After upgrade to 15.10, my laptop no longer suspends.
[…] PM: Syncing filesystems ... done. […] PM: Preparing system for sleep (mem) […] Freezing user space processes ... (elapsed 0.001 seconds) done. […] Freezing remaining freezable tasks ... […] Freezing of tasks failed after 20.008 seconds (0 tasks refusing to freeze, wq_busy=1):
That seems to blame
wq_busy for being true, but I'm not having luck finding out why that might be the case or how I might fix it. (Internet searches seems to always pull up the more popular case where a task refuses to freeze.) What does