I was having these on an irregular basis until I installed a test kernel
based on the upcoming -11 kernel. There is an ACPI flood detection fix
for non-interrupt access which looks likely the base of the fix. If
those who were seeing this extensively could try the kernel at the URL
below and report back:
http://people.ubuntu.com/~apw/webcams1/
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ACPI: EC: missing confirmations, switch off interrupt mode.
https://bugs.launchpad.net/bugs/284263
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