Ubuntu
compiz package

Compiz stops to work after external monitor configuration

Asked by lugburz

I used gnome-display-properties to enable an external monitor attached to my laptop. To to this the application add in the xorg.conf this screen configuration:

Section "Screen"
 Identifier "Configured Screen Device"
 Device "Configured Video Device"
 SubSection "Display"
  Virtual 2640 800
 EndSubSection
EndSection

after that compiz stopped to work, also with a single display attached. is this ok?

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Andrew Gee (andrewgee) said : 		#1

lugburz,

Could you tell me what make of graphics adapter you have in your system? ATI, Nvidia, Intel?

Thanks

Andrew Gee

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lugburz (lugburz) said : 		#2

I have an Intel 945GM card, automatically regonized by the xserver.

If I remove Display subsection into the xorg.conf the compiz effect come back.

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Andrew Gee (andrewgee) said : 		#3

lugburz,

I used to have a similar problem with my ATI graphics adapter. I found that the resolution was too high for compiz to run. See if this is the problem, in your situation, by reducing the resolution of both monitors for a short time.

Good Luck.

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lugburz (lugburz) said : 		#4

I got, do you know if there "official" limits published some where? or did you test randomly.

Thanks, cross finger

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Andrew Gee (andrewgee) said : 		#5

The limit was part of the ATI hardware in this case. I'm not sure where you'd find the limits for intel hardware.

I just tested randomly to start with :)

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lugburz (lugburz) said : 		#6

In the Xorg.0.log file I found an explicit line that clain a limit of "2048" to leave on the DRI.

I solved placing the second monitor above the first one. This leave the DRI enabled and compiz works.