Comment 48 for bug 1550779

I just took some updates to a number of graphic libraries on 16.04, and now I can't login to kubuntu. The symptom is that it takes my password on the greeter screen, but never updates the screen after that.

The messages include these apparently related kernel messages:
kernel: [ 701.564034] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B
kernel: [ 701.564054] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

It is, of course, unclear whether these libraries triggered the kernel bug or if this is unrelated to the kernel bug. I attached it here because this is what I noticed first.

I'm currently running kernel 4.4.0-36.

Here are my most recent updates. The problem started after I rebooted. Of course that was the next time I logged in too...

Start-Date: 2016-09-07 08:46:04
Commandline: /usr/bin/unattended-upgrade
Remove: libcdaudio1:amd64 (0.99.12p2-14), linux-image-extra-4.2.0-36-generic:amd64 (4.2.0-36.42), linux-image-extra-4.4.0-22-generic:amd64 (4.4.0-22.40), gtk2-engines-murrine:amd64 (0.98.2-0ubuntu2.1), linux-image-extra-4.4.0-24-generic:amd64 (4.4.0-24.43), libslv2-9:amd64 (0.6.6+dfsg1-3build1), linux-image-extra-4.4.0-28-generic:amd64 (4.4.0-28.47), linux-image-extra-4.4.0-31-generic:amd64 (4.4.0-31.50), libfaac0:amd64 (1.28+cvs20151130-1)
End-Date: 2016-09-07 08:48:13

Start-Date: 2016-09-07 16:42:27
Install: libgnome-keyring-common:amd64 (3.12.0-1build1, automatic), libgnome-keyring0:amd64 (3.12.0-1build1, automatic)
Upgrade: libgles2-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libgles1-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libglapi-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libglapi-mesa:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), p11-kit:amd64 (0.23.2-3, 0.23.2-5~ubuntu16.04.1), libxatracker2:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libegl1-mesa-drivers:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libegl1-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libegl1-mesa:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), p11-kit-modules:amd64 (0.23.2-3, 0.23.2-5~ubuntu16.04.1), libgbm1:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libgbm1:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), cups-filters:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1), chromium-browser:amd64 (51.0.2704.79-0ubuntu0.16.04.1.1242, 52.0.2743.116-0ubuntu0.16.04.1.1250), libcupsfilters1:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1), chromium-codecs-ffmpeg-extra:amd64 (51.0.2704.79-0ubuntu0.16.04.1.1242, 52.0.2743.116-0ubuntu0.16.04.1.1250), libwayland-egl1-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libfontembed1:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1), libgl1-mesa-dri:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libgl1-mesa-dri:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), cups-filters-core-drivers:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1), libgl1-mesa-glx:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libgl1-mesa-glx:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libp11-kit0:amd64 (0.23.2-3, 0.23.2-5~ubuntu16.04.1), libp11-kit0:i386 (0.23.2-3, 0.23.2-5~ubuntu16.04.1), mesa-vdpau-drivers:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), chromium-browser-l10n:amd64 (51.0.2704.79-0ubuntu0.16.04.1.1242, 52.0.2743.116-0ubuntu0.16.04.1.1250), ubuntu-mono:amd64 (14.04+16.04.20160621-0ubuntu1, 14.04+16.04.20160804-0ubuntu1), cups-browsed:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1)
End-Date: 2016-09-07 16:44:34

Start-Date: 2016-09-12 14:31:39
Commandline: /usr/sbin/synaptic
Requested-By: alanr (1000)
Upgrade: snapd:amd64 (2.13, 2.14.2~16.04), libappstream-glib8:amd64 (0.5.13-1ubuntu2, 0.5.13-1ubuntu3), neo4j:amd64 (3.0.4, 3.0.5), accountsservice:amd64 (0.6.40-2ubuntu11.1, 0.6.40-2ubuntu11.2), libaccountsservice0:amd64 (0.6.40-2ubuntu11.1, 0.6.40-2ubuntu11.2)
End-Date: 2016-09-12 14:32:17