Comment 16 for bug 1826051

On Mon, May 27, 2019 at 5:25 AM Paul Hawkins <email address hidden> wrote:
>
> Just starting to use QEMU/KVM VMs on Ubuntu 18.04.1 Desktop. Both host
> and quest are same release.

Hi Paul,
I'll answer the first few bits here, but generally this seems to be a
different issue than the bug you replied on.
Not every 100% hang is the same :-)
I'd appreciate if - going further - you'd carry that to a new bug
report instead.

> Today after doing an ubuntu update to 18.04.2 on guest (apt update; apt
> upgrade) and rebooting the VM its display resolution changed to 800x600
> and it cannot be changed as no other resolution is given.
>
> I can repeat this every time:
> 1. clone 18.04.1 vm
> 2. boot clone and check resolution is highest offer of many
> 3. apt update; apt upgrade; reboot
> 4. only 800x600 is avail.
>

I still had a 18.04.1 Desktop guest around.
I cloned it and booted it as is to verify what I had before.
848x480 to 1920x1200
After an Upgrade to 18.04.2 it sees:
848x480 to 1920x1200 (The same list)

So I can not reproduce your issue as-is.
When you open a new bug for this could you please supply for both
good/bad cases these logs from your guest:
- ~/.local/share/xorg/Xorg.0.log
- journalctl -b 0

> Tried updating host to 18.04.2 but did not help. Beside same issue
> above when I log out of guest VM gdm3 display manager screen is not
> shown but only a black screen (user VMM on host to open VM)
>
> Downloaded 18.04.2 iso and created new VM with it and got same issue.
>
> Did see guest cpu at 100% after apt upgrade and then apt install of
> xubuntu desktop.

Seems to be another independent issue of yours, if you happen to file
a bug this is another extra bug please.

>
> I think I read in 18.04.2 QEMU has been upgraded (but maybe only in
> 18.04 server).

No, they all come from the same place in the archive, there is no
updating "update one or the other".
Qemu got plenty of bug and security fixes since it got released in
18.04 - so yes there are some.
But that does not need 18.04.x - you just get it on upgrades.

> At a bit of loss now. I will have to rebuild the host to 18.04.1 and
> start again.
>
> Still new to QEMU/KVM, but not VMs in general. So maybe this is just a
> newbie mistake around correct video config in VMM. I have tried several
> of the others VMM gives but nothing helps.
>

As I said please file extra bugs so that we can leave this one here
alone until new data is found for the issue that really is meant to be
discussed here.