Public bug reported:
On my thinkpad a30p running edgy an update about
a week ago stopped the external monitor from working.
This notebook has run hoary, dapper and early versions of edgy without a
problem.
Now, an external monitor, such as a projector or LCD screen will detect
signal from the notebook and even correctly see the resolution and
frequency - but the screen is always black (in X). During boot and in
text consoles, the second display works correctly.
If I boot with the second display attached - both screens end up black
and I cannot switch between either.
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY
(prog-if 00 [VGA])
Subsystem: IBM ThinkPad A30/A30p (2652/2653)
Flags: bus master, stepping, fast Back2Back, 66MHz, medium devsel,
latency 66, IRQ 11
Memory at e0000000 (32-bit, prefetchable) [size=128M]
I/O ports at 2000 [size=256]
Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at c0120000 [disabled] [size=128K]
Capabilities: <access denied>
** Affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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External monitor not working Radeon Mobility M6 LY
https://launchpad.net/bugs/67183
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