Comment 62 for bug 595896

a bit more info:

'echo 0x078dffff > /sys/devices/platform/thinkpad_acpi/hotkey_mask' or 'echo 0x00fdffff > /sys/devices/platform/thinkpad_acpi/hotkey_mask' does not change anything to the mute button behaviour: volume up/down keys keep on working, and the mute button does not mute anything.

Here is a dump of all hotkey* files as they are initially before the echo commands are issued:

> more hotkey*
::::::::::::::
hotkey_all_mask
::::::::::::::
0x07ffffff
::::::::::::::
hotkey_bios_enabled
::::::::::::::
0
::::::::::::::
hotkey_bios_mask
::::::::::::::
0x0000080c
::::::::::::::
hotkey_enable
::::::::::::::
1
::::::::::::::
hotkey_mask
::::::::::::::
0x008dffff
::::::::::::::
hotkey_poll_freq
::::::::::::::
10
::::::::::::::
hotkey_radio_sw
::::::::::::::
1
::::::::::::::
hotkey_recommended_mask
::::::::::::::
0x078dffff
::::::::::::::
hotkey_report_mode
::::::::::::::
1
::::::::::::::
hotkey_source_mask
::::::::::::::
0x00000000
::::::::::::::
hotkey_tablet_mode
::::::::::::::
0