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1b1ed1a
(Get the code!)
This is causing bug 59695 (the infamous laptop-killing bug), or rather, is the actual cause of the drive problem.
On my laptop, ACPID gets a battery event roughly every 15 seconds, each of these produces a write to the log file.
Laptop hard drives seem to be set up for bursty I/O (a reasonably assumption for general laptop usage), so their worst-case scenario is precisely this, a single write every 15 seconds. The laptop parks after 10 seconds of inactivity, then gets woken up about 5 seconds later, and this repeats continuously whenever the laptop is idle.
The simplest fix is to disable ACPID logging by adding "-l /dev/null" to the command line. Ultimately ACPID should be changed to only log errors and infrequent events.
This needs to be communicated upstream - it will happen on any distro that uses ACPID and lets it log its output. I've seen it on Debian, too.