You need this in xorg.conf
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
SubSection "Display"
Virtual 3980 900
endSubSection
EndSection
The virtual line should have 2390 768 from the output of your run of xrandr.
That's assuming you want the displays side by side. You could use larger number
like 2560 1024 and see if you can get both monitors to 1280x1024 (2560=2*1280).
I use 2 identical monitors and I'll never go back. X apparently reserves
memory for the virtual screen so use the smallest numbers that allow both your
screens to fit. I have used two large number like 3980 3980 just to play. You
can then use grandr (gui randr) to play with any combination of locations... up
down or left right.
*...Bob*
On 01/21/2010 04:48 PM, Erik Sundin wrote:
I'm trying to configure two monitors to work with a radeon 9800 (pro) card
using the radeon driver (mostly because fglrx no longer supports this
card...)
Starting up kdm or gdm with no xorg.conf leaves the screen connected to
DVI-0 blank and it remains so after login.
Using grandr doesn't do anything, I get this error:
"""
The program 'grandr' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
(Details: serial 46 error_code 8 request_code 149 minor_code 21)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
"""
When trying to change layout or anything.
xrandr reports the following:
"""
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1366 x 1366
VGA-0 connected 1024x768+0+0 (normal left inverted right x axis y axis)
410mm x 230mm
1366x768 59.8 +
1280x720 75.0 60.0
1152x720 60.0
1024x768 75.0* 60.0
1024x576 60.0
832x624 74.6
800x600 75.0 60.3
640x480 75.0 59.9
720x400 70.1
DVI-0 connected 1024x768+0+0 (normal left inverted right x axis y axis)
338mm x 270mm
1280x1024 60.0 + 75.0 60.0
1152x864 75.0
1024x768 75.0* 60.0
832x624 74.6
800x600 75.0 60.3
640x480 75.0 59.9
720x400 70.1
S-video disconnected (normal left inverted right x axis y axis)
"""
The monitor at VGA-0 is supposed to be run at 1366x768 so i use "xrandr
--output VGA-0 --mode "1366x768"" to make it so;
Imagine my surprise when setting this resolution puts a cloned image
on the DVI-0 output!
so I figure "this might just work" and try "xrandr --output VGA-0
--pos 0x0 --output DVI-0 --right-of VGA-0"
and of course I get:
"""
xrandr: screen cannot be larger than 1366x1366 (desired size 2390x768)
"""
I'm not getting why the screen is limited to 1366x1366 but I'm certain
there is a good reason and I'm definately not getting how I should
proceed with this...
Is there some way to change the "maximum screen size"? or maybe add
another screen? (I never did get the monitor-screen-desktop-display
thingy in Xorg right, sorry)
that is: Screen 0 on VGA-0 and Screen 1 on DVI-0.
pherhaps I should read man pages...
I've also tried with some xorg.conf files found on different sites,
these all lead to X not starting at all. if there is interest I could
provide these and the logs they generated...
//Erik Sundin
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