[arch-general] bug? Close the notebook‘s lid，that will cause the system reboot

My nb is Asus a50af, Ath.64 M320 + ATI Mobility Radeon HD5145 $ uname -a Linux bearhouse 3.2.1-2-ARCH #1 SMP PREEMPT Mon Jan 23 12:40:01 UTC 2012 x86_64 AMD Athlon(tm) II Dual-Core M320 AuthenticAMD GNU/Linux After I upgrade to kernel 3.2, meet a strange problem: I set the desktop to close screen when I close lid. If I do so, when I reopen the lid, the screen remain closed, any key can not open the screen. Even sometime after I reopen the lid, the system will reboot immediately！ I try it under kde4 and gnome3， same problem.**