Power management on intel i945 video chipset

Marcelo Magno T. Sales mmtsales at gmail.com
Wed Aug 22 12:14:27 UTC 2007


People,

I have a Centrino notebook with intel i945 video chipset and power 
management has been a little of a problem lately.
If I use the xorg i810 driver, I can control LCD brightness correctly 
and I can suspend to RAM, but I can't resume after a suspend. The LCD 
will not turn on again. I had this problem in FC6 and corrected it 
altering the suspend and resume scripts to save the state of LCD 
brightness to a file when suspending and reading it back when 
resuming. In FC6, this information was in /proc/acpi/asus/brn and the 
functions for suspending and resuming were 
in /etc/pm/functions-intel.
In F7, I have the same problem with i810 driver (can't resume after 
suspending, LCD does not turn on), but there's no /proc/acpi/asus/brn 
and I couldn't find the suspend/resume functions.
So I tried the new intel driver. After booting, it allows me to adjust 
LCD brightness as I wish, and it turns on the LCD correctly after 
suspending/resuming. However, once I've done a suspend/resume, the 
LCD brightness is set to maximum and I can't adjust it anymore, 
unless I reboot.
Anyone has this working 100% on a intel i945 video chipset? How did 
you do it?

Thanks,

Marcelo




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