> On Aug 30, 2015, at 23:13, Andriy Gapon <a...@freebsd.org> wrote: > > > I would appreciate any pointers at how to debug an ACPI suspend problem that > I have. > > What I have so far. The system hangs when I try to suspend it and it gets > reset > by a watchdog. Setting debug.acpi.suspend_bounce=1 does not make any > difference, so the hang happens before the final sleep code is executed. I > think that the device suspend stage is executed, because disks get spun down > and > video signals gets cut off. > > I could enable / add some debug printfs, but I suppose that their output would > get lost due to the above. RAM content unfortunately does not survive across > the resets.
When I last had to do this to figure out what magic formula was required to get my netbook working, I did something like this: 1. Stripped down the kernel to just the storage driver and core pieces. 2. Loaded all other modules after boot, if necessary. 3. Called zzz with the appropriate ACPI tunables/sysctls set. That got me pointed in the right direction (IIRC it was psm at the time). What I did to get a real smoking gun was I put printf statements in subr_bus.c (IIRC) to track device quiescing at suspend and reawakening at resume. There’s `options BUS_DEBUG` too, which may or may not help. FWIW I found debug.acpi.suspend_bounce less useful, but it still exercised the quiesce->reawaken cycle, sorta. There’s also `hw.acpi.reset_video` and `debug.acpi.resume_beep`. You might need to hack /etc/rc.resume and /etc/rc.suspend, BTW, depending on what you discover (switching my vty was definitely required in order for X11 to come back in a sane manner at resume). Cheers, -NGie _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
