Re: [gpm] Control of generic backlight interface not working

["Rui Tiago Cação Matos" <tiagomatos gmail com>]

2008/11/1 James Whitlock <james whitlock gmail com>:
> I've just upgraded to the latest version of ubuntu and hence upgraded
> gpm to 2.24.0. My acpi extras driver for my laptop (a panasonic cf-t2)
> exports a generic backlight interface and this is recognised by hal
> however Gpm can no longer control my laptop screen brightness.
[snip]
> I've attached a log of gpm verbose output. At line 46, the backlight
> brightness (135) is correctly returned from hal. However it appears as
> though subsequently gpm tries to use xrandr? Any help debugging where
> this is going wrong would be appreciated.

Indeed it seems that backlight brightness control through other means
than xrandr was removed. I've seen the same problem on my Dell laptop.
Are there other people with Latitudes here with experience on this?

I wonder what is the plan to support hardware that doesn't expose this
feature through xrandr but can otherwise set the backlight brightness
in software. I'm sure this change was done with the betterment of the
free desktop architecture in mind but there is a line to draw
somewhere about what constitutes an acceptable regression.

Rui