<div dir="ltr">Thank you very much.<br>I had to delete the display section and restart X<br><br>-- <br>Ori Idan<br><br><br><div class="gmail_quote">On Tue, Oct 13, 2009 at 7:37 PM, Ori Berger <span dir="ltr"><<a href="mailto:linux-il@orib.net">linux-il@orib.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="h5">Ori Idan wrote:<br>
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I have an Ubuntu 9.04 laptop with Intel 945 graphics adapter.<br>
Desktop effects worked until this morning when I connected it to an external monitor.<br>
After disconnecting the external monitor and restarting the laptop, desktop effects stopped working.<br>
Does someone have an idea how to reenable them?<br>
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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.<br>
<br>
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.<br>
<br>
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.<br>
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