Re: Dual monitor configuration with radeon driver (radeon 9800 (pro))
2010/1/22, Bob Weber <bob@skyeweb.com>:
> 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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>
This works great! Grandr still wont work but xrandr does its job.
Thank you for your help!
--
//Erik Sundin
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