[Bug 97354] New: 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

            Bug ID: 97354
           Summary: After update to kernel 4.7-1 plasma won't login
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: mike.cloaked at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 125794
  --> https://bugs.freedesktop.org/attachment.cgi?id=125794&action=edit
Journal log with kernel 4.7-1 using intel driver

I have a desktop machine (Intel Ivybridge DQ77KB ) and running Arch linux.
After update to kernel 4.7.0-1 with the usual pacman -Syu my desktop initially
boots up fine and presents the sddm greeter screen as normal - but when logging
in the usual splash screen appears on the monitor with the progress bar moving
across, but at around 90% through this process, the plasma login seems hangs
for many seconds - eventually the splash screen disappears and I end up with
just the desktop background image - but no taskbar, and the mouse becomes
active again after being unavailable whilst the progress bar and splash are on
the screen. Once the mouse is active again and I can select the usual options
with right click including the logout option. Rebooting makes no difference,
and logging out and back in also makes no difference.

Downgrading the kernel back to 4.6.4-1-ARCH allows my plasma desktop to login
normally again - so this looks like a possible bug in the 4.7 kernel Intel
driver.

I ran some more tests. If I update to kernel 4.7-1, and then remove the
xf86-video-intel package and remove the file /etc/X11/xorg.conf.d/20-intel.conf
so that the system uses the modesetting driver instead of the intel driver then
the system boots to a normal graphical sddm login screen and logging in
completes to give a normal plasma desktop including the taskbar. However the
Kickoff menu opens in a strange way with it seems items off the left of the
screen so that they are not accessible. Also if I start the chrome browser it
appears to start but is not on the screen - again possibly it is trying to
place the chrome window outside of the screen area. So although the graphics
partly works it is not usable. 

The versions of key packages are:
xorg-server 1.18.4-1 (xorg)
xf86-video-intel 1:2.99.917+691+ga77397a-1 (xorg-drivers xorg)

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