Valentin Nechayev, thank you for reporting this and helping make Ubuntu

Could you please run the following command once from a terminal by ensuring you 
have the package xdiagnose installed, and that you click the Yes button for 
attaching additional debugging information:
apport-collect 1749150

When reporting xorg related bugs in the future, please do so via the
above method. You can learn more about this functionality at

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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  Spontaneous single window freezing

Status in xorg package in Ubuntu:

Bug description:
  Sometimes a window stopped refreshing its contents. Different applications 
affected: known examples include xterm, Firefox, CodeBlocks, KDE lock screen.
  No way found to revive in-time refreshing except full window closing (or 
blind login, in case of KDE lock screen). Keyboard or mouse activity in a such 
window doesn't help.
  A one-shot refresh can be easily caused by switching to another virtual 
desktop and then back. After such switching, a window refresh is active for 
approximately 0.5 seconds, then stops again.
  No relation to host uptime or X session uptime is visible.

  Observed on two different hosts, both carrying Kubuntu 16.04 and
  running XWindow+KDE as desktop environment. KDE is standard Kubuntu
  one. Multiple virtual desktops are used on both hosts.

  The issue started to appear approximately 4-5 months ago but I can't
  specify exact package change that could have caused it. Both hosts are
  regularly updated (no more than 1 week delay).

  The first host has:
  video: 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. 
[AMD/ATI] Turks XT [Radeon HD 6670/7670] (prog-if 00 [VGA controller])
          Subsystem: ASUSTeK Computer Inc. Turks XT [Radeon HD 6670/7670]
          Kernel driver in use: radeon
          Kernel modules: radeon
  CPU: AMD FX-8150
  RAM: 16GB
  Installed as Kubuntu 14.04, upgraded to 16.04 via do-release-upgrade.
  current kernel: linux-image-4.4.0-112-generic
  video packages: non-HWE series (e.g. xserver-xorg=1:7.7+13ubuntu3); active 
driver: radeon

  Issue rate on this host is rather tiny (~1 per week).

  The second one has:
  video: 01:00.0 VGA compatible controller: NVIDIA Corporation Device 128b (rev 
a1) (prog-if 00 [VGA controller])
          Subsystem: Micro-Star International Co., Ltd. [MSI] Device 8c93
          Kernel driver in use: nvidia
          Kernel modules: nvidiafb, nouveau, nvidia_384_drm, nvidia_384
  (really this is GeForce GT 740)
  CPU:Intel i3-4170
  RAM: 16GB
  Installed originally as Kubuntu 16.04
  current kernel: linux-image-4.13.0-32-generic (depended on by 
  video packages: HWE series (e.g. 
xserver-xorg-hwe-16.04=1:7.7+16ubuntu3~16.04.1); active driver: nvidia 
(proprietary), but the same issue observed with VESA driver.

  Issue rate on this host is 1-2 per day and was much higher with VESA
  driver in use.

  No respective messages are found in Xorg.*.log or ~/.xsession-errors,
  but the latter has got stream of messages like:

  at host with AMD and Radeon:
  kscreen: Primary output changed from KScreen::Output(Id: 86 , Name: "HDMI-0" 
) ( "HDMI-0" ) to KScreen::Output(Id: 86 , Name: "HDMI-0" ) ( "HDMI-0" )
  kscreen: Primary output changed from KScreen::Output(Id: 86 , Name: "HDMI-0" 
) ( "HDMI-0" ) to KScreen::Output(Id: 86 , Name: "HDMI-0" ) ( "HDMI-0" )

  at host with Intel and Nvidia:
  kscreen: Primary output changed from KScreen::Output(Id: 640 , Name: 
"DVI-D-0" ) ( "DVI-D-0" ) to KScreen::Output(Id: 640 , Name: "DVI-D-0" ) ( 
"DVI-D-0" )
  kscreen: Primary output changed from KScreen::Output(Id: 640 , Name: 
"DVI-D-0" ) ( "DVI-D-0" ) to KScreen::Output(Id: 640 , Name: "DVI-D-0" ) ( 
"DVI-D-0" )

  such messages started appearing approximately at the same time, plus-
  minus 1-2 months.

  Additional info can be provided on demand.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Uname: Linux 4.4.0-112-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Tue Feb 13 11:47:32 2018
  InstallationDate: Installed on 2014-12-16 (1154 days ago)
  InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
  SourcePackage: xorg
  UpgradeStatus: Upgraded to xenial on 2017-03-29 (321 days ago)

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