On Sun, 23 Sep 2018 11:27:19 +0500 "Alexander V. Makartsev" <avbe...@gmail.com> wrote:
> On 23.09.2018 07:51, Celejar wrote: > > Hi, > > > > I've been experiencing a great deal of frustration recently with > > intermittent freezes / crashes on my Debian Sid system (a Lenovo > > W550s). The symptoms are that the screen totally freezes and the system > > becomes completely unresponsive (even ssh attempts from another machine > > fail), and the only thing that seems to have any effect is a hard > > reboot (holding down the power button until the system restarts). > > > > Upon reboot, I can't find anything at all interesting in 'journalctl -b > > -1', or /var/log/syslog - the former just shows everything looking > > normal until the moment of the crash, at which point the log just ends, > > and the latter also just shows everything seeming to be fine until the > > moment of the crash, and then shows the boot messages from the reboot. > > > > Any ideas of what could be causing this, or how I could go about > > debugging it? I've been using this machine for years without > > experiencing anything like this, and I'm not sure for how long this has > > been a problem. I did recently upgrade from stable to unstable, but I'm > > not sure whether or not the problem's initial occurences coincide with > > the upgrade. > > > > Celejar > > > With symptoms like this, I'd suspect hardware problems. If there is > something bad happened with some software the kernel would know and warn > about it. > > Best way to debug it, I think, is to test hardware under load with > another fresh OS. Debian stable or Windows trial version would do. > Severe over-heating can cause this. So monitor temperatures of CPU and > ICH. Dangerous levels like 80C-90C-100C should be dealt with. I suspected thermal issues, but the problem seems to occur when the fans aren't even running (of course, maybe there's some fan related malfunction ;)). I'll keep a closer eye on the sensors. > You have to check if battery is ok, PSU performs alright and can deliver > power under high-load. > During tests you can apply small amount of vibration to the laptop (with > constantly typing on the keyboard, or just tapping on the sides of the > laptop) to check if there are some solder joints become crackled and > could loose contact temporarily. > Do all tests sequentially, to be able to find root cause for the > freezes. If you got few lockups while tapping, you have faulty > motherboard that should be serviced or replaced. One of the reasons I buy Thinkpad T (or W) series machines is to not have to worry about such things, but I understand that there are no guarantees ;) I'll try some stress / system testing (memtest, sysbench), with tapping, and see what I find. Thanks much, Celejar