On Wed, Sep 24, 2003 at 07:36:33PM +0100, Carlos Sousa wrote: > On Wed, 24 Sep 2003 14:55:06 +0800 Yun-Ta Tsai wrote: > > Greeting, > > I plan to write a script to control my lcd backlight while entering > > power > > saving mode.(Make it darker and after plugging in the AC power, it will > > become brighter.) Is that possible to control the degree of the light of > > LCD? > > I know someone wrote a program for Sony Vaio, is that possible do the same > > stuff on ASUS laptop? > > On my Asus L3C, running kernel 2.4.21 with ACPI patches, there's a file > somewhere under /proc/acpi/ that you can cat a value to (between 0 and 15, > I think), that will enable you to control the LCD backlight intensity.
/proc/acpi/asus/brn here, and .../asus/lcd for backlight on/off status. > I understand kernel 2.4.22 already has the latest ACPI patches included, > but I havent' tried it yet. You need to enable an ASUS-specific option in the kernel configuration to enable this. And insert the corresponding module if you don't compile it in. There's an ACPI patch available against 2.4.22 from http://acpi.sourceforge.net/, though I don't know how much of a difference that makes. Updates to the ASUS ACPI driver can also be found at http://sourceforge.net/projects/acpi4asus. Cheers Robert
