Public bug reported: I commented on this bug: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1516531 and it was requested I start a new bug with detail.
For what it is worth, I have 15.10 installed on a Thinkpad X1 with an Ivy Bridge processor (i5-3427U) and Intel HD 4000 graphics and I am seeing very similar behavior. Full screen video from Chrome or games on Steam cause the freeze. The freeze is usually when switching away from the video/game or when using the volume keys which causes the onscreen popup to occur. This is new in 15.10. It didn't have this problem when I first upgraded to 15.10 (from 14.04) but seems like it started a couple weeks ago. I seem the have fixed the problem with Chrome by going here: chrome://flags/ and picking "Override software rendering list" but when I start a game it freezes instantly if I hit volume. This appeared in syslog about the same time: Feb 27 20:59:01 x1 org.ayatana.bamf[2406]: ** (bamfdaemon:2434): WARNING **: Got an X error: BadWindow (invalid Window parameter) ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: xorg 1:7.7+7ubuntu4 ProcVersionSignature: Ubuntu 4.2.0-30.36-generic 4.2.8-ckt3 Uname: Linux 4.2.0-30-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Sat Feb 27 21:02:23 2016 DistUpgraded: 2015-11-07 16:32:33,169 DEBUG enabling apt cron job DistroCodename: wily DistroVariant: ubuntu DkmsStatus: vboxhost, 5.0.14, 4.2.0-25-generic, x86_64: installed vboxhost, 5.0.14, 4.2.0-27-generic, x86_64: installed vboxhost, 5.0.14, 4.2.0-30-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:21f9] InstallationDate: Installed on 2015-04-08 (325 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: LENOVO 3443CTO ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-30-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: Upgraded to wily on 2015-11-07 (112 days ago) dmi.bios.date: 09/16/2014 dmi.bios.vendor: LENOVO dmi.bios.version: G6ETA9WW (2.69 ) dmi.board.asset.tag: Not Available dmi.board.name: 3443CTO dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrG6ETA9WW(2.69):bd09/16/2014:svnLENOVO:pn3443CTO:pvrThinkPadX1Carbon:rvnLENOVO:rn3443CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 3443CTO dmi.product.version: ThinkPad X1 Carbon dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.12.2+15.10.20151202-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.64-1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4 version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3 xserver.bootTime: Sat Feb 27 21:01:33 2016 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 898 vendor LGD xserver.version: 2:1.17.2-1ubuntu9.1 ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug compiz-0.9 ubuntu wily -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1550843 Title: Screen freeze when switching from full screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1550843/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp