On Wed, 2008-12-31 at 18:31 +0100, Bastian Blank wrote: > tags 510277 moreinfo > thanks > > On Wed, Dec 31, 2008 at 01:04:01AM +0000, Sam Morris wrote: > > When I run my Samsung Q45 laptop on battery power, the screen is dimmed to > > save power. This is fine, except that it is dimmed too much--the screen > > becomes > > so dark that it is basically unusable if there are any external sources of > > light (the sun, or room lighting when it's night time). > > The dimming is not done by the kernel itself. Either ACPI or a userspace > tool is responsible, gnome-power-manager for example.
I just checked and the dimming occurs before I've booted the OS. I found a BIOS option that disables this stupid behaviour. Sorry for the noise! > > The dimming happens in a weird way--it seems to redefine the value of 100% > > brightness, as if I run 'xbacklight --get' while the screen is dark, it > > still > > returns '100'. > > I don't know what xbacklight is, but the kernel controls are exported in > the sysfs as /sys/class/backlight. Please check the contents of this. FYI, xbacklight sets the backlight via the X11 RANDR protocol extension. /sys/class/backlight is empty on this machine. > > Bastian > -- Sam Morris <[email protected]> -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
