Hi Takashi, I noted you are working on this bug: https://bugzilla.suse.com/show_bug.cgi?id=904483 which has also been passed to here: https://bugs.freedesktop.org/show_bug.cgi?id=86115 When checking the hardware in this bug report I noted he has a WD drive which also does not support APM: WDC WD20EARS-00MVWB Do you think there is a possible connection ? I noted your comment here: "One is the broken graphics by S3, and another is the kernel panic due to the stall of disk PM" Thanks