On Fri, Mar 24, 2023 at 9:26 PM Armin Wolf <W_Armin@xxxxxx> wrote: > > 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 patch fixes an issue inside the ec driver regarding the > removal of query handlers discovered thru ACPI. The second patch fixes > a kernel oops on module removal caused by a race condition when removing > custom EC query handlers. 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. > > Tested on a Acer Travelmate 4002WLMi. > --- > Changes in v3: > - Rework solution for the kernel oops on module removal > Changes in v2: > - make acpi_ec_add_query_handler() static to fix warning > > Armin Wolf (3): > ACPI: EC: Limit explicit removal of query handlers to custom query > handlers > ACPI: EC: Fix oops when removing custom query handlers > ACPI: SBS: Fix handling of Smart Battery Selectors > > drivers/acpi/ec.c | 17 ++++++++++++++--- > drivers/acpi/sbs.c | 27 ++++++++++++++++++--------- > 2 files changed, 32 insertions(+), 12 deletions(-) > > -- All applied as 6.4 material with a minor comment adjustment in the first patch. Thanks!
