Here are the details from apport-bug, as promised (copied from #1764211 because I had to use a different Launchpad account):
ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.4.0-119.143-generic 4.4.114 Uname: Linux 4.4.0-119-generic x86_64 .tmp.unity_support_test.0: ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 BootLog: /dev/sda1: clean, 257395/9510912 files, 1925432/38014720 blocks CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true Date: Sun Apr 15 18:28:07 2018 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu EcryptfsInUse: Yes ExtraDebuggingInterest: Yes GpuHangFrequency: Several times a week GpuHangReproducibility: Occurs more often under certain circumstances GpuHangStarted: Immediately after installing this version of Ubuntu GraphicsCard: Advanced Micro Devices, Inc. [AMD/ATI] RV516 [Radeon X1300/X1550 Series] [1002:7187] (prog-if 00 [VGA controller]) Subsystem: PC Partner Limited / Sapphire Technology RV516 [Radeon X1300/X1550 Series] [174b:e020] Subsystem: PC Partner Limited / Sapphire Technology RV516 [Radeon X1300/X1550 Series] (Secondary) [174b:e021] InstallationDate: Installed on 2017-07-24 (265 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) ProcEnviron: LANGUAGE=en_CA:en TERM=xterm-256color PATH=(custom, no user) LANG=en_CA.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-119-generic root=UUID=fe381ac7-304a-4c28-b497-bdefa6602251 ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display Title: Xorg freeze UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/24/2007 dmi.bios.vendor: LENOVO dmi.bios.version: 2JKT30AUS dmi.board.name: LENOVO dmi.chassis.vendor: LENOVO dmi.modalias: dmi:bvnLENOVO:bvr2JKT30AUS:bd01/24/2007:svnLENOVO:pn8811BJ8:pvrThinkCentreM55:rvnLENOVO:rnLENOVO:rvr:cvnLENOVO:ct7:cvr: dmi.product.name: 8811BJ8 dmi.product.version: ThinkCentre M55 dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.83-1~16.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~16.04.1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~16.04.1 version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.7 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1.2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2 xserver.bootTime: Sun Apr 15 17:45:51 2018 xserver.configfile: default xserver.devices: input Power Button KEYBOARD, id 6 input Power Button KEYBOARD, id 7 input Dell Dell USB Keyboard KEYBOARD, id 8 input USB Optical Mouse MOUSE, id 9 xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.18.4-0ubuntu0.7 xserver.video_driver: radeon ** Tags added: amd64 apport-bug compiz-0.9 freeze ubuntu xenial -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank Status in linux package in Ubuntu: Incomplete Status in xorg package in Ubuntu: New Bug description: I maintain a set of older kiosks running a mix of stock Ubuntu 14.04 LTS and 16.04. As we have gradually transitioned them to 16.04, we have noticed that the machines running 16.04.1 now regularly exhibit problems restoring from the blank screen which appears after a period of inactivity. This only occurs on the machines where we've installed 16.04. All of the 16.04.1 installations are "fresh", that is, complete re-installs from scratch, and we install all security and other updates on a regular basis. This problem has persisted right from the beginning when we started using 16.04. Following a period of user inactivity, the screen goes blank; this is, of course, expected. When the user tries to restore the session by typing a key or moving the mouse, one of three outcomes occurs. Sometimes, the session restores normally. Other times, the screen remains blank regardless of all normal keyboard input, until a magic SysRq sequence is performed. After Alt-SysRq-k, either the virtual console resets to a login screen (as expected after this SysRq sequence), or we get a kernel panic text screen (see attached screen photo) and can only restore via a hard power-cycle reboot. I will continue to try to capture a better trace output from one of these conditions, perhaps from /var/log/kern.log or by installing linux-crashdump (although these old machines may not have enough memory for the stock package). But in the meantime, I'm attaching a photo of the kernel panic we see, which suggests a problem may reside in the Radeon driver ... which would seem possible, given the general blank-screen no-resume problem on these systems. Any advice on how to further capture any other needed details would be appreciated. Thanks very much! 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