Hi Henning, thanks for the tip. However, I've been experiencing this issue already before the spectre/meltdown bunch hit the fan. It does sound like it a bit, but likely is some different HW stuff. For now I'm experimenting with i915.enable_rc6=0. I hope it won't bog down the battery run-time too much.
Ondrej G. On Wed, Feb 21, 2018 at 3:55 PM, Henning Follmann <hfollm...@itcfollmann.com > wrote: > On Wed, Feb 21, 2018 at 09:51:58AM +0100, Ondřej Grover wrote: > > Hello, > > > > I need help debugging random total system lock-ups. > > This is a notebook Acer Aspire V3-572G-78A running Debian Stretch with > > the 4.9.0-5-amd64 kernel. > > > > When running on battery (does not happen on AC power), usually after > > resuming from RAM, after some rather random time (can be a few minutes to > > hours) the system suddenly locks up, the screen freezes, keyboard and the > > click-pad don't react, sound keeps playing a ~2 second loop. The computer > > does not react to magic SysRq combos (probably because the keyboard > doesn't > > react), or to pressing the power key. I cannot ping it nor ssh into it. > The > > notebook appears to stay in this state indefinitely (the screen does not > > blank). Only a ~10-sec power-key hold or removing the battery does a hard > > reset. > > > > I believe this is a kernel-level lock-up in some hardware driver. > > Unfortunately, I haven't been able to find out which one, because the log > > files (tried both syslog and journald) contain nothing out of the > ordinary > > just before the lock-up. Probably the IO locks-up as well. > > > > Netconsole isn't really an easy option, because I cannot reliably > reproduce > > this in a suitable controlled environment, which is further complicated > by > > the lack of polling support (required for netconsole) on the wireless > > interface. > > > > My suspects: > > - The integrated Intel graphics card with the i915 driver: always had > > issues with it (on linux-3.16 it used to crash/hang a lot), maybe the gpu > > hangs are not properly detected anymore. > > - The hard disk sometimes loses APM levels after suspend (have to use > > pm_async == 0 to prevent errors after each suspend). Maybe this points > to a > > larger suspend/power-mgmt issue. > > - My iwlwifi interface sometimes crashes and only removing it from the > PCI > > bus and rescanning for it helps. But this procedure does not hang the > whole > > system. > > > > Any help, suggestions, pointers will be appreciated. > > > > Hello, > I do have some power management issues with 4.9.0-5-amd64. My issues seem > different than yours ( I cannot boot up with power plugged in) but it is > also a hard stop, no logs available. I really haven't figured out the exact > cause however in my case they seem related to the spectre/meltdown fix in > the newest kernel. > You can switch that off by adding pti=off to > GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub and running update-grub. > > It is no ideal solution, but maybe it helps narrowing down the issue. > > > -H > > > -- > Henning Follmann | hfollm...@itcfollmann.com > >
