Ok, my intuos4 tablet was working fine just a while ago, and now, the side buttons + touchring aren't working properly, the mapping doesn't work, no matter what mappings I set in the wacom configuration tool - each button seems to map into something other than what I've set them - some seem to be mapping into mouse buttons, some to something else, and the touch ring does nothing.
I'm not sure, but I think these problems started after the recent update with the libdrm stuff.
I've tried creating a new user account to test that it isn't any local settings on my account, and the same problems persist there.
The pen still works fine, pressure and tilt detection both function normally. It's only the side buttons + touch ring that aren't functioning properly.