device: 0.196 semantic: 0.166 graphic: 0.142 debug: 0.097 other: 0.083 PID: 0.060 performance: 0.053 permissions: 0.039 boot: 0.037 vnc: 0.037 files: 0.032 socket: 0.030 network: 0.018 KVM: 0.009 debug: 0.810 PID: 0.046 files: 0.035 other: 0.025 device: 0.022 performance: 0.012 network: 0.011 socket: 0.011 semantic: 0.008 boot: 0.005 graphic: 0.005 permissions: 0.004 vnc: 0.004 KVM: 0.002 Serial Named Pipe Unrecognized Windows 7 I created a named pipe serial hardware and supplied '/tmp/debug' which I created using mkfifo This is the snippet from ps -aux -chardev pipe,id=charserial0,path=/tmp/debug -device isa-serial,chardev=charserial0,id=serial0 failure@ubuntu1:~$ ls -al /tmp/debug* prwxrwxrwx 1 jgp jgp 0 2012-03-03 18:40 /tmp/debug prwxrwxrwx 1 jgp jgp 0 2012-03-03 18:40 /tmp/debug.in However inside the Windows 7 guest (even after a restart) nothing is recognized. Even after going through the add legacy hardware motions it's still not picked up. Which version of QEMU were you using? Can you still reproduce this issue with the latest version of QEMU? [Expired for QEMU because there has been no activity for 60 days.]