kernel crashes compiz setuid error

[Phil]

Hi,
use a Lenovo T450 with ubuntu 14.04 with kernel 3.19.0-33
now
Ubuntu 4.4.0-34.53~14.04.1-generic 4.4.15

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty

after update
then 3 problems:
-screen flashing .. nightmare
-got in /var/log/syslog
  kernel: [ 175.237576] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
-compiz: pam_ecryptfs: seteuid error

Thanks for any help.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.4.0-34-generic 4.4.0-34.53~14.04.1
ProcVersionSignature: Ubuntu 4.4.0-34.53~14.04.1-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
NonfreeKernelModules: symap_custom_dkms_x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Aug 30 20:04:34 2016
InstallationDate: Installed on 2015-11-30 (274 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: linux-lts-xenial
UpgradeStatus: No upgrade log present (probably fresh install)

[Phil (ph35sm)]

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