Desktop effects stopped working on Ubuntu 9.04

[Ori Idan]

Thank you very much.
I had to delete the display section and restart X

-- 
Ori Idan


On Tue, Oct 13, 2009 at 7:37 PM, Ori Berger <linux-il at orib.net> wrote:

> Ori Idan wrote:
>
>> I have an Ubuntu 9.04 laptop with Intel 945 graphics adapter.
>> Desktop effects worked until this morning when I connected it to an
>> external monitor.
>> After disconnecting the external monitor and restarting the laptop,
>> desktop effects stopped working.
>> Does someone have an idea how to reenable them?
>>
> It's a known bug in the Intel driver: You placed the external screen to the
> left/right of the laptop screen, causing the effective screen width to be
> one that the Intel Driver does not support 3D acceleration for, thereby
> causing compiz to turn off effects.
>
> If effects won't turn on, check /etc/X11.conf under section "Screen"
> subsection "Display" to see it doesn't still list a too-wide screen (your
> laptop is probably 1024 or 1280 pixels wide). When this happened to me, I
> deleted the "Display" altogether and let Ubuntu re-figure it out itself, but
> a "sudo dpkg-reconfigure xserver-xorg" might be helpful.
>
> And from now on, when you connect an external monitor, just be sure to
> place the screen above/below the laptop screen rather than to the left/right
> of it.
>
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