Red Hat Bugzilla – Bug 738632
Windows 2008 doesnt detect KVM serial port
Last modified: 2013-01-09 19:20:03 EST
Description of problem:
Win 2008 R2 (tested with and without SP1) doesnt detect qemu/kvm's virtual serial ports (neither default pty nor "real" physical host tty port)
Version-Release number of selected component (if applicable):
fedora 15 (host)
ms windows server 2008 r2 (guest)
Steps to Reproduce:
1. create a vm using virt-manager install windows 2008 r2 and boot
2. look for serial port (there should be one, the default pty port)
3. manually try to add serial port using device manager -> add legay hardware
error code 34, resources are already in use
I/O address 0x3F8 is already in use by "PCI-Bus"
IRQ 4 is already in use by "ACPI x64-based PC"
a just-working com port;-)
windows seems not detecting the com port because the i/o address and irq is already in use, but why? i think those addresses are default for first COM port! if i boot linux in that VM, the com port works using exactly those address and irq!
i have found a way to force windows using default I/O address and IRQ by disabling "auto config" under device-manager->serial-port (manually created) -> ressources.
after that you have to reboot and -> IT WORKS!!!
but why auto-detection doesn't work by default is still very strange...
now there is still bug 596553 (https://bugzilla.redhat.com/show_bug.cgi?id=596553) with that "opening backend tty failed" error but this is another story and there also is a workaround....
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
F15 is end of life in a month. Mathias, are you seeing this issue on a more recent fedora? If so we can follow up from there.
F15 is end of life now, so closing. Please reopen if you still see this with F16 or later