Ubuntu: My Thinkpad X1 2015 freezes randomly. How do I diagnose the issue?



Question:

I have a Thinkpad X1 Carbon 2015 (20BSCTO1WW). Intel i5-5300U processor, 14" FHD Screen, 8GB RAM, 128GB SSD.

I'm running Wily (15.10.) I installed Wily on this machine while it was still in beta. Been keeping it updated.

The system locks up hard, seemingly at random. I've configured/tested Magic SysRq combinations, but they don't work when the system locks, and I can't switch to a terminal.

I'm not eager to do a fresh install, but can't seem to diagnose the issue.

I'm mostly looking for other diagnostic methods: the kernel goes unresponsive (doesn't panic, just freezes,) and none of the logs are showing any common thread. It happens 1-4 times per day in normal use. Seems to be related to input (ie- I've never had it happen while I wasn't directly using the machine.)

Any idea what I can try?

EDIT 2015-11-21 @ 1:00pm EST: The machine does not recover from the freeze.

EDIT 2016-02-12 @ 1:30pm EST: The issue was kernel-related. I upgraded from the 15.10 stock 4.2 kernel to one of the mainline kernels (in my case, I'm using http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/) and it has been running flawlessly since.


Solution:1

The issue was kernel-related. I upgraded from the 15.10 stock 4.2 kernel to one of the mainline kernels (in my case, I'm using http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/) and it has been running flawlessly since.

I didn't find the root of the problem, but the kernel upgrade allowed me to get on with my life error-free.


Solution:2

Are you using a swap partition?

Collect more data. Here are some ways:

If the system recovers from the freeze (not clear from above), immediately do ls -lrt /var/log, and inspect the most recently modified logfiles.

Write a Bash script to collect data (date, uptime, ps -efwwwl,free, ...), append it to a file, sync, sleep for N seconds and loop. Then run it backgrounded, at a high priority (man nice).

Consider running gkrellm, to display system performance.


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