Created attachment 38422 [details]
dmesg | grep drm after the black screen

If I
- try to suspend my laptop, or
- try to log off some user, or
- try to switch to a virtual console,
the screen becomes black and nothing is able to turn it on again. The system however remains alive (I'm able to connect via network).

This seems like a regression, since if I use the kernel 2.6.32-3-amd64 in Debian, I'm able to suspend, while if I use 2.6.32-5-amd64 or 2.6.35-trunk I get this problem.

Some more information can be found at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=587722 , but the majority of it should be not particularly useful.

lspci -v says:

01:05.0 VGA compatible controller: ATI Technologies Inc RS780M/RS780MN [Radeon HD 3200 Graphics] (prog-if 00 [VGA controller])
        Subsystem: Hewlett-Packard Company Device 30f1
        Flags: bus master, fast devsel, latency 0, IRQ 18
        Memory at c0000000 (32-bit, prefetchable) [size=256M]
        I/O ports at 5000 [size=256]
        Memory at d2400000 (32-bit, non-prefetchable) [size=64K]
        Memory at d2300000 (32-bit, non-prefetchable) [size=1M]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: radeon

(but notice, in case that changes anything, that this comes out while running 2.6.32-5) and the `dmesg | drm` and the Xorg.0.log (both obtained instead running 2.6.35-trunk) are attached. I guess the latter is more interesting, so it is attached in two forms:
- one taken after starting the system, waiting for the gdm prompt and then switching to a virtual console
- one taken after starting the system, logging an user and then logging out.

Notice that the last lines (of both) are printed several seconds after the operation that causes the black screen. Instead, in the "logout" log, the lines

(II) Power Button: Close

and following are printed at the moment of the logout.