Bug 1353170

This bug (or what appears to be this bug) still exists in Fedora 25, except that the workaround listed above does not work.

It boots up in the Xen hvm, and ends up on a grey screen with three small rectangles in the middle about 2/3 of the way down. Then it shows a few lines of bootup messages ending with "[  OK  ] Started User Manager for UID 42." and then hangs. I cannot get any response from the console (accessible via VNC because it is a Xen VM), but I am able to SSH to it without issue, even when the console appears to have hung.

If I add the number "3" to the grub bootup command then it boots into text mode successfully and the VNC console is perfectly usable in text mode.

I have tried it with the following video lines in the Xen XML config...
    <model type='cirrus' vram='9216' heads='1'/>
    <model type='vga' vram='9216' heads='1'/>
    <model type='qxl' ram='65536' vram='9216' heads='1'/>
and the symptoms have not changed.

I have edited /etc/gdm/custom.conf and uncomented the Waylanddisable line...
    WaylandEnable=false
but the problem remains.

Note that even with the line mentioned above uncommented, it still appears to run wayland, because when it has hung I have SSHed into it and found the following processes with "ps -aux"
#ps aux | grep -i wayland
gdm        924  0.0  0.5 449880 11004 tty1     Ssl+ 09:48   0:00 /usr/libexec/gdm-wayland-session gnome-session --autostart /usr/share/gdm/greeter/autostart
gdm       1020  0.0  1.4 211160 29504 tty1     Sl+  09:48   0:00 /usr/bin/Xwayland :1024 -rootless -noreset -listen 4 -listen 5 -displayfd 6
root      1313  0.0  0.0 119372   904 pts/0    S+   10:01   0:00 grep --color=auto -i wayland


The complete Xen XML config is as follows...
[root@host1 ~]# virsh dumpxml F25Test
<domain type='xen' id='17'>
  <name>F25Test</name>
  <uuid>526c8d27-72c4-4fef-9cd0-cb42707efaf4</uuid>
  <memory unit='KiB'>2097152</memory>
  <currentMemory unit='KiB'>2097152</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <os>
    <type arch='x86_64' machine='xenfv'>hvm</type>
    <loader type='rom'>/usr/lib/xen/boot/hvmloader</loader>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='variable' adjustment='0' basis='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <disk type='block' device='disk'>
      <driver name='phy'/>
      <source dev='/dev/array1/LVF25Test'/>
      <backingStore/>
      <target dev='xvda' bus='xen'/>
    </disk>
    <interface type='bridge'>
      <mac address='02:00:00:16:00:00'/>
      <source bridge='br100'/>
      <script path='vif-bridge'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='vnc' port='5925' autoport='no' listen='192.168.131.5'>
      <listen type='address' address='192.168.131.5'/>
    </graphics>
    <video>
      <model type='qxl' ram='65536' vram='9216' heads='1'/>
    </video>
  </devices>
</domain>

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