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
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!
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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
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
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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
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
** Attachment added: "Xrandr.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117664/+files/Xrandr.txt
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Title:
** Attachment added: "xdpyinfo.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117665/+files/xdpyinfo.txt
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** Attachment added: "XorgLog.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117662/+files/XorgLog.txt
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Title:
** Attachment added: "LightdmLog.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117670/+files/LightdmLog.txt
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** Attachment added: "XorgLogOld.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117663/+files/XorgLogOld.txt
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** Attachment added: "xserver.outputs.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117666/+files/xserver.outputs.txt
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** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117656/+files/ProcCpuinfoMinimal.txt
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** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117657/+files/ProcInterrupts.txt
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** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117660/+files/UdevDb.txt
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** Attachment added: "UnitySupportTest.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117661/+files/UnitySupportTest.txt
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** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117658/+files/ProcModules.txt
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** Attachment added: "JournalErrors.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117651/+files/JournalErrors.txt
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** Attachment added: "Dependencies.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117629/+files/Dependencies.txt
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** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117655/+files/ProcCpuinfo.txt
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** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117628/+files/CurrentDmesg.txt
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** Attachment added: "Lsusb.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117654/+files/Lsusb.txt
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** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117653/+files/Lspci.txt
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** Attachment added: "LightdmDisplayLog.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117652/+files/LightdmDisplayLog.txt
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** Attachment added: "DpkgLog.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117630/+files/DpkgLog.txt
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Title:
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
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.
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** 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
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
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
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:
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