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 | slzoutendijk@gmail.com
Sent from my phone, please excuse my brevity.
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