-adapter) is an old crappy CRT, I
have been running it in 1024x768 normally. "VGA" is a new 20" LCD
(Samsung 204b) with 1600x1200 native resolution.

Changing the resolution of "DVI" to anything else caused the monitor
to go blank, sounded like the monitor shut itself physically down to
protect itself or something. Further changes did not produce a
picture, but the monitor again made some noises so the xrandr commands
did at least something. Changing the resolution of "VGA" worked fine,
but the 1600x1200 resolution was not an allowed resolution (I don't
remember the actual message).

Looking at the xorg logs there seems to be some confusion about the outputs:
(II) MGA(0): Output DVI using monitor section Samsung 204b
(II) MGA(0): Output VGA has no monitor section
but the physical sizes reported by the xrandr command above match the reality.

By the way, does this
http://lists.freedesktop.org/archives/xorg/2007-September/027857.html
also apply to mga driver? I have been using two monitors as two
separate X screens as xinerama is IMO not really an option unless the
monitors are nearly similar, which really is not the case here.

Anyway, this is actually a computer at work so I cannot waste too much
time debugging, but if there are some specific things to test I can
try to find some time...