[Bug 1535763] [NEW] Graphic problem after updating Plasma and sddm

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I just updated my Kubuntu 15.10 64bit (AMD A8-6500T, Mesa 11.0.2) to Plasma 5.5.3 via the Kubuntu Backports PPA.
There was also new version of sddm - old Xsession file been left while asked about replace to the new version.
sddm was updated probably to version 0.13.0-1ubuntu5~ubuntu15.10~ppa1

After reboot - the screen is full with horizontal lines, although everything seems to work.
But - after killing the X by Ctrl-Alt-Backspace and logging in again, with the same user - everything works.

What I tried, without any result:
 * Clearing ~/.cache directory
 * sudo apt-get install -f
 * sudo dpkg --configure -a
 * Rename of Root/usr/share/sddm/scripts Xsession to Xsession.old and Xsession.dpkg-dist to Xsession
 * Renaming Home/ .config and .kde directories
 * Deleting the default user from sddm.conf file in hope to manually login. The result is login screen with horizontal lines.

Attached a picture of the screen after full reboot.
Note the mouse cursor - without lines.

** Affects: kubuntu-meta (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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 Graphic problem after updating Plasma and sddm
https://bugs.launchpad.net/bugs/1535763
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