Takashi Iwai tiwai@suse.de [2015-04-27 19:12:21 +0200]:
Below is a debug patch, and now you should see messages like "XXX ..." in kernel log at loading the driver. If there is no such a message, it means that the thinkpad hook isn't built in at all. Please check the kernel log again with the patch.
Here are the XXX messages:
[ 13.722755] sound hdaudioC0D0: XXX hda_fixup_thinkpad_acpi init... [ 13.724366] sound hdaudioC0D0: XXX ok, this is thinkpad [ 13.724373] sound hdaudioC0D0: XXX mute LED NOT WORKING! [ 13.724374] sound hdaudioC0D0: XXX ok, mic LED is hooked
Smoking gun?
Btw, about "extramodules": Thanks for your suggestion on approaching that.
As it turns out, the only modules that were in /lib/extramodules from the distro install were tp_smapi and friends (thinkpad_ec, hdaps). (That's why my battery indicator wasn't working.) But after some reading, it seems like these are probably not implicated in the present issue, so I just said the heck with it and didn't bother to do anything further in attempting to recreate extramodules for the patched build. But if you think that any of that tp_smapi stuff might be relevant, let me know and I'll do what's necessary to build the extramodules subtree.