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Some Windows XP users (particularly some with ASUS laptops) experience the following warnings, sometimes very many of them, in the system event log:
The problem seems to be known, though rare—a chatty ACPI Embedded Controller chip and Windows XP, which is newly sensitive to this, but no thorough solution is in sight so far. The most likely solution would be a corrected BIOS, but only if it is true what the warning message says. Another solution could be to remove the new sensitivity from Windows XP again and make it as deaf to unwanted ACPIEC babbling as all earlier versions of Windows were. But that's in Microsoft's hands.
It may be a dying problem, as faster processors reduce the impact and newer BIOS versions may prevent the problem in the first place.
As I found out much later, the errors are triggered by programs like temperature monitors or DVD playing programs, which query the ACPIEC chip for temperature or battery charge information or similar. The DVD player WinDVD, for example, does it to find out whether the battery of a laptop is running low.
At first I've suppressed this problem by crudely disabling the ACPIEC driver (acpiec.sys), but this disables most power saving functions as well. At least it solved my immediate problem that a video from DVD would jerk every three minutes while XP is busy writing a burst of ACPIEC warnings. So what I do now is disable the driver before watching a DVD and reenable it afterwards. I don't want the system to suddenly start saving energy while I watch a DVD movie anyway.
Please see the control files below. To get them, cut them out here, paste them into the editor and save them as Unicode text with a file name ending in ".reg". To use them, just double-click on them, answer yes to the question, then reboot. (I have not found any way so far to stop the driver without rebooting. When I try, the system refuses.)
I have the problem on an Asus A1B notebook with the 0110 BIOS—the latest.
If you've tried any of these proposals and if you could find out whether they worked or didn't work for you, please add a comment.
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