Re: [RFC PATCH] thinkpad-acpi: Improve hardware volume controls

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On Mon, May 9, 2011 at 7:53 PM, Henrique de Moraes Holschuh
<hmh@xxxxxxxxxx> wrote:
> Interesting.  Let me test it on my T43, it has hardware volume and seems to
> cover a class of box you couldn't test.
>
> I like the idea, but I might have some questions to ask you about it.  More
> on this after I test the patch in the next few days.

FWIW, this patch (other than having the wrong default on X220) makes
Linux better than Windows :)

Do you know how to read a field from the EC by name?  I think I can
pull out the default value from the HAUM field, but I don't know how
to access it through acpica and installing a custom method just to
read a register seems like a bad idea.  (The register's in the same
place on X200 and X220, though, so maybe it's stable enough to just
read.  But using the field listing in the DSDT would make me happy.)

Also, do you know how to ask the kernel what the most recent acpi
interrupt was?  I'd like to find a better way to detect the mute
button than watching for the keyboard event.

--Andy

>
> --
>  "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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