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I am running the Ubuntu 14.10 with Gnome desktop. My machine is Lenovo t440s.

Specs: Processor: 4th Gen Intel® Core™ i7-4600U (4MB Cache, up to 3.30GHz) 12 GB RAM GPU: Intel® HD Graphics 4400

The issue is that my desktop will freeze. This happens randomly and will occur if I do something such as pressing a button or even pressing ctrl-shift-t for new tab once.

I am not sure if this is an issue with Gnome shell or the kernel.

This doesn't happen frequently, probably once every 4 hours. Its not really predictable.

Once it does freeze, I can move my mouse smoothly. The cursor will change into I shape if it hovers over text. However, I cannot click anywhere. I tried to ctrl-alt-f1 to switch to terminal, but that does not work. So I am forced to hold the power button to reboot.

I will provide more details if needed. Is there any way I can keep a resource log so that once it happens, I can see exactly which process is responsible?

Any suggestions on the source of the problem or a fix is welcome.

mrQWERTY
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  • Probably a duplicate of http://askubuntu.com/questions/4408/what-should-i-do-when-ubuntu-freezes. Wait a bit, do the magic-sysrq thing, and hope that something is saved in the logs (/var/log/messages). Seems a panic. Do you have a wireless wacom tablet connect, by chance? – Rmano Nov 07 '14 at 08:33
  • @Rmano Nope. However, I updated my kernel from 3.16.0 to 3.16.3 and so far it seems to be working fine right now. I'll give updates. – mrQWERTY Nov 07 '14 at 08:38

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DDR2 memory clock fixed at 200MHz in motherboard firmware BiOS CMOS setting solved my Random Screen Garble Freeze bug related to NViDiA graphics processor driver, without any graphics driver update :)

DDR2 memory clock = "Auto" = old default
DDR2 memory clock = "200MHz" = new fix

motherboard = ASUS = M2N MX SE PLUS;
BiOS = version 602 AMi BiOS from ASUS; NViDiA graphics chip = GeForce6150SE; DDR2 = 4GB( 2GB+2GB ) Transcend

"Auto" setting in BiOS CMOS was defaulting to 400MHz DDR2 memory clock which used to randomly freeze & garble my display screen;

i gave up NViDiA driver update as it had many other issues like missing 1366x768 pixel option;

i used Ubuntu built-in xrandr & cvt for 1366x768 pixel screen setup, instead of using NViDiA graphics driver update ( just added the below 2 lines at the beginning of /etc/gdm/Init/Default text file:; 

xrandr --newmode 1366 85.25 1368 1440 1576 1784 768 771 781 798

xrandr --addmode VGA-1 1366

i don't need NViDiA graphics driver update anymore

YVRao
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