[arch-general] Now looks like display issue (was: Lock at shutdown with some kernels)

[XeCycle]

Hello,

Last night I thought the bug may have come again, so I decided to
use another way to shutdown.  I think switching to tty1 then
login as root and shutdown will tell me what's wrong maybe, so I
pressed Ctrl-Alt-F1 --- and the system hangs.

So it failed to switch to tty1 and hung, now looks like a display
issue.

I use latest kernel from [core], have a ATI Mobility Radeon 5650
and Intel Core i5 (1st gen) switchable graphics (MUXed) operated
with vgaswitcheroo.  I use xf86-video-{ati,intel} along with
dependencies from [extra], all up-to-date.  Also is xorg.

Can you give me some extra hints on debugging?

-- 
Carl Lei (XeCycle)
Department of Physics, Shanghai Jiao Tong University
OpenPGP public key: 7795E591
Fingerprint: 1FB6 7F1F D45D F681 C845 27F7 8D71 8EC4 7795 E591
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