Apple launched Mavericks and some new MacBook models but now some owners of the 2013 MacBooks may be affected by a bug in the Mavericks that mutes all system sounds after they open up the device from sleep.
There are quite a few threads on forums with users complaining that there MacBook has no sound after resuming from sleep and there is no way to enable it. There are also some reports which are saying that after resuming from sleep that the MacBooks are using high CPU which is making battery life poor. Users are reporting seeing this error in there system logs#;
kernel: Sound assertion in AppleHDAController at line 5460
The issue at the moment is only affecting the new Haswell-based MacBooks which includes the new MacBook Air and MacBook Pro retina models. At the moment there isn’t much of a fix, while some users just reboot the machines and it fixes the issue for a while and some users have reported that putting in headphones and unplugging them fixes the issue but at the moment there is no real fix available.
Apple has not commented on the issue at the moment, we will update the post if Apple comments on the issue or releases a fix.