i have the same issue with a thinkpad t400. as suggested elsewhere, updating the bios and adding the boot option acpi_osi="Linux" fixes the issue. both mute and unmute works and i get the correct OSD. however, since i don't really know what other things the acpi_osi="Linux" boot option alters i'm reluctant to use it.
-- Mute button on thinkpad x200/x200s https://bugs.launchpad.net/bugs/281732 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
