Dear, I have the same problem on my debian wheezy system.Tried with various kernels from kernel.org (3.12.15, 3.14.26, 3.18) all reboot the system instead of shutdown.
The only way to shutdown the system is via halt -fpMotherboard is Gigabyte GA-990FXA-UD5 with AMD FX(tm)-6200 Six-Core Processor
Any news on this issue? KR, Maarten -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org