Laptop backlight does not turn off
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
acpi-support (Ubuntu) |
Fix Released
|
Medium
|
Unassigned |
Bug Description
On my laptop, the backlight never turns off unless the lid is closed (appears to
be a hardware switch, cutting the power to the display).
xset -q reports Acpi working and returns the monitor state correctly (also when
supposedly off).
xset dpms force off blanks the screen, but the backlight stays on. The same
goes for vbetool.
DPMS is enabled in xorg.conf and reported loaded succesfully in xorg.log.
As far as I can tell, the issue is somewhere in the kernel ACPI drivers. There
are a number of people reporting this on several different machines with both
ATI and Nvidia cards (maybe others).
most files in /proc/acpi/
My laptop is a HP Pavilion zv5474EA with an Nvidia card (Nvidia drivers). It is
running an up-to-date Hoary.
This seems a related problem (On a Toshiba): bugme.osdl. org/show_ bug.cgi? id=1944
http://