applied to acpi-test. thanks, -Len On Sat, 4 Oct 2008, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rjw@xxxxxxx> > > ACPI Suspend: Enable ACPI during resume if SCI_EN is not set > > On some machines, like for example MSI Wind U100, the BIOS doesn't > enable ACPI before returning control to the OS, which sometimes > causes resume to fail. This is against the ACPI specification, > which clearly states that "When the platform is waking from an S1, S2 > or S3 state, OSPM assumes the hardware is already in the ACPI mode > and will not issue an ACPI_ENABLE", but it won't hurt to check the > SCI_EN bit and enable ACPI during resume from S3 if this bit is not > set. > > Fortunately, we already have acpi_enable() for that, so use it in the > resume code path, before executing _BFS, in analogy with the > resume-from-hibernation code path. > > NOTE: We aren't supposed to set SCI_EN directly, because it's owned > by the hardware. > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> > --- > drivers/acpi/sleep/main.c | 2 ++ > 1 file changed, 2 insertions(+) > > Index: linux-2.6/drivers/acpi/sleep/main.c > =================================================================== > --- linux-2.6.orig/drivers/acpi/sleep/main.c > +++ linux-2.6/drivers/acpi/sleep/main.c > @@ -200,6 +200,8 @@ static int acpi_suspend_enter(suspend_st > break; > } > > + /* If ACPI is not enabled by the BIOS, we need to enable it here. */ > + acpi_enable(); > /* Reprogram control registers and execute _BFS */ > acpi_leave_sleep_state_prep(acpi_state); > > _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
