[coreboot] mute button on X200

[Francis Rowe]

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Hi,

On the Lenovo X200 with coreboot installed, the volume up/down keys on
the keyboard work, but the mute key doesn't (it does in factory BIOS).

I'm investigating this myself, but in case I fail, I'm also reporting
this here.

First I tried monitoring it in xev, but that doesn't seem to show
anything in factory bios either. This button is controlled by the EC,
isn't it? And coreboot has to expose that somehow.

I tried looking in the coreboot src to see what I needed to modify,
but I haven't found it yet. I looked in src/ec/lenovo/h8/acpi/ec.asl
mostly.

Any ideas?

Regards,
Francis Rowe.
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