Re: T41 Brightness with 2.6.33-rc3-git2

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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.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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