so far the i915.enable_rc6=0 option seems to have worked. No system hangs
with it so far. Haven't got a feel if battery run-time is worse, but the
difference probably isn't that bad.
On Wed, Feb 21, 2018 at 8:09 PM, Ondřej Grover <ondrej.gro...@gmail.com>
> 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
>> > hours) the system suddenly locks up, the screen freezes, keyboard and
>> > click-pad don't react, sound keeps playing a ~2 second loop. The
>> > does not react to magic SysRq combos (probably because the keyboard
>> > react), or to pressing the power key. I cannot ping it nor ssh into it.
>> > 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
>> > 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
>> > files (tried both syslog and journald) contain nothing out of the
>> > just before the lock-up. Probably the IO locks-up as well.
>> > Netconsole isn't really an easy option, because I cannot reliably
>> > this in a suitable controlled environment, which is further complicated
>> > 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
>> > 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
>> > bus and rescanning for it helps. But this procedure does not hang the
>> > system.
>> > Any help, suggestions, pointers will be appreciated.
>> 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
>> 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.
>> Henning Follmann | hfollm...@itcfollmann.com