[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Martin Gräßlin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #18 from Martin Gräßlin  ---
All right that might explain it. I only tested with Cirrus so far as I had some
bug reports regarding Cirrus to fix as well. Will try again with QXL.

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[OlafLostViking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #17 from OlafLostViking  ---
You did check the setting in the menu mentioned in comment #14?

I just tried all the GPUs available in KVM/virt-manager in Neon:
* QXL: see above
* Virtio: won't work with Neon, but in other distributions it behaves like QXL
* Cirrus: does not report the true window resolution "to xrandr"
* VGA: offers 800x600 as the only resolution available, no matter the host
window size
* VMVGA: lots of funny effects/flickering, locks up(!) after ksplash
* Xen: doesn't come up at all

To summarize: I'd say that for now QXL and in the long run Virtio are the two
relevant GPUs for a Linux/KDE desktop in a KVM VM. The others are probably not
that important for KWin (just my personal opinion!)?

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Martin Gräßlin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #16 from Martin Gräßlin  ---
no dice, also with X11 it doesn't do any changes to xrandr. Does one need to do
anything else? Specific GPU in kvm, or something like that?

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Martin Gräßlin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #15 from Martin Gräßlin  ---
I have now started spice-vdagent inside the VM (that was missing) and checked
the auto resize option. But I still don't get any changes regarding the xrandr
output - might be related to me running Wayland. Looks like virt-manager
overall is not Wayland ready.

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[OlafLostViking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #14 from OlafLostViking  ---
Oh, and it seems you have to select `View -> Scale Display -> Auto resize VM
with window` in the virt-manager window.

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[OlafLostViking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #13 from OlafLostViking  ---
Are you using spice in the virt-manager and ran spice-vdagent inside of the VM?
The spice protocol is the one responsible for the integration of host and
guest. In Neon it is in universe/x11.

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Martin Gräßlin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #12 from Martin Gräßlin  ---
I now have a VM running through virtmanager. But I don't understand how I can
resize the VM window. If I resize the window it does not affect xrandr at all.
There are no changes. Any ideas what I do wrongly?

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Martin Gräßlin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #11 from Martin Gräßlin  ---
Not the result I expected, but also helps. It looks like the resolution
changes, but our software stack does not react on it. That must be an XRandR
event we don't handle yet.

Well I need to create a VM for another bug anyway, so can investigate.

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[OlafLostViking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #10 from OlafLostViking  ---
> Could you run xrandr before and after resizing the VM window and diff the 
> change?

Sure thing (using Neon):

# after booting in a VM window with 1280x720, internal resolution 1280x720
after login
$ xrandr > xrandr.before
$ qdbus org.kde.KWin /KWin supportInformation > qdbus.before
# increasing VM window size, no touching internal settings
$ xrandr > xrandr.bigger
$ qdbus org.kde.KWin /KWin supportInformation > qdbus.bigger
# decreasing VM window size, no touching internal settings
$ xrandr > xrandr.smaller
$ qdbus org.kde.KWin /KWin supportInformation > qdbus.smaller
$ diff xrandr.before xrandr.bigger 
3c3
<1280x720  59.86*+
---
>1512x893  59.84 +
13a14
>1280x720  59.86* 
$ diff xrandr.before xrandr.smaller
3c3
<1280x720  59.86*+
---
>1064x664  59.86 +
13a14
>1280x720  59.86* 
$ diff qdbus.before qdbus.bigger 
$ diff qdbus.before qdbus.smaller

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Martin Gräßlin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #9 from Martin Gräßlin  ---
> Changing the size of the outer VM window does _not_ alter the output of the
qdbus query

This is very interesting. This means that we don't get an xrandr update when
the window changes. Which would explain everything here.

Could you (no need to do on multiple distributions) run xrandr before and after
resizing the VM window and diff the change? My assumption is that the Screen 0
changes.

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[OlafLostViking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #8 from OlafLostViking  ---
=== Setup ===

The following steps have been tried on these installations within a libvirt/KVM
VM:
- Neon (user): Qt 5.7.0, KWin/Plasma 5.7.0, kf5 5.24, QXL (Virtio doesn't even
reach X11/SDDM)
- Archlinux (kf5-only): Qt 5.7.0, KWin/Plasma 5.7.0, kf5 5.23, QXL as well as
Virtio
- Manjaro (KDE): Qt 5.7.0, KWin/Plasma 5.6.5, kf5 5.23, QXL
- openSUSE (Tumbleweed): Qt 5.6.1, KWin/Plasma 5.6.4, kf5 5.23, QXL as well as
Virtio

All were updated to use the repository packages of today (2016-07-11) and
rebooted while having 1280x720 set as desktop resolution.


=== Booting ===

They boot into a default sized (1024x768) SDDM, which doesn't react on VM
window changes (unlike f.ex. GDM that I tested before in another VM, see
comment #2). After logging in, Plasma/KSplash adjusts to the resolution of the
last session. (At least most of the times... I finally gave up for now finding
a pattern - I guess using xrandr vs kscreen makes a difference... But that's
probably for another bug report one day ;-) )


=== QDbus ===

Output of the qdbus command after login:

```[olaflostviking@valhalla ~]$ qdbus org.kde.KWin /KWin supportInformation |
grep -A7 Screens
```Screens
```===
```Multi-Head: no
```Active screen follows mouse:  yes
```Number of Screens: 1
```
```Screen 0:
```-
```Name: Virtual-1   ### index depends on distribution
```Geometry: 0,0,1280x720
```Refresh Rate: 60 ### exact frequency differs on distributions

Changing the size of the outer VM window does _not_ alter the output of the
qdbus query (`diff`ed the whole output). Using kscreen to change the resolution
works as mentioned before. The output of the qdbus query changes at the
"Geometry" entry only.


=== xrandr ===

With `xrandr --output Virtual-1 --mode 1280x720` I can switch to the desired
resolution, too. This is correctly shown by a following `xrandr` (including *
and +) as well as in the `qbus...` query on KWin (just to make it clear: the
outer window size of the VM is correctly reflected by `xrandr` only but not the
`qdbus` output).


Thanks for having a look!

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Martin Gräßlin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

Martin Gräßlin  changed:

   What|Removed |Added

 CC||mgraess...@kde.org

--- Comment #7 from Martin Gräßlin  ---
two questions:
1) Can you check with 
qdbus org.kde.KWin /KWin supportInformation

Whether KWin gets the resolution change correctly

2) Can you try changing the resolution through xrandr manually to see whether
that gets applied correctly?

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[OlafLostViking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

OlafLostViking  changed:

   What|Removed |Added

Version|5.6.0   |master
   Platform|Archlinux Packages  |Neon Packages

--- Comment #6 from OlafLostViking  ---
Now that KDE is offering the "official" NEON packages I thought I should give
them a try to rule out distribution/packaging problems.

So I installed the NEON git stable image of today via ubiquity, updated it with
an "apt-get update"/"apt-get upgrade" and added "spice-vdagent" to it:

* neon-desktop (4+p16.04+git20160415.1334)
* kwin (4:5.6.2+p16.04+git20160415.0003-0)
* plasma-framework (5.21.0+p16.04+git20160416.0014-0)
* sddm (0.13.0-1ubuntu5)

This bug report is also valid for this installation.

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Mike Goodwin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #5 from Mike Goodwin  ---
This affects me on Fedora 23 host/guest scenario with a F23 KDE Plasma 5 guest.
GNOME guest of the same type works correctly. I can essentially confirm what
@OlafLostViking has written.

I am particularly interested in this because I use virt-manager/kvm/libvirt as
a replacement for VMware/VirtualBox and I consider it a basic guest
functionality.

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Mike Goodwin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

Mike Goodwin  changed:

   What|Removed |Added

 CC||m...@mgoodwin.net

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[OlafLostViking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

OlafLostViking  changed:

   What|Removed |Added

Version|5.5.1   |5.6.0

--- Comment #4 from OlafLostViking  ---
Still valid for 5.6.0

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[Aleix Pol via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

Aleix Pol  changed:

   What|Removed |Added

  Component|general |Multi-screen support
   Assignee|k...@davidedmundson.co.uk|aleix...@kde.org
 CC||aleix...@kde.org

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[OlafLostViking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

--- Comment #3 from OlafLostViking  ---
Can I provide any more details of should I try out other things?

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[David Edmundson via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

David Edmundson  changed:

   What|Removed |Added

 Resolution|--- |WAITINGFORINFO
 Status|UNCONFIRMED |NEEDSINFO

--- Comment #1 from David Edmundson  ---
If you type "xrandr -q" does that show the updated size?

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[plasmashell] [Bug 356864] Plasma cannot adapt to VM host window

[OlafLostViking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356864

OlafLostViking  changed:

   What|Removed |Added

 Resolution|WAITINGFORINFO  |---
 Status|NEEDSINFO   |UNCONFIRMED

--- Comment #2 from OlafLostViking  ---
Yes, it does. In the example down below I manually set the resolution in
kscreen to 1280x720) and resized the window - the new resolution seems to be
always the value appearing first in the list. In "virt-manager" the check box
"View->Scale Display->Auto resize VM with window" is active.

When I open the kscreen config now, 1024x768 is preselected in the dropdown and
the "strange" resolution of my VM window is not selectable/shown in the list.

Just to be very sure it's not a driver problem in my KDE VM, I just installed
the "plasma" package group in my dedicated (working) GNOME VM (so everything is
up-to-date [SDDM 0.13.0, Plasma 5.5.1, Frameworks 5.17.0 and Apps 15.12.0]
without any old KDE libs/config etc.) and tried logging into Plasma via GDM as
well as SDDM. The results are the same:

* GDM adapts, Plasma starts in the "correct" resolution set by GDM but doesn't
adapt anymore.
* When booting with SDDM as display manager, it's already starting in a wrong
resolution. A started GNOME session corrects the resolution and adapts, a
Plasma session stays "wrong" and won't adapt either.


[olaflostviking@kessel ~]$ xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 720, maximum 8192 x 8192
Virtual-0 connected primary 1280x720+0+0 0mm x 0mm
   1216x591  59.72 +
   1920x1200 59.88  
   1920x1080 59.96  
   1600x1200 59.87  
   1680x1050 59.95  
   1400x1050 59.98  
   1280x1024 59.89  
   1440x900  59.89  
   1280x960  59.94  
   1280x854  59.89  
   1280x800  59.81  
   1280x720  59.86* 
   1152x768  59.78  
   1024x768  59.92  
   800x600   59.86  
   848x480   59.66  
   720x480   59.71  
   640x480   59.38  
Virtual-1 disconnected
Virtual-2 disconnected
Virtual-3 disconnected
[olaflostviking@kessel ~]$

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