Comment 83 for bug 278471

I have same problem (same KDE4 version as above).

My configuration is HP nx7400 + LG 226WTQ. External monitor is connected though D-Sub.

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)

Currently I'm using KDE3 where this configuration works properly.