volume keys and mute key don't work in Thinkpad T40 - Jaunty regression

[Nick Jenkins]

Volume keys and mute key don't work on IBM Thinkpad T40 laptop. Jaunty regression. Worked fine in 8.04, 8.10, but in the Ubuntu 9.04 preview release that I installed yesterday these buttons no longer work.

Some more info as suggested by the https://wiki.ubuntu.com/Hotkeys/Troubleshooting page:
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$ killall gnome-settings-daemon gnome-power-manager
$ xev | sed -n 's/^.*state \([0-9].*\), keycode *\([0-9]\+\) *\(.*\), .*$/keycode \2 = \3, state = \1/p'
# Result: no keypresses were indicated on pressing these keys
$ hal-find-by-capability --capability input | xargs -n1 lshal -u
# result: did not show any keys that were obviously related to volume, muting, etc.
$ hal-find-by-capability --capability input | xargs -n1 lshal -u > lshal.log
$ lshal |grep system.hardware
  system.hardware.primary_video.product = 19543 (0x4c57) (int)
  system.hardware.primary_video.vendor = 4098 (0x1002) (int)
  system.hardware.product = '2373CM3' (string)
  system.hardware.serial = '998N6T0' (string)
  system.hardware.uuid = '5D616681-487C-11CB-9D81-E2C74DDCB08E' (string)
  system.hardware.vendor = 'IBM' (string)
  system.hardware.version = 'ThinkPad T40' (string)
$ dmesg > dmesg.log
$ sudo lsinput > lsinput.log
sudo: lsinput: command not found
$ xkbcomp -xkb :0 - > xkbcomp.txt
Warning: Could not load keyboard geometry for :0
                  BadAlloc (insufficient resources for operation)
                  Resulting keymap file will not describe geometry
$ setxkbmap -print > xkbmap.txt
$ lsb_release -rd
Description: Ubuntu jaunty (development branch)
Release: 9.04
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[Jonathan Ernst (jonathan.ernst)]

Same regression on my Thinkpad T60

[Nick Jenkins (nickpj)]

I have applied some further updates 9.04 since logging this, and what I observe now is that pressing the mute and volume keys does now mute and change the volume; However, still I don't get a popup notification of the changed volume, and if I click the volume panel applet, then it is still set to the same volume despite any changes that I make by pressing the buttons.

In 8.10 and 8.04, it used to show a notification on the screen when the sound volume was changed with these keys or when the sound was muted. Also the volume applet would reflect changes in volume made with these hotkeys. So whilst the actual volume is changed now in 9.04 with these keys, the bit the links it to the software, or gives visual software feedback from these keys, appears to have regressed from previous versions on the T40 Thinkpad.

[Andrew (andrewkvalheim)]

According to bug 364127, software detection of the ThinkPad volume control keys was intentionally disabled because it "causes double-stepping of the volume, because the volume was also being adjusted in the hardware mixer, which we can't disable."

[jean-baptiste (jbateau54)]

some probleme with ibm thinkpad t42. The buttons volume_up volume_down and mute use to work in intrepid, but no more in jaunty.