I have a Laptop HP DV9285, and sometimes my hotkeys stop working and when this happens i cannot turn off computer completly, it starts to shutdown and never turns off. This issue started in kernel > 2.6.31. Until 2.6.31 my computer worked flawlessly, with the hotkeys working well and i would shutdown completly. upon 2.6.31 like in mandriva 2010.1 with 2.6.33 and in opensuse with 2.6.34 and with ubuntu with 2.6.35 sometimes the hotkeys stop working and when this happens i cannot turn off computer.
From the description it seems that the 2.6.31 kernel can work on your box. will you please use the git-bisect to identify which commit causes the issue? Thanks.
Did 2.6.30 work fine? Can you try the 2.6.30 ec driver in your 2.6.31 source tree? (ie. limit the bisect to drivers/acpi/ec.c) Upon the failure, do you see anything in dmesg? does /proc/interrupts show that acpi interrupts are being received when you press the power button?
bug closed as there is no response from the bug reporter for more than a month. Please feel free to re-open it if the problem still exists in the latest upstream kernel, say 2.6.37-rc7 and you can provide the info requested in comment #1 and #2.