Re: I have some problems with acpi on my laptops:

On Thu, Sep 29, 2011 at 10:13:59PM +0000, Silvio Caggia wrote:

if I run acpitool -s it suspends correctly, but when I press power on all 
the laptop awakes except video display.
So the screen is black, if I press caps-lock the led works, if I press 
ctrl-alt-F1 and then ctrl-C I am still able to (blindly) type reboot...
It seems that the video adapter is not able to awake.

Sounds like a bug with the radeon driver. Are you using kernel 
modesetting?

powersave governor with a fixed 222Mhz speed, so slow that the system is 
not usable.
the cpu is a Celeron
note: on the first laptop, a Compaq Evo N800v, driver acpi-cpufreq works 
fine with ondemand governor, driver p4-clockmod have same problems.
How to activate a working driver with ondemand governor?

Older Celerons didn't support speedstep. There's no way to use ondemand 
with them.

-- 
Matthew Garrett | mjg59@srcf.ucam.org