I've experienced the same bug in several releases, including 12.04.
The machine is a Dell Latitude D430
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
Adding the xorg.conf snippet in #24 seems to help, based on the short testing I've done so far.
I've experienced the same bug in several releases, including 12.04.
The machine is a Dell Latitude D430
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
Adding the xorg.conf snippet in #24 seems to help, based on the short testing I've done so far.