I am fairly new to Linux and I am inexperienced in trouble shooting problems behind the scenes.
I have a HP nc6320. And I have recently upgraded from Ubuntu 13.04 to 13.10. I have been having issues with my computer freezing.
I have changed the memory sticks to a pair of matching 2GB sticks. From the info I have found my computer can handle this much and the freezing problems persisted. So I don't think that the memory could be the problem.
One interesting occurrence is that it only happens when my laptop is on battery power it will freeze any time with in 10 minutes to an hour with out fail.
I have tried to switch to a terminal ctrl+alt+(F1-F6) and that won't work either. The caps lock and numlock do toggle the led's. So I think that means no "kernel panic"?
Also something that concerns me is that on boot up and in the kern.log I see this line:
Nov 5 20:05:30 nc6320 kernel: [ 80.792073] [drm:intel_pipe_config_compare] *ERROR* mismatch in adjusted_mode.flags (expected 2, found 0)
From what I found is this an issue with my GPU?
I have greped through lspci for VGA and I believe this is my GPU:
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
I don't think this has any berring on freezing but it froze under Unity and GNOME 3.10. I always have firefox open and an email client (switched between thunderbird, geary, and evolution). I have looked on other forum posts and I understand that every freezing issue is unique. I would like if I could get help trouble shooting this issue but I would also like to know where I can find more information on how to trouble shoot these low level, behind the scenes issues.
Thank you for any help
EDIT: I ran MEMTEST for 11 hours. It went through 7 passes and there were 0 errors, so that's good I suppose. Is that long enough?