[ltp] X61 Brightness Question

[Henrique de Moraes Holschuh]

On Wed, 15 Aug 2007, Hendrik-Jan Heins wrote:
> > And it certainly wouldn't work right when reading brightness if you used
> > anything but thinkpad-acpi to change it.
> >
> Well, in dmesg it actually says it recognises an X61 and my bios
> revison, so I think that works?

It just means the firmware looks like a thinkpad's :-)  it is there so that
i don't have to ask about it every time I get a debug dump, and because the
driver actually needs that information for bug workaronds and such.

> > > Actually now I do see 0-7 brightness levels in
> > > /sys/class/backlight/thinkpad_screen/actual_brightness
> > > Shouldn't I see more levels?
> >
> > Yes, but I didn't figure out how to detect a 16-level thinkpad yet from the
> > ACPI tables.
> >
> Maybe you shouldn't try to detect it, but set it. Apparently it is
> known how many levels there are for each type of thinkpad?

That would mean an assumption I have to keep chasing after. Yes, I *can* do
it and ask the user to select which mode, and add a blacklist for the few
Lenovo thinkpads that have only 7 levels... but if I can detect it for real,
that would be best.  I just didn't have the time to go after that yet, and
nobody else seems to be trying to.

> Right.. But I cannot get that to work with the kernel modules!

You should be able to with 2.6.22, AFAIK.  Try it in single-user mode, with
no crap loaded but the video module.  Make *sure* HAL and acpid are *not*
running.  Keys should work. Do they?

-- 
  "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