[ibm-acpi-devel] [ltp] Re: thinkpad-acpi release 0.24-20100220 uploaded to ibm-acpi.sf.net

Jerone Young linux-thinkpad@linux-thinkpad.org
Mon, 22 Feb 2010 21:27:16 -0600

On Tue, 2010-02-23 at 00:16 -0300, Henrique de Moraes Holschuh wrote:
> On Mon, 22 Feb 2010, Jerone Young wrote:
> > > with OSI=Linux, the EC doesn't actually mutes anything anymore, even if it
> > > is telling you that it did it?
> > Correct. Though on my X301 while it doesn't mute the volume you do see
> > the mute light turn on. Proc interface does show it muted. Then unmute
> > and the light turns off. But does not effect the volume in anyway.
> > 
> > > What happens when you do press the mute hotkey in that situation?  Does it
> > > mute things?
> > Well it actually sends a mute key press to the OS. So linux picks it up
> > and Mutes the alsa mixer or pulse audio mixer (who will then mute alsa
> > mixer). 
> Jeez, it looks like Lenovo tried to work around a work around or something,
> I don't know if we will ever have sane volume control anymore.
> So far, it looks like I have to blacklist volume control if OSI=Linux is
> active in the X301.  What is your firmware version?  Is it the latest?
Yes it is the latest (6EET49WW (3.09 )). It's is for all X301 firmware

Though this work around seems to be in all Thinkpad Bioses. If you go
into the kernel in drivers/acpi/blacklist.c you can see the current
Thinkpads that it is there for now.

For the X/T 61 & T 400/500 there is not little light to show the mute is
on. It seems having OSI=Linux actually creates a better user experience
for these laptops. Same for the X200 (which I had planned a patch for).

But now all new Thinkpads out of Lenovo use the new keyboard format and
the mute now has a little light. Can see this with the T410 and the
other thinkpads.