Sometimes, but not every time, when I open my MacBook Pro to wake it from sleep, the keyboard doesn't respond, so I have to reboot my Mac using the power button.
There's a good chance that it happens when I close the lid without the laptop being plugged into power (the MagSafe plug), then plug in either power or headphones before I wake the computer again.
It is a MacBook Pro 15"(2011), 2.2Ghz Intel Core i7, 500GB 5400 RPM, 8G RAM running Mac OS X Lion 10.7.3 (11D50d). I have zh-CN (PRC Chinese) (Mainland China, simplified characters) as the preferred language for all users by default. I upgraded my Lion one by one (from 10.7 to 10.7.1,... till 10.7.3) and while upgrading, I didn't get any error or alert. So the updates went well.
I tried to solve it following a work around involving inserting and unplugging my headphones, but that didn't work out.
Is there any solid solution, or is this a known MacBook Pro issue?