[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
After several weekends of testing, I believe I can report with high confidence that the kernel update to 4.17-rc2 fixes the second of the two problems; specifically, we no longer see kernel crashes after using Alt-SysRq-k to recover from frozen/hanging blank screens. However, the unable-to-unblank problem remains; after normal screen blanking, about 50% of the time we are unable to recover by moving the cursor or typing a key. Instead, only Alt-SysRq-k allows us to recover back to a guest login screen. There doesn't seem to be much in the system logs that I can find, except possibly this: May 20 20:41:04 Comprm8 gnome-session[7919]: gnome-session-binary[7919]: GLib-GIO-CRITICAL: g_dbus_connection_call_internal: assertion 'object_path != NULL && g_variant_is_object_path (object_path)' failed May 20 20:41:04 Comprm8 gnome-session-binary[7919]: GLib-GIO-CRITICAL: g_dbus_connection_call_internal: assertion 'object_path != NULL && g_variant_is_object_path (object_path)' failed Some seemingly similar bug reports from out in the wild: https://askubuntu.com/questions/795014/ubuntu-16-04-occasionally-hangs-with-screen-off-after-switching-ttys-or-turning https://askubuntu.com/questions/949764/ubuntu-hangs-when-unlocking-screen Can you recommend any approaches to help debug the root cause of this problem, presumably in X and/or the radeon driver? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
Yes, I can test those this weekend ... if you have any specific advice on updating the kernel, let me know, otherwise I'll use the notes here: https://wiki.ubuntu.com/Kernel/MainlineBuilds Thanks very much! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
Hit another kernel panic this weekend, again after having the screen go blank and be unblankable via any normal method, then trying Alt-SysRq-k and getting this panic (with a different stacktrace than the other, but also going through the radeon driver and radeon_crtc_handle_flip). I'll try to get the kern.log file matching this panic next weekend. ** Attachment added: "radeon_kernel_panic2.jpg" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5126315/+files/radeon_kernel_panic2.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
I think I've filled in all the necessary info -- and I have another screenshot to upload too, once I get it off my phone, from another kernel panic in the same context. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
One further historical detail: when these machines were running 14.04.3 and we made the mistake of accepting the HardWare Enablement (HWE) upgrade: https://wiki.ubuntu.com/1404_HWE_EOL which replaced the old fglrx driver with the radeon one, that's when we first encountered this unable-to-unblank problem. Fortunately, at that time we were able to roll back Xorg to 1.16 and keep things sort-of working: https://askubuntu.com/questions/815591/ubuntu-14-04-5-16-04-and-newer-on-amd-graphics https://askubuntu.com/questions/676216/downgrade-xorg-server When we performed a clean, full re-install with 16.04 we were hoping this problem would be resolved, but as I've documented here it continues to affect the systems. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
OK ... I think that's all I can do for today. I've uploaded as attachments to this original report all the files generated by apport- bug today, and marked the other ticket as a duplicate. (I apologize for that, but I can't use my personal Launchpad account from the kiosks, and I'm only there once a week, so I used the "RBL Admin" account to generate the requested apport-bug files. I've marked the extra ticket as a duplicate of this one now that I've copied over all the files.) As I noted earlier when I had direct access to the machines, this seems to be a pair of issues, both possibly in the Radeon driver. The "unable to unblank after idle" problem is shown in the Xorg.0.log file from today, and also in the XorgLogOld.txt file from apport-bug -- namely, Xorg errors reporting keyboard and mouse events are being dropped. And, when we do a "hard resume" by issuing Alt-SysRq-k, that sometimes works to get back to the login screen, and sometimes generates a kernel crash in the radeon driver -- as shown in the apr1.full.kern.log (all the /var/log/kern.log* entries from April 1st) and the accompanying kernel stacktrace photo in radeon_kernel_panic1.jpg. Please let me know if there's any further data I can try to collect next week when I'm on-site again. Thanks very much, Chris. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "Xrandr.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117664/+files/Xrandr.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "xdpyinfo.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117665/+files/xdpyinfo.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "XorgLog.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117662/+files/XorgLog.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "LightdmLog.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117670/+files/LightdmLog.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "XorgLogOld.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117663/+files/XorgLogOld.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "xserver.outputs.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117666/+files/xserver.outputs.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "ProcCpuinfoMinimal.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117656/+files/ProcCpuinfoMinimal.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "ProcInterrupts.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117657/+files/ProcInterrupts.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "UdevDb.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117660/+files/UdevDb.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "UnitySupportTest.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117661/+files/UnitySupportTest.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "ProcModules.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117658/+files/ProcModules.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "JournalErrors.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117651/+files/JournalErrors.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "Dependencies.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117629/+files/Dependencies.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "ProcCpuinfo.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117655/+files/ProcCpuinfo.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "CurrentDmesg.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117628/+files/CurrentDmesg.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "Lsusb.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117654/+files/Lsusb.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "Lspci.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117653/+files/Lspci.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "LightdmDisplayLog.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117652/+files/LightdmDisplayLog.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Attachment added: "DpkgLog.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117630/+files/DpkgLog.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
I'm only on-site with these kiosks once a week, but the next time I'm there I will run apport-collect on one of the affected systems, and see if we can't capture the problem. I'll also investigate whether there are any messages in kernel log files, as best I can. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] Re: kernel panic in Radeon driver while screen blank
** Description changed: 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 16.04.3 now regularly exhibit problems + 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 16.04.3 installations are "fresh", that is, complete re-installs + 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! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1763273] [NEW] kernel panic in Radeon driver while screen blank
Public bug reported: 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 16.04.3 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 16.04.3 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! ** Affects: ubuntu Importance: Undecided Status: New ** Attachment added: "radeon_kernel_panic1.jpg" https://bugs.launchpad.net/bugs/1763273/+attachment/5111739/+files/radeon_kernel_panic1.jpg ** Description changed: 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 16.04.3 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 16.04.3 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 started - using 16.04. + 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, or we get a kernel - panic text screen (see attached screen photo). + 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- + 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! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718885] Re: chromium doesn't start in guest session (xubuntu 16.04)
I'm not at the kiosks now and can't run apt-cache, but I did run ldd earlier, and can report that for the Chromium binary (/usr/lib/chromium- browser/chromium-browser) ldd reports libffmpeg.so as not found. That's why the shell script /usr/bin/chromium-browser sets LD_LIBRARY_PATH=/usr/lib/chromium-browser before executing the binary. That allows libffmpeg.so to be located for regular users, but not for guest users -- as I noted, I think that's because of the interaction of the AppArmor "Cx" setting for Chromium, which causes the environment variables to be scrubbed just before the binary is executed. That's my guess, anyway. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718885 Title: chromium doesn't start in guest session (xubuntu 16.04) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1718885/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718885] Re: chromium doesn't start in guest session (xubuntu 16.04)
All nine of our kiosks, running a mix of Ubuntu 14.04.5 LTS and 16.04.3 LTS, are now exhibiting this bug. So we can definitely reproduce it on a mix of hardware and software. Uninstalling and reinstalling Chromium did not help. Here's someone else's forum post on the same topic too: https://askubuntu.com/questions/958378/chromium-will-not-start-in-guest- session-on-ubuntu-16-04-3-lts As the original bug report notes, it only affects guest session users, not regular users. While logged in as a regular user, though, it can be demonstrated by trying to run Chromium via the lightdm-guest-session: $ /usr/lib/lightdm/lightdm-guest-session /usr/bin/chromium-browser /usr/lib/chromium-browser/chromium-browser: error while loading shared libraries: libffmpeg.so: cannot open shared object file: No such file or directory Now libffmpeg.so *is* provided as part of the Chromium install, under /usr/lib/chromium-browser/libffmpeg.so, and simply copying it to a standard directory allows Chromium to launch via the guest session: $ sudo cp /usr/lib/chromium-browser/libffmpeg.so /usr/lib/x86_64_linux_gnu $ /usr/lib/lightdm/lightdm-guest-session /usr/bin/chromium-browser [Chromium launches] Obviously, that's not an ideal solution. I also found that disabling AppArmor's profile for the LightDM guest session allowed the above test to succeed (i.e., to launch Chromium): $ sudo apparmor_parser -R /etc/apparmor.d/lightdm-guest-session $ /usr/lib/lightdm/lightdm-guest-session /usr/bin/chromium-browser [Chromium launches] Or, editing out the #include statement in /etc/apparmor.d/lightdm-guest- session which includes the sub-profile /etc/apparmor.d/abstractions /lightdm_chromium-browser and then reloading AppArmor also worked: [comment out #include of abstractions/lightdm_chromium-browser in lightdm-guest-session] $ sudo apparmor_parser -r /etc/apparmor.d/lightdm-guest-session $ /usr/lib/lightdm/lightdm-guest-session /usr/bin/chromium-browser [Chromium launches] Interestingly, nothing is captured in /var/log/kern.log; there's no obvious error message here. Digging into the /etc/apparmor.d/abstractions/lightdm_chromium-browser configuration, it looks like the Chromium binary is executed with the "Cx" settings, e.g.: /usr/lib/chromium-browser/chromium-browser Cx -> chromium According to the man page (http://manpages.ubuntu.com/manpages/xenial/en/man5/apparmor.d.5.html), the "Cx" setting means "transition to subprofile on execute -- scrub the environment". Now, the /usr/bin/chromium-browser shell script has some code which sets LD_LIBRARY_PATH to include /usr/lib/chromium-browser, precisely so that libffmpeg.so can be located by the runtime linker. My guess, therefore, is that the AppArmor sub-profile for Chromium is causing LD_LIBRARY_PATH to be scrubbed from the environment, so libffmpeg.so can not be located at runtime. One other oddity is why all our LTS machines (both 14.04 and 16.04) now have libffmpeg.so in /usr/lib/chromium-browser, not /usr/lib/chromium-browser/libs. But when I checked with dpkg-query, the former (/usr/lib/chromium-browser/libffmpeg.so) is definitely what was listed, and that's where the shared library was installed. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718885 Title: chromium doesn't start in guest session (xubuntu 16.04) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1718885/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
