On Sunday, July 08, 2012, Octavio Alvarez wrote: > On Sun, 08 Jul 2012 13:08:19 -0700, Rafael J. Wysocki <rjw@xxxxxxx> wrote: > > >> This is an old suspend/resume lockup fix: > >> > >> commit 2780cc4660e1 > >> Author: Len Brown <len.brown@xxxxxxxxx> > >> Date: Thu Dec 23 13:43:30 2004 -0500 > >> > >> [ACPI] Fix suspend/resume lockup issue > >> by leaving Bus Master Arbitration enabled. > >> The ACPI spec mandates it be disabled only for C3. > >> > >> The bug snuck back in in commit 2feec47d4c5f (ACPICA: ACPI 5: Support > >> for new FADT SleepStatus, SleepControl registers, 2012-02-14), > >> presumably by copy/pasting a copy of the code without that fix for the > >> legacy case. > >> > >> On affected machines, after that commit, the machine locks up hard on > >> resume from suspend. The same fix as seven years ago still works. > >> > > Applied to the linux-next branch of the linux-pm.git tree. > > > > I think I'll push it for v3.6, since the bug is serious and is a > > regression. > > > > Bob, I think we should incorporate this into ACPICA, shouldn't we? > > This bug affects since 3.4. I'd like to ask for this to be applied in the > stable branches too, considering Jonathan's comments that this is a replay > of an old and proven fix. > > (I don't know if 3.3 is affected too. I know 3.2 is not affected by this.) The problem seems to have been introduced during the 3.4 development cycle, so v3.3 shouldn't be affected by it too. 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
