On Thursday 19 November 2009, Ferenc Wagner wrote: > Ferenc Wagner <wferi@xxxxxxx> writes: > > > Ferenc Wagner <wferi@xxxxxxx> writes: > > > >> "Rafael J. Wysocki" <rjw@xxxxxxx> writes: > >> > >>> On Wednesday 18 November 2009, Ferenc Wagner wrote: > >>> > >>>> Ferenc Wagner <wferi@xxxxxxx> writes: > >>>> > >>>> Side question: If I run s2disk from the init=/bin/bash prompt, the > >>>> instrumentation in acpi_enter_sleep_state_prep in drivers/acpi/acpica/hwsleep.c > >>>> fires before the "Snapshotting system" phase, but it does not fire if I > >>>> hibernate from the full running desktop. (That instrumentation was put > >>>> there to investigate the KMS-triggered STR freeze.) What could explain > >>>> this? > >>> > >>> It looks like it uses the "shutdown" method when run with init=/bin/bash, but > >>> I don't know why exactly. > >> > >> Thanks for the tip, I'll check this too. > > > > While looking into this, I found a reproducible kernel panic: > > > > 1. boot with init=/bin/bash > > 2. mount /usr; swapon -a > > 3. plug in a USB pendrive > > 4. s2disk (machine goes to sleep) > > 5. power on, proceed with resuming, press Enter to cancel resume pause > > 6. ACPI: Hardware changed while hibernated, cannot resume! > > Kernel panic - not syncing: ACPI S4 hardware signature mismatch > > > > Does it make sense? > > Yes it does: it's the BIOS USB support playing its childish games. > I can disable it most of the time, except when booting from USB... > > I wonder if this problem sould be handled more gracefully, now that USB > persistence is enabled by default. It works just fine for STR, but > potentially panics after hibernation. Add acpi_sleep=s4_nohwsig to the kernel command line. Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
