[Bug 221238] lg-laptop: Spurious ACK and dropped keystrokes caused by ACPI method calls conflicting with i8042 driver

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221238

--- Comment #5 from Alfonso GARCIA FREY (alfonso.garcia.frey@gmail.com) ---
Tested battery_care_limit on kernel 5.15.0-171 with the stock lg-laptop module:

  # cat /sys/devices/platform/lg-laptop/battery_care_limit
  100
  # echo 80 > /sys/devices/platform/lg-laptop/battery_care_limit
  # cat /sys/devices/platform/lg-laptop/battery_care_limit
  80
  # echo 100 > /sys/devices/platform/lg-laptop/battery_care_limit
  # cat /sys/devices/platform/lg-laptop/battery_care_limit
  100

It looks like it works correctly for both values (80 and 100).

I also acknowledge that my original report incorrectly stated the driver uses
"raw inb()/outb()" — it actually uses acpi_evaluate_object() for
WMAB/WMBB/GGOV. The reference to battery_hook_register() is also incorrect for
5.15. Apologies for the inaccuracies.

The spurious ACK messages and key drops do still occur with the stock module
loaded and stop when the module is blacklisted (17 spurious ACKs per boot on
5.15, 114 on 6.8).

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