On Tue, Mar 13, 2012 at 06:56:16PM +0530, Pradeep Subrahmanion wrote:

I tried giving acpi_backlight = vendor . In that case hot key for
brightness control is working. But i think  , it is not calculating the
correct value for brightness because increasing brightness after maximum
level gives blank screen .

Which backlight device appears then?

By ' ACPI interface' , I mean 'acpi_video0' inside the
/sys/class/backlight. I havn't tried the /sys/class/backlight interface
directly . I will try that also.

So writing values into /sys/class/backlight/acpi_video0/brightness does 
nothing?

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