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

[Jarmo Ilonen]

On 18/09/2007, Brice Goglin [EMAIL PROTECTED] 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
   800x60060.3
   640x48060.0 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
   832x62474.6
   800x60072.2 75.0 60.3 56.2
   640x48075.0 72.8 66.7 60.0
   720x40070.1

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...



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

[Jarmo Ilonen]

I noticed the same problem with Matrox G550 and driver
xserver-xorg-video-mga 1:1.4.7.dfsg.1-3, only the first monitor works
while Xorg.0.log does not report any problems about the second.

Trying with the driver version from the experimental
(1:1.9.99.dfsg.1-1) with the same config gives some kind of clone mode
with weird resolutions for two monitors with several graphical
glitches.  I tried to change the config with grandr but it did not
give any other choice than the clone mode, but this might be fault of
grandr and not the driver. The man-page of xrandr does not look very
inviting so I did not yet try changing the settings with it, and
instead downgraded the driver and some other xorg packages to the
versions in testing to get a working set up.

Are these newer drivers likely to get fixed anytime soon or is the
medium term solution to stay with 1.4.6 driver? I am personally not
very motivated to try to fix or hunt for bugs in the experimental mga
driver (good reason to get rid of the POS matrox if anything), and
maybe nobody else is either for such old cards...



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