Dear all, I am wondering if someone can help me with a major problem that i have been having in Ubuntu, pertaining to a notoriously hard to diagnose issue of random freezing.
The problem started in 13.04, which would freeze randomly, from the day i installed it. I persisted with the issue for a while, hoping that it would work itself out with subsequent kernel updates and as 13.04 was patched. Unfortunately 2 months in i was still losing work to random freezes. I thus found myself with a free weekend and so decided to downgrade to 12.04 which had worked for me previously. Frustratingly however, i found that the problem now manifest there as well (there had been no problem in 12.10 previously). A system freeze appears to happen at random, although it is possibly related to having the machine on battery power. When it happens I can't input anything, and if there is a song playing it skips. Only way out is a hard reboot. I remain on 12.04, 64 bit. I have updated my bios, and run memtest86. The latter found no errors and the former has not improved things. The machine is a Lenovo x131e, Intel, with integrated graphics and broadcom wireless. I have tried filling a bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1174275, but got stuck as i could not properly test the upstream kernel as wireless would not work. The fact that there was a wireless problem on Broadcom BCM43228 and that the freeze appears to correlate with having the machine on battery power (i am still testing this) means that i thought it might be a problem with powersave on the wireless card. There were a number of posts about this but the general solution seemed to be to turn off the powersave option on the card (http://robertbeal.com/1248/ubuntu-10101104-freezing-battery-power). I did this to no avail as i still got a freeze when the machine was on battery power. I have also tried posting this problem on the forums ( http://ubuntuforums.org/showthread.php?t=2166195), providing a list or kernel errors that i get after a freeze. Understanding this list is beyond my ability, so i don't know where to start. I haven't had much luck with anyone there. At this point i am not sure what else to do. I don't know how to diagnose the problem any further as many forums simply say that analysing a system freeze is difficult. This is a bit of a massive bug for me as random system freezes really interrupt with my daily work. I'd love to get this resolved, or at least work out what the problem is so that i can get it reported. Ideally i'd have 13.04 working, but will settle for 12.04. If anyone can give me any advice on what steps to take to work out what the problem is, i would really appreciate it. Thanks, James.
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