https://bugzilla.kernel.org/show_bug.cgi?id=18872

Maté mate.taixi@gmail.com changed:

What |Removed |Added ---------------------------------------------------------------------------- CC| |mate.taixi@gmail.com

--- Comment #11 from Maté mate.taixi@gmail.com 2011-05-23 21:10:09 --- Same problem with vanilla 2.6.39 on debian testing.

"At the STR process the backlight goes off shortly but remains lit during suspend. The screen goes black and stays black when out of suspend. Some flickering on/off when entering and leaving STR. There's short harddrive activity when coming out of suspend [1]. Also, suspend- and power-led blink/lit as they are supposed to. The box is then locked up, not reacting to keyboard input or even sysrq. Hard power off required."

[1] not sure about this one

There's a switch in /etc/default/acpi-support: #RADEON_LIGHT=true

Commented or uncommented doesn't change the behavior during STR.