Re: brightness_mode report on a ThinkPad R50e

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On Sat, 14 Nov 2009, Ferenc Wagner wrote:
> Henrique de Moraes Holschuh <hmh@xxxxxxxxxx> writes:
> > On Sat, 14 Nov 2009, Ferenc Wagner wrote:
> >> thinkpad_acpi: ThinkPad BIOS 1WET90WW (2.10 ), EC 1VHT28WW-1.04
> >> thinkpad_acpi: IBM ThinkPad R50e, model 1834S5G
> >
> > ...
> >
> >> Actually, this is the only mode that does NOT work; both 1 and 3 work
> >> instead.  Hope it's useful.

Well, I am surprised.   You have an Intel embedded GPU, and the R50e would
be the very first ThinkPad I've ever heard about that does EC control of
backlight brightness with Intel Graphics.

I will have to ask you to do some extra testing, to make sure there is
nothing in userspace falsifying your test results.

Please go to single user text mode, and stop udev.  At that point, you
should have only kernel threads, init, su/sulogin/bash running, which you
can verify using "ps auxwww".

unload and reload thinkpad-acpi with the various brightness_mode
possibilites, and check if you can correctly read and set display brightness
through /proc/acpi/ibm/brightness.

Does that test confirm that modes 1 and 3 work on the R50e, and mode 2 does
not work on the R50e ?

> > Also, while we're at it, I'd appreciate if you could send me by private
> > email the full output of acpidump, and the output of dmidecode (please mask
> > out any serial numbers and UUIDs).
> 
> No problem.  I'm somewhat surprised that the current output of acpidump
> differs from what's attached to
> http://bugs.freedesktop.org/show_bug.cgi?id=22126, does that depend on
> the time of the boot, or what?

Thank you for the data dump.

The two acpidumps show that you did a BIOS update, from version 2.00 to
2.10, you probably forgot that detail :-)

> > If you feel it would be useful to have the read-only parameters displayed
> > there, I can update the module to have them show up.
> 
> Well, it would have been convenient yesterday, but in the end I found
> what I was after in dmesg (current brightness_mode).  But I guess

Ok, it is easy to fix this.  It will be in the next batch of low-urgency
changes.

-- 
  "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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