Yet another "me too", this time the error seems related to the graphics-
controller:

Nov  2 13:36:21 box kernel: [ 8055.273097] ACPI: EC: missing confirmations, 
switch off interrupt mode.
Nov  2 13:36:21 box kernel: [ 8055.793155] ACPI Exception (evregion-0419): 
AE_TIME, Returned by Handler for [EmbeddedControl] [20080609]
Nov  2 13:36:21 box kernel: [ 8055.793198] ACPI Error (psparse-0530): Method 
parse/execution failed [\_SB_.PCI0.GFX0.DD03._BQC] (Node ffff88007f33c480), 
AE_TIME

The error occurs after about 2 to 4h uptime for some time now. When this
happens, the keyboard gets very unresponsive and the only way to fix
this seems to be a reboot.

-- 
ACPI: EC: missing confirmations, switch off interrupt mode.
https://bugs.launchpad.net/bugs/284263
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