[ltp] CALL FOR TESTING: thinkpad-acpi BETA release 0.14-20070708

[Henrique de Moraes Holschuh]

On Mon, 09 Jul 2007, Sebastian Schmidt wrote:
> On Sun, Jul 08, 2007 at 06:40:10PM -0300, Henrique de Moraes Holschuh wrote:
> > On Sun, 08 Jul 2007, Sebastian Schmidt wrote:
> > > I tested a bit. Notebook is Lenovo X60s, BIOS version is 2.07
> > > (7BETC6WW) as of 2007-02-06.
> > 
> > Not the latest one, I don't know if that will affect anything, but...
> 
> Hmm, strange: I double-checked my Thinkpad update tool about a few hours
> ago but it didn't show up a BIOS update. Although I remember having seen
> one some time ago. I'll check this tomorrow.

http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-63144

It is there, but don't ask me why the system update tool didn't offer it to
you (better read the README to make sure you want it, etc).

> > > When pressing a button, the display has a "lag" of about 1.5 seconds for
> > > the brightness to get applied. Also, setting brightness via /proc
> > > doesn't work:
> > >   echo: write error: invalid argument
> > 
> > This is strange. Does it work over sysfs?
> 
> Yep, that works. By the way, just looking at

Ok. Exaclty what did you echo to /proc/acpi/ibm/brightness? It seems to be
working just fine, here...

> /sys/class/backlight/thinkpad_screen/actual_brightness, I wonder if that
> shouldn't be called "current_brightness" instead? (No idea if you mean
> the acutal or the current brightness, I'm just asking because this is a
> very common "false friend" in germany ;-).)

Maybe, but you'll have to fight the backlight class mainainer over it :-) It
was not my choice.  I think the idea is that both are current, but actual is
what is really in hardware, i.e. the closest it could get to what you
asked, or somesuch.

> Do you have an idea about the delay between pressing the button and the
> display finally adjusting brightness? Setting via sysfs causes the
> brightness to change immediately.

ACPI video must be doing something weird.  thinkpad-acpi does *not* touch
the brightness stuff unless you are reading or writing to its backlight
sysfs interface, or to /proc stuff.

-- 
  "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