[Bug 97354] After update to kernel 4.7-1 plasma won't login

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97354

--- Comment #14 from Mike C <mike.cloaked at gmail.com> ---
I tried something new today with this - after updating and booting the 4.7
kernel and entering the login details to the sddm greeter, the usual hang time
with the splash image on the screen eventually times out and gives just a
desktop background image - at that point I used right click to unlock the
widgets on the desktop, and added a new default panel which displays and works
correctly. 

If at that point I logout and then log back in, then the splash screen hangs
for the same extended period, and when it disappears the panel that I added
after the previous login is no longer displayed, and again just a desktop
background image is on the screen.  

However, if I then log out using right click and selecting to leave plasma, and
downgrade the kernel back to 4.6 which was previously working, and log back in
to plasma, which works successfully again, then the login does show the new
panel that I added when I had booted kernel 4.7 - which I can then remove and
the original panel is there and working as normal!

I don't know therefore if this might point to a bug in plasma workspace or kwin
that has surfaced with the current version of the kernel 4.7, and which might
be fixed in newer versions of plasma, or when plasma 5.8 is released?

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