I can confirm this bug on a NEC Versa L2200 laptop.
On startup, the keyboard is fully responsive.
Incorrect behavior is triggered by a power event (power unplugged,
battery full, etc) and lasts until the system is rebooted.
When unplugging the power after being fully charged, the following
message is logged to /var/log/acpid 50 or so times per second.
{{{
[Sat Jan 5 22:20:40 2008] completed event "battery BAT1 00000080 00000001"
[Sat Jan 5 22:20:40 2008] received event "battery BAT1 00000080 00000001"
[Sat Jan 5 22:20:40 2008] notifying client 5111[0:0]
[Sat Jan 5 22:20:40 2008] notifying client 4784[107:116]
[Sat Jan 5 22:20:40 2008] executing action "/etc/acpi/power.sh"
[Sat Jan 5 22:20:40 2008] BEGIN HANDLER MESSAGES
[Sat Jan 5 22:20:40 2008] END HANDLER MESSAGES
}}}
`sudo /etc/init.d/acpid restart` fixes the problem when it occurs until
another notification takes place.
`sudo /etc/init.d/acpid stop` fixes the problem but disables
notifications.
Will do some further investigation tomorrow.
Possibly related to #39315 or #20681.
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Laptop keyboard lags or skips during typing
https://bugs.launchpad.net/bugs/119084
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