[SOLVED] Blank black screen with NoVNC console on KVM guests

[MimCom]

NoVNC consoles work just fine in all of our LXC's. Recently set up two KVM guests, neither of which will give us a console. Grey 'connected' banner comes up and then goes away, leaving just a black screen. No cursor, no change from keyboard or mouse inputs:

 

[fireon]

Please post you your vmconfig.

qm config 1028

 

[MimCom]

Here are both of them:

root@pve1:~# qm config 102
balloon: 768
bootdisk: scsi0
cores: 3
ide2: local:iso/Ubuntu-16.04.mini.iso,media=cdrom
memory: 2560
name: unms
net0: virtio=7A:76:F3:9F:6C:CB,bridge=vmbr0
numa: 0
onboot: 1
ostype: l26
scsi0: zfs-local:vm-102-disk-1,size=64G
scsihw: virtio-scsi-pci
smbios1: uuid=3a888b45-4e08-40f8-b64e-4b4ec6714563
sockets: 1

root@pve1:~# qm config 103
balloon: 869
bootdisk: scsi0
cores: 3
ide2: local:iso/Ubuntu-16.04.mini.iso,media=cdrom
memory: 2560
name: ucrm
net0: virtio=AA:B5:7B:4B:24:EB,bridge=vmbr0
numa: 0
onboot: 1
ostype: l26
scsi0: zfs-local:vm-103-disk-1,size=64G
scsihw: virtio-scsi-pci
smbios1: uuid=0f66469f-8106-435f-860c-b93dd3299240
sockets: 1

I should note that I had intermittent issues with NoVNC console when we first set these up. Starting the VM, then immediately hitting console would usually work, but not 100% of the time. That workaround no longer works on either VM.

 

[fireon]

Does it work when you set a fixed memory?
Does it work if you click in the vncscreen and press enter?
Does it work if you send "STRG + ALT + F1" and then use the console?

 

[MimCom]

• Stopped the VM, fixed memory at 2.5 gbytes, restarted. No change.
• Click + enter does not change anything.
• ALT + F1 (from the keyboard) got me a login prompt. Thanks!

 

[fireon]

ALT + F1 (from the keyboard) got me a login prompt. Thanks!

Yes, special ubuntubug, i have this also on PHY machines with an minimal installation.

 

[deafbear]

I solved changing /etc/default/grub removing splash and quiet from GRUB_CMDLINE_LINUX_DEFAULT
Hope this helps

 

[DonMcCoy]

I solved changing /etc/default/grub removing splash and quiet from GRUB_CMDLINE_LINUX_DEFAULT
Hope this helps

for the record, just splash needs to be removed