Description of problem: QXL can no longer automatically adjust screen resolution with very vanilla kernel whether distro provided or compiled past 3.16. This should be visible on every virtualized guest setup but I will specify the environment I run just in case its not reproducible: Debian stable (Jessie) i386 guest, Wih KDE desktop environment. Running a kernel greater than 3.16. A workaround is to disable KMS but that is a very ugly workaround. Also in the case of hardened kernels comes at a price of reduced protection. Reference: https://forums.grsecurity.net/viewtopic.php?f=3&t=4449#p16533
The solution is to implement handling of the monitor hotplug event in the window manager of KDE, like GNOME did in mutter and gnome-settings-daemon (I don't think Fedora is correct product for Debian)
So should I report it to KDE then? > (I don't think Fedora is correct product for Debian) I tried looking for an "other distro" label but couldn't find one.
(In reply to bancfc from comment #2) > So should I report it to KDE then? yes the GNOME bugs related to the issue: https://bugzilla.gnome.org/show_bug.cgi?id=711216 https://bugzilla.gnome.org/show_bug.cgi?id=702804#c9 see also these bugs for more info: https://bugzilla.redhat.com/show_bug.cgi?id=1153709 https://bugzilla.redhat.com/show_bug.cgi?id=1290586 > > > (I don't think Fedora is correct product for Debian) > > I tried looking for an "other distro" label but couldn't find one. upstream bugzilla of the component is more appropriate when the problem is not specific to a distro: https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
Reported to KDE and got a reply from Martin Gräßlin: https://bugs.kde.org/show_bug.cgi?id=370494#c1 Although he will look at fixing it it's his opinion that the best solution would be to implement the code in virt-viewer for generic cross-DE compatibility.
thanks, but it is a purely guest issue - so cannot be fixed in virt-viewer
This used to be handled in spice-vdagent, but changed when the kernel kms qxl driver was introduced. Your desktop environment is going to be watching for new monitors appearing, it's going to try to remember their preferred resolution/position/..., having another program (spice-vdagent) trying to configure things on its own is very likely to be conflicting with that, and to cause some weird corner cases. So the decision was made to let the desktop environment handle this as it has full knowledge of what it wants to do with the screens.
Thanks Pavel for taking this up with the KDE guys.
Per https://bugs.kde.org/show_bug.cgi?id=370494#c17 is fixed upstream -> reassigning to KDE component
Quoting upstream bug "So git master has all the patches in place, and I'll look into backporting these bits to Plasma 5.8.4."
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