Valentin Nechayev, thank you for reporting this and helping make Ubuntu better.
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 https://wiki.ubuntu.com/ReportingBugs. ** Changed in: xorg (Ubuntu) Importance: Undecided => Low ** Changed in: xorg (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1749150 Title: Spontaneous single window freezing Status in xorg package in Ubuntu: Incomplete 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 linux-generic-hwe-16.04) 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 (20140722.2) SourcePackage: xorg UpgradeStatus: Upgraded to xenial on 2017-03-29 (321 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1749150/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
