Same problem here, I am using Ubuntu 11.04 64 bit with an Intel chipset.
$ sudo lspci -s 00:02.0 -kvnn
00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if
00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. Device [1043:1652]
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at ddc00000 (64-bit, non-prefetchable) [size=4M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
I/O ports at e000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Kernel modules: i915
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Expired => Confirmed
** Changed in: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/573312
Title:
Wrong resolution in GDM when using external monitor connected to
laptop - Intel chipset
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