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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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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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
** Attachment added: "Lsusb.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117654/+files/Lsusb.txt
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Title:
** Attachment added: "JournalErrors.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117651/+files/JournalErrors.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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** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117653/+files/Lspci.txt
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Title:
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117655/+files/ProcCpuinfo.txt
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** Attachment added: "UdevDb.txt"
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** Attachment added: "LightdmLog.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117670/+files/LightdmLog.txt
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** Attachment added: "xserver.outputs.txt"
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** Attachment added: "Xrandr.txt"
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** Attachment added: "xdpyinfo.txt"
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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
** Attachment added: "LightdmDisplayLog.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117652/+files/LightdmDisplayLog.txt
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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117629/+files/Dependencies.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: "XorgLog.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117662/+files/XorgLog.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"
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** Attachment added: "XorgLogOld.txt"
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** Attachment added: "ProcModules.txt"
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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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