Re: [gpm] [ibm-acpi-devel] T41 Brightness with 2.6.33-rc3-git2

[Robert de Rooy <robert de rooy gmail com>]

On 11/01/10 21:43, Henrique de Moraes Holschuh wrote:
> On Mon, 11 Jan 2010, Robert de Rooy wrote:
>    
> > As to the brightness issue, I still do not get any output when I press
> > the brightness buttons in /dev/input/event10, while I do get output on
> > things like Fn-Space. I enabled the thinkpad_acpi debug options, but
> > that does not seem to make any difference either.
> >      
> Brightness changes get exposed through backlight interface events, not
> through input devices.  Since this is a somewhat new feature of the
> backlight interface, userspace seems not to have caught up to it yet.
>
>    
> > On my T60 where the acpi video driver handles the backlight I do get OSD
> > without needing tpb, but on the T41 where it is handled by
> > thinkpad_acpi, I do not. thinkpad_acpi does report the correct status in
> >      
> Well, I don't know what events the acpi video driver is leaking that
> userspace is keying to.
>
>    
> > sysfs, so this is just a reporting issue, but I thought this was
> > supposed to be fixed with the latest update to thinkpad_acpi?
> >      
> It is, the *proper* events for a non-ACPI backlight interface are all there,
> you can see them using any C program that does poll() or select() in the
> actual_brightness sysfs attribute, or if you use udevadm to see the uevents
> the kernel is issuing.
>
> Which doesn't mean userspace is listening to them, yet.
>
>    

Lets try to add the gnome-power-manager developers to the discussion.

Guys, basically the thinkpad_acpi driver has had some updates in 
2.6.33-rc3 which include improved support for backlight on older thinkpads.

Now on my old ThinkPad T41 pressing the buttons changes backlight, and 
the backlight sysfs entries change, but no OSD from gnome-power-manager
On my newer ThinkPad T60 where backlight is handled by the acpi video 
driver, I do get OSD from gnome-power-manager. So what is 
gnome-power-manager using to keep track of backlight changes?