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[Bug 1516108] [NEW] system freezes requiring hard reset at unpredictable times under different activities Kubuntu 15.10


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Kubuntu 15.10, about 3 day old installation on a new HP 15-f272wm laptop
(4096mb sdram, Intel Pentium N3540) keeps freezing, relatively
unpredictably. the mouse doesn't work, nor do any key combinations
(alt+f1, ctrl-alt-esc, ctrl-esc, ctrl-alt-[fkey], ctrl-alt-del-[shift],
etc., even power button unless held for powercycle hard reset)

I saved the kernel & system logs covering a couple times it happened,
available here
It happens most often when using chromium - i tried switching to
firefox, but it still has happened 1 or 2 more times, though chrome
seemed to trigger it more often, making me think maybe it's something
about memory &/or GPU allocation under moderate-to-heavy system load.  I
also saw something in the logs that looked like temp sensor errors or
recalibration, I think right before 1 of the crashes, but i didn't have
the time or expertise to be sure.

I tend to have 4-16 browser tabs open, often in 2-3 windows on 4 virtual
desktops, along w/ Pycharm community edition & i make heavy use of
yakuake dropdown terminal & custom keyboard shortcuts. The machine seems
to have free memory & spare cpu cycles when the problem occurs though,
so I think there's a legitimate malfunction.

Reproducible: Yes (inconsistently) 
Steps to Reproduce: 
1. Use computer for web browsing, python development, etc. 
2. some point, between 8min & 8hours, the mouse will freeze 
3. it's completely frozen at this point 

Expected Results: 
system would let me run my applications; if application crashes, it should still be possible to change windows, enter virtual terminal, kill offending process, etc i'm probably going to try installing kubuntu 15.04, because this problem almost makes my current setup worse than going back to windows

Actual Results: 
despite furious motions on the trackpad, alt+tab, & every other key combo i can think, no response at all. caps lock wont light up, etc. kernel seems totally unresponsible, though I haven't gotten sysreq magic key working to confirm extent of kernel lockup.

PS I hope this is the right place to submit this bug, b/c I mistakenly
submitted it at kde.org & they told me no, i should go to the
distribution bug tracker - I'm tentatively guessing that's here, but let
me know if I'm in the wrong place again

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: bot-comment
system freezes requiring hard reset at unpredictable times under different activities Kubuntu 15.10
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