Re: Random hanging with stretch when laptop is connected to AC
Dear Debian Users, On Thu 20 Jul 2017 at 10:43:15 +0200, Sebastiaan L. Zoutendijk wrote: > Since I upgraded from jessie to stretch at the start of this month, I am > experiencing random hangs when my laptop (Clevo W950JU barebone) is connected > to AC. The screen freezes and if sound was playing it is repeated in a > 2-second loop. The system does not recover from this and does not respond to > any key, a short press of the power button, or SysRq commands. I have to shut > it down with a long press of the power button, which has caused considerable > filesystem damage over the past weeks. Nothing is written to the systemd > journal at the time of the hang, not even at log level 7. Since the last message I have consulted a friend and we came up with a few more options. Booting the still-installed jessie-backports kernel did not solve the issue, neither did downgrading systemd to the version in jessie. When I booted with systemd.unit=multi-user.target I noticed that this issue does not happen in a non-graphical environment. With the idea that the issue might be X- or graphics-related, I first downgraded xorg and its input and video drivers to the jessie versions, but that did not solve it, neither did additionally downgrading libdrm and mesa. Instead of continuing to downgrade random packages, I tried to restore a back-up of my / filesystem from before the upgrade to stretch. Unfortunately my back-up program seems to have forgotten a few files, which turned out to include some very essential system files. I managed to restore part of the damage from a chroot on a live system, but it turned out to be beyond my capabilities to fix. I have since returned to my jessie installation and managed to recover /home by restoring from the back-up and rescuing missing files from the damaged filesystem. I will undo the downgrades in a moment as they were ineffective. So I am back to square one. For the time being I will keep running this system with acpi=off. I might try a fresh install later. Yours faithfully, Bas Zoutendijk -- Sebastiaan L. Zoutendijk | slzoutend...@gmail.com
Random hanging with stretch when laptop is connected to AC
Dear Debian Users, Since I upgraded from jessie to stretch at the start of this month, I am experiencing random hangs when my laptop (Clevo W950JU barebone) is connected to AC. The screen freezes and if sound was playing it is repeated in a 2-second loop. The system does not recover from this and does not respond to any key, a short press of the power button, or SysRq commands. I have to shut it down with a long press of the power button, which has caused considerable filesystem damage over the past weeks. Nothing is written to the systemd journal at the time of the hang, not even at log level 7. I have tried a number of kernel parameters to see if I could locate the problem. The following parameters had no effect: nolapic noapic pci=routeirq pci=noirq This parameter caused frequent GPU hangs: idle=poll This parameter stops the hanging, but is disables too much functionality to be a viable option: acpi=off So it seems to be an ACPI issue, but I have no idea what exactly. Since it only started after upgrading to jessie, it is likely a software bug, not a hardware bug. I have also tried to make a kernel crash dump with kdump-tools, but nothing is dumped. I guess this means the kernel does not panic, but just hangs. When the hanging happens, some component of my laptop starts to become hot. This was not hot before the hanging. It seems to be a little chip below the heat pipe that runs between the CPU heat sink and the system fan. I do not know what this chip is; it is not labeled in the service manual and the picture is too low-resolution to read the model number. If anyone can recommend further steps to diagnose this issue, or other kernel parameters that might work around the issue, I would be very grateful. I am now out of ideas. Yours faithfully, Bas Zoutendijk PS My apologies for the lack of formatting, I have to use my phone because mutt does not like my damaged-beyond-repair forced-read-only btrfs /home. -- Sebastiaan L. Zoutendijk | slzoutend...@gmail.com Sent from my phone, please excuse my brevity.
