FS#44302 - [linux] Upgrading from linux 3.18.6-1 to 3.19.2-1 breaks "Audio Mute" key

Attached to Project: Arch Linux
Opened by Glenn (grepfor) - Sunday, 22 March 2015, 16:23 GMT
Last edited by Doug Newgard (Scimmia) - Tuesday, 24 March 2015, 14:25 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To Tobias Powalowski (tpowa)
Thomas Bächler (brain0)
Architecture x86_64
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

On a Lenovo/ThinkPad T-510, x86_64, the following package upgrades

* linux-3.18.6-1 -> linux-3.19.2-1
* linux-headers-3.18.6-1 -> linux-headers-3.19.2-1
* tp_smapi-0.41-62 -> tp_smapi-0.41-65

cause previously-working Audio Mute key (XF86AudioMute) to stop working.
(Pressing the key has no effect.)

Prior to the upgrade, key worked as expected.

Downgrading the above packages to the earlier versions shown above restores
expected operation.

NOTES:

* The above upgrades were part of a normal full -Syyu. Package
bisection revealed that the problem tracked the kernel
and associated pkgs shown above.
This task depends upon

Closed by  Doug Newgard (Scimmia)
Tuesday, 24 March 2015, 14:25 GMT
Reason for closing:  Not a bug
Comment by Thomas Dziedzic (tomd123) - Tuesday, 24 March 2015, 07:16 GMT
After some quick googling, I came across:
http://sourceforge.net/p/ibm-acpi/mailman/message/33439780/

Seems related
Comment by Glenn (grepfor) - Tuesday, 24 March 2015, 11:51 GMT
Thanks Thomas. Came across that as well.

Short story seems to be that 3.19 kernel disabled direct HW control of muting functions for ThinkPads. Major desktops (gnome, etc.) kept up with this change and added appropriate SW control, so users of those desktops see no functional change. But those of us who run w/o fancy desktop mgrs suddenly have non-working AudioMute (and MicMute too, btw) so need to now bind those keys to the appropriate mixer control functions.

Close of ticket ok by me.

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