[Bug 1055493] New: kernel panic after wakeup from STR / on switching terminals / displays after upgrade linux-default-4.4.36-8.1 -> 4.4.49-16, and still happening on 4.4.79-18.26-default
http://bugzilla.suse.com/show_bug.cgi?id=1055493 Bug ID: 1055493 Summary: kernel panic after wakeup from STR / on switching terminals / displays after upgrade linux-default-4.4.36-8.1 -> 4.4.49-16, and still happening on 4.4.79-18.26-default Classification: openSUSE Product: openSUSE Distribution Version: Leap 42.2 Hardware: Other OS: Other Status: NEW Severity: Major Priority: P5 - None Component: Kernel Assignee: kernel-maintainers@forge.provo.novell.com Reporter: okurz@suse.com QA Contact: qa-bugs@suse.de CC: sebastian.chlad@suse.com, tiwai@suse.com Depends on: 1029634 Found By: --- Blocker: --- +++ This bug was initially created as a clone of Bug #1029634 +++ ## observation On DELL Latitude E7250 after waking up the system from STR in the docking station and calling `xrandr` to enabled the display connected over DP sometimes the system halts and has a kernel panic. Originally reported as bug #1029634 and thought to be fixed but it still happens sometimes although less than before. ## reproducible So far I do not know a non-statistical way to reproduce so the best way to reproduce it is so far -> Run the following procedure every day until the problem happens :-/ : * system in docking station with internal screen and external DP screen on docking station enabled in openSUSE Leap 42.2 in awesome window manager * work a day * put system to STR in docking station * wait for system to be in STR * close lid * undock * bring computer back home * sometimes switch computer on from home, sometimes not. Switch on, call xrandr and configure only single, internal screen, work, switch off * next day go to work * put computer in docking station * open lid, computer switches on * wait some seconds or not * unlock screen * call xrandr over keyboard shortcut bound to script to call xrandr to enable external screen * observe problem or if not, repeat whole procedure ## expected results last good should be linux 4.4.36, at least I do not recall observing this problem in before the last kernel update, at least not that often. Expected: Obviously the kernel should not crash here. -- You are receiving this mail because: You are on the CC list for the bug.
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--- Comment #1 from Oliver Kurz
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--- Comment #2 from Oliver Kurz
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--- Comment #3 from Takashi Iwai
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--- Comment #4 from Oliver Kurz
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--- Comment #5 from Takashi Iwai
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Takashi Iwai
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Oliver Kurz
No matter whether the test kernel works or not
I was still running the vanilla kernel 4.4.79-18.26.2 until now when I could just reproduce a very similar crash when trying to switch the displays although it seems far less likely to hit that problem then with kernel-default. Also the graphics behave different: After a suspend even when not changing the monitor layout the external screen is more prone to stay dark until I force switching the monitor off and on again, be it over xrandr or when using the physical power button on the screen. Right now I am running 4.4.85-2.gba575f2-default from your test repo. It could be some time until I hit this problem again as it is hard to reproduce and also it's my work environment where I have to do some other work to do than just kernel graphics stack testing so please be patient :-) please test the upstream
4.12.x and 4.13 kernels to see whether we're tracking the same problem.
If/when my system crashes again with above's 4.4 test kernel I will check with the latest current kernel kernel-default-4.13.0-2.1.g7e9e30a.x86_64 from Kernel:HEAD (I assume this is the one you mean with upstream. -- You are receiving this mail because: You are on the CC list for the bug.
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Oliver Kurz
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Jiri Slaby
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Oliver Kurz
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