I can confirm this bug. I have the exact same behavior on my Intel GM965:
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c) Subsystem: Lenovo Device 20b5 Flags: bus master, fast devsel, latency 0, IRQ 28 Memory at f8000000 (64-bit, non-prefetchable) [size=1M] Memory at e0000000 (64-bit, prefetchable) [size=256M] I/O ports at 1800 [size=8] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915
It seems only to appear on some windows though. For example, Update Manager windows can be resized without any artefacts...
I can confirm this bug. I have the exact same behavior on my Intel GM965:
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
Capabilities: <access denied>
Subsystem: Lenovo Device 20b5
Flags: bus master, fast devsel, latency 0, IRQ 28
Memory at f8000000 (64-bit, non-prefetchable) [size=1M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 1800 [size=8]
Kernel driver in use: i915
Kernel modules: i915
It seems only to appear on some windows though. For example, Update Manager windows can be resized without any artefacts...