On Sat, Sep 22, 2018 at 10:51:27PM -0400, Celejar wrote: > > 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.
How long have you waited before you reboot? I occasionally (pretty rarely, thankfully) get freezes on my Lenovo T400 running Debian 9 Stretch (stable) and I used to think I would have to hard reboot it like you do, but I noticed that they actually get fixed if I wait up to a few minutes. Never timed them but the longest probably lasted more than five minutes. Usually they're less than a minute. When these freezes happen, it seems it is relatively soon after starting to use the laptop after it's been suspended overnight or so. They're rare, though. I didn't try ssh'ing at the time but everything is completely frozen. And finally, these freezes didn't use to happen a year ago or earlier but it's been at least a few months that this has been going on. Your machine and Debian version seem much newer but I thought I'd share my experience.
