Public bug reported: My Sony PCG-Z1RMP laptop has F3 labelled with a crossed-out speaker mute symbol and F4 labelled with a volume triangle symbol.
On Windows pressing the Fn key in combination with F3 mutes/unmutes the audio whereas F4 brings up a window which can be used to vary the volume using the cursor keys. For years when running Debian GNU/Linux on the laptop Fn+F3 caused the volume to go down and Fn+F4 caused it to go up. This didn't quite match the labels on the keys but worked well enough. I believe that the early versions of Ubuntu (Dapper onwards) used to behave like this too. At some point (Jaunty or before) the Fn+F3 key started both muting/unmuting and lowering the volume. Pressing it once would lower the volume slightly but mute the audio. Pressing it again would unmute the audio and lower the volume some more. I followed some of the steps at https://wiki.ubuntu.com/Hotkeys/Troubleshooting and it would appear that the Fn+F3 button press is appearing on both the keyboard and another event device. The recommendation there is that I file this bug against "linux". Note that in what follows I pressed the key combination three times for each invocation of keymap. It's not clear to me why the first time the key appears as scan code 0x00 on /dev/input/event4 and all subsequent presses appear as scan code 0x0E. Stopping and restarting keymap results in the same behaviour each time. redbox:~> /lib/udev/findkeyboards AT keyboard: input/event3 module: input/event4 redbox:~> sudo /lib/udev/keymap -i input/event3 Press ESC to finish scan code: 0x1C key code: volumedown scan code: 0x1C key code: volumedown scan code: 0x1C key code: volumedown redbox:-> sudo /lib/udev/keymap -i input/event4 Press ESC to finish scan code: 0x00 key code: mute scan code: 0x0E key code: mute scan code: 0x0E key code: mute redbox:~> cat /sys/class/input/event4/device/{name,modalias} Sony Vaio Keys input:b0010v104Dp0000e0000e0,1,4,k71,72,73,8A,94,95,9E,A1,B7,B8,B9,CA,CB,CD,D4,E0,E1,E3,EC,ED,EE,121,174,1A2,1A3,1D0,1D1,1D2,1D3,1D9,1DA,1DC,1E0,1E1,1E2,1E3,1E4,ram4,lsfw redbox:~> readlink /sys/class/input/event4/device/device/driver/module ../../../../module/sony_laptop Please let me know if you need any more information. ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- Mute key acts as both mute and volume down https://bugs.launchpad.net/bugs/516300 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
