[Bug 1580692] [NEW] Dell latitude e6520 display freezes must reboot

Olivier Caudron olivier at caudron.info
Wed May 11 16:42:57 UTC 2016

Public bug reported:

This is a fresh install of Ubuntu 16.04LTS 64 on a Dell Latitude E6520
laptop with an Intel core i7-2720QM (4 core) CPU, 8GB RAM and an NVIDIA
N12P-NS2 video controller. The display freezes at random (I had this 10
times today with completely different apps running). The mouse still
moves but the system does not react to clicks or keypresses (not even
Ctrl-Alt-Del etc. and I can't access terminals at Ctrl+Alt+F1 etc.) It
does not shut down gracefully when the power button is pressed. The
system is however still active and can be accessed externally through
SSH. The mouse and screen seems slightly less responsive than usual a
few seconds before the freeze so that I can "feel it coming". However,
it is hardly noticeable.

I noticed that the underside of the laptop is sometimes very hot when
the display freezes, but it is not systematic, sometimes the freeze
happens after the laptop had time to cool before booting and hasn't got
hot yet.

Until recently this laptop was running windows 7 64 pro without any
problem. I have performed a full hardware test of the laptop (via setup)
only a couple of days ago, there was no issue.

I attached the output of dmesg and the Xorg.0.log file.

This is not a critical system to me but I thought I'd report the bug for
all intents and purposes, and I'd rather not reinstall windows on it if
it can be helped ;-)

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

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  Dell latitude e6520 display freezes must reboot

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