I think I'm having this bug as well in GNOME - Ubuntu 9.04 64-bit & Ubuntu 8.10
32-bit
Hardware is an Acer Aspire 5002wlmi
When I go to System . Preferences > Display only shows one monitor. The
external monitor is not detected at all. When I'm able to boot up with a
clean picture free of messed up colors (usually takes deleting and
regenerating xord.conf) this is what I get for xrandr and lspci:
xrandr only shows one output:
$ xrandr
Screen 0: minimum 320 x 200, current 1280 x 720, maximum 1280 x 800
default connected 1280x720+0+0 0mm x 0mm
1280x800 60.0
1280x768 60.0
1280x720 60.0*
1024x768 75.0 70.0 60.0
1024x576 60.0
960x600 60.0
960x540 60.0
800x600 75.0 72.0 60.0 56.0
768x576 60.0
720x576 60.0
856x480 60.0
848x480 60.0
800x480 60.0
720x480 61.0
640x480 75.0 73.0 60.0
640x400 72.0
512x384 60.0
400x300 60.0
320x240 61.0
320x200 71.0
lspci in working condition (without messed up colors):
01:00.0 VGA compatible controller [0300]: Silicon Integrated Systems [SiS]
661/741/760 PCI/AGP or 662/761Gx PCIE VGA Display Adapter [1039:6330]
Subsystem: Acer Incorporated [ALI] Device [1025:0083]
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Interrupt: pin A routed to IRQ 7
BIST result: 00
Region 0: Memory at e8000000 (32-bit, prefetchable) [size=128M]
Region 1: Memory at e2100000 (32-bit, non-prefetchable) [size=128K]
Region 2: I/O ports at a000 [size=128]
Capabilities: <access denied>
Kernel modules: sisfb
** Attachment added: "Display Preferences - external monitor not supported"
http://launchpadlibrarian.net/25270777/Screenshot-Display%20Preferences.png
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8.10, Laptop: external monitor not supported with SiS card
https://bugs.launchpad.net/bugs/281454
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