Briefly: MacBook issues, fixes

Kernel panics under high AirPort load

Various Macs are exhibiting an issue where kernel panics repeatedly occur when AirPort is turned on and the network is active with high loads. Users are reporting that kernel panics disappear when an Ethernet cable or other network connection method is used, and the issue is especially prominent when connecting to a third-party wireless router.

In some cases, faulty AirPort Extreme cards are known to cause consistent startup kernel panics and other issues. The cause is generally soluble only with replacement of AirPort cards. Before seeking replacement, users should make sure that the AirPort card is not seated improperly or simply having problems with a specific machine, and can try using the card in another Mac or have it tested at a local Apple reseller or Apple Store.

Other potential causes for this issue include bad RAM and improper network settings.

.plist corruption

Property List (.plist) files have a tendency to become corrupt, with the cause of damage usually stemming from a problematic write to their data. Reasons for these problematic writes are varied, though users should note that the host application -- for which the .plist file is named -- may not be the only application writing to that file.

Third-party applications are able to, and routinely do modify property list (.plist) files, which makes it easier to recognize why these files routinely become corrupt -- usually due to potentially buggy write routines in such applications.

MacBook Pros waking up when lid is closed, sleep issues

Several users have experienced an issue where the MacBook Pro fails to sleep properly, or does not stay asleep when the lid is closed. The issue is typically identifiable by the system fans remaining on and the sleep light not pulsating while the MacBook Pro's lid is closed. The system will often be very hot to the touch when this occurs.

Users can often modify Energy Saver settings and disconnect problematic external devices to repair the issue. Another fix involves opening the file com.apple.PowerManagement.plist (located in /Library/Preferences/SystemConfiguration/) with a text editor, then scanning for the line of text that reads "Wake On Clamshell Open." Users can change the "1" in the line of text below to "0" and save the file. An administrator password is required to make the previously mentioned changes, and restarting the MacBook Pro will enact the changes.

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