Audio ACPI interface is read-only; can't unmute
Posted: Tue Sep 13, 2011 9:19 am
I have a W500 running Ubuntu 11.04 with Linux 2.6.38. I want to be able to unmute the ACPI volume control from software because I'm using it as an alarm clock and it is necessary to be able to disable all forms of muting for this to be reliable.
Attempting to write to /proc/acpi/ibm/volume produces "write error: Operation not permitted".
Code: Select all
[ 30.299776] thinkpad_acpi: Console audio control enabled, mode: monitor (read only) [ 5737.170493] thinkpad_acpi: Console audio control in monitor mode, changes are not allowed.