Ubuntu
xserver-xorg-video-ati package

Dual monitor setup fails to work after upgrade to 10.10

Asked by Chris

Video Card: ATI Radion 5450 using the fglrx driver

I've had 10.4 working for sometime with a virtual resolution of 2560x1024 (2 monitors). After upgrade to 10.10 this has completely stopped working I get a message "X server does not support size requested" and I'm dropped to a cloned display. My Xorg.conf file is identical to the one I had before (even after letting it reconfigure it)

I've tried reinstalling the driver to no avail.

I was able to use the "radion" driver and get multi-display to work but it only support 1024x768 for my screens and I need 3D acceleration as well so it's not really a solution

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Sam_ (and-sam) said : 		#1

> "X server does not support size requested"

I'd ask xrandr what is actually supported.
This may help.
https://help.ubuntu.com/community/XineramaHowTo
https://wiki.ubuntu.com/X/Config/Resolution

Make sure the driver is correctly installed.
https://help.ubuntu.com/community/BinaryDriverHowto/ATI

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Chris (cfreak-gmail) said : 		#2

Sam_ thanks for the help.

Driver is definitely working. I get 3D acceleration. Again this was all working perfectly on the same hardware before the upgrade.

xrandr -q says the maximum size is 1440x1440 ... but in xorg.conf I have this line in the Screen section ( Subsection Display):

Virtual 2560 1024

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Chris (cfreak-gmail) said : 		#3

I was finally able to solve this by using the aticonfig tool. Then I enabled Xinerama. It's not as ideal as the setup I had before as Xinerama disables xrandr support but at least I have the effect I wanted