Problems with acpi buttons since last update

[gbm31]

hi,

since the last update, which involved some dbus level 4, i'm experiencing problems with the acpi buttons of my thinkpad.

after a restart, everything works fine, brightness, volume, suspend, hibernate, and the thinklight.

after some time up, mint seems to "forget" these functions, no acpi action from the buttons is recognized anymore.

before the update everything worked fine and reliably.

[gbm31]

i reinstalled tpb (thinkpadbuttons) - seems that did it for now.