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[Lorenzo Bettini <1509556@xxxxxxxxxxxxxxxxxx>]

I'm experiencing a similar problem after upgrade to Kubuntu Wily, though
in my case I have flickering when setting a lower resolution
(https://bugs.launchpad.net/ubuntu/+source/plasma-desktop/+bug/1514167).
The flickering makes the system quite unusable. I also tried to set the
UXA acceleration but that does not help (it actually makes things even
worse: slower and flickering does not go away).

The problem is with the current kernel

4.2.0-17-generic #21-Ubuntu SMP Fri Oct 23 19:56:16 UTC 2015 x86_64
x86_64 x86_64 GNU/Linux

Switching to the old kernel on boot SOLVES the problem of flickering and
things are usable again:

3.19.0-32-generic #37-Ubuntu SMP Wed Oct 21 10:23:06 UTC 2015 x86_64
x86_64 x86_64 GNU/Linux

This is my card:

sudo lshw -c video
  *-display
       description: VGA compatible controller
       product: 4th Gen Core Processor Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 06
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:33 memory:f7400000-f77fffff memory:d0000000-dfffffff ioport:f000(size=64)

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https://bugs.launchpad.net/bugs/1509556

Title:
  Kubuntu Wily upgrade screen glitch with  4.2 kernel

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  On  recent  update   from  15.04   to  15.10, the new  4.2  kernel  is  associated   with    graphics  instability after  a  few  seconds of   GUI  use   with  mouse   and   keyboard making  the  GUI  unusable.  See  another  person's  same  experience   with  intel   graphics   here:  
  askubuntu.com/questions/688649/kubuntu-wily-upgrade-screen-glitch

  Downgrading  to the  last   15.04    kernel   solves  my  issue.
   
  See  result  of   ubuntu-bug linux   from  the  terminal attached.
  --- 
  ApportVersion: 2.19.1-0ubuntu3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bryan      2415 F.... pulseaudio
  CurrentDesktop: LXDE
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=29d7b701-8e5f-4cd6-8cfb-be150e1ea27f
  InstallationDate: Installed on 2012-09-26 (1122 days ago)
  InstallationMedia: Lubuntu 12.04 "Precise Pangolin" - Release i386 (20120423)
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  MachineType: Dell Inc. OptiPlex GX280
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=5658fec6-3afb-4e3e-b668-812316cc9ca6 ro quiet splash
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-16-generic N/A
   linux-backports-modules-4.2.0-16-generic  N/A
   linux-firmware                            1.149
  RfKill:
   
  Tags:  wily
  Uname: Linux 4.2.0-16-generic i686
  UpgradeStatus: Upgraded to wily on 2015-10-23 (0 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/29/2005
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0FG113
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 15
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd11/29/2005:svnDellInc.:pnOptiPlexGX280:pvr:rvnDellInc.:rn0FG113:rvr:cvnDellInc.:ct15:cvr:
  dmi.product.name: OptiPlex GX280
  dmi.sys.vendor: Dell Inc.

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