[Libreboot-dev] X200 Lenovo BIOS comparisons

[Nathaniel Roach]

Hi all!

I'm going to be flashing my X200 back to Lenovo BIOS in order to 
downgrade the EC (1.07 added a check for legitimate batteries, and 
considering the age of the machine, I may end up having to use non-OEM 
batteries).

The main thing I want to check it the EC behaviour regarding the mute 
button - according to some old kernel mailing list, and Launchpad [1], 
passing acpi_osi="Linux" (in LenovoBIOS) means the EC will pass through 
the mute button as a regular XF86 key, rather than handling the muting 
itself. To me, this sounds preferable to the current behaviour in libreboot.

I'm not going to be able to fix this myself, but if someone is 
interested in doing some comparisons (e.g. acpi tables) for this issue, 
or others (such as VT-X or VGA) I'm more than glad to help.

Nathaniel Roach

[1]: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/281732/comments/19