[Bug 373633] [NEW] Virtual desktop size setting disables HW acceleration

[JussiP]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

I run Ubuntu 9/04 on a Macbook with the following graphics card:

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)

By default everything works fine. Then I plug in an external monitor
with resolution 1920x1200. I start the resolution config app and set
external monitor's resolution to 1920x1200. I get a popup saying that I
need to enable virtual desktop size to xorg.conf. I do that and restart
X.

When I log in, xserver has changed to Mesa software rendering. If I go
and remove the virtual size setting from xorg.conf, I get DRI HW
acceleration, but the external monitor's resolution goes to 1024x768.

So I can either get native resolution OR hw accelerated OpenGl. But not
both.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

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Virtual desktop size setting disables HW acceleration
https://bugs.launchpad.net/bugs/373633
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