The keyboard volume bindings (up, down, mute) no longer work. xev shows that the keys are properly picked up by the X server with the proper keysym, so I guess the problem is simply that GNOME no longer properly grabs them.
Is gnome-settings-deamon running ?
Yup: $ ps ax | grep gnome-sett 3005 ? Ssl 1:32 /usr/libexec/gnome-settings-daemon
Please test with 2.23.6, I think it was caused by the regression from: http://bugzilla.gnome.org/show_bug.cgi?id=165343#c71
That did indeed solve it. Thanks.
Cool, closing.