On my Acer Travelmate 4002WLMi, the system locks up upon suspend/shutdown. After a lot of research, it turned out that the sbs module was the culprit. The driver would not correctly mask out the value used to select a battery using the "Smart Battery Selector" (subset of the "Smart Battery Manager"). This accidentally caused a invalid power source to be selected, which was automatically corrected by the selector. Upon notifing the host about the corrected power source, some batteries would be selected for re-reading, causing a endless loop. This would lead to some workqueues filling up, which caused the lockup upon suspend/shutdown. The first three patches fix a stacktrace on module removal caused by some locking issues. The last patch finally fixes the suspend/shutdown issues. As a side note: This was the first machine on which i installed Linux, to finally fixing this took ~5 years of tinkering. Armin Wolf (4): ACPI: EC: Add query notifier support ACPI: sbshc: Use ec query notifier call chain ACPI: EC: Make query handlers private ACPI: SBS: Fix handling of Smart Battery Selectors drivers/acpi/ec.c | 44 ++++++++++++++++++++-------------------- drivers/acpi/internal.h | 10 ++++----- drivers/acpi/sbs.c | 27 ++++++++++++++++--------- drivers/acpi/sbshc.c | 45 ++++++++++++++++++++++++++--------------- 4 files changed, 74 insertions(+), 52 deletions(-) -- 2.30.2
