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[Xen-users] VNC/VGA console stuck when not using 'quiet splash'

  • To: xen-users@xxxxxxxxxxxxxxxxxxxx
  • From: Wiebe Cazemier <wiebe@xxxxxxxxxxxx>
  • Date: Fri, 16 Mar 2018 12:32:00 +0100 (CET)
  • Delivery-date: Fri, 16 Mar 2018 11:33:22 +0000
  • List-id: Xen user discussion <xen-users.lists.xenproject.org>
  • Thread-index: 3GWFdVPO4Z80vGRCxac6Ed/+UL74HA==
  • Thread-topic: VNC/VGA console stuck when not using 'quiet splash'


I'm working on converting all my PVs to HVM (although that fact seems 
unrelated), and I'm having issues with VNC/VGA. When I VNC to it, I don't see 
anything after BIOS, except two lines, and I can't type (no agetty, even though 
ps axu says it runs on tty1).

See screen shot. This is taken with 'xl vncviewer'. If I connect with krdc over 
an SSH tunnel right after machine creation, I see the BIOS text, then it clears 
into garble, then after a while it clears and prints that last line.

If I change /etc/defaut/grub and remove 'quiet' and 'splash' from 
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash", it works fine. But, that's only a 
work-around; I don't want my guests to be able to break VNC.

setting vga="stdvga" doesn't help.

Does anyone know how to fix this?

Host Ubuntu: 14.04
Host Xen: 4.4.2-0ubuntu0.14.04.14
Host qemu-system-x86_64: 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.36)
Guest Ubuntu: 17.10



Attachment: xen-vnc.png
Description: PNG image

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