https://bugzilla.kernel.org/show_bug.cgi?id=206791
Bug ID: 206791
Summary: Lenovo C940 - Freeze on reboot when
connecting/disconnecting USB-C charger
Product: ACPI
Version: 2.5
Kernel Version: 5.4, 5.5, 5.6-rc4
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Off
Assignee: acpi_power-...@kernel-bugs.osdl.org
Reporter: email-...@laposte.net
Regression: No
Created attachment 287833
--> https://bugzilla.kernel.org/attachment.cgi?id=287833&action=edit
Dmesg when disconnecting power, rebooting and freeze.
Hello,
I have a Lenovo C940 with Manjaro, tested with kernels 5.4, 5.5 and 5.6-rc4. If
I reboot/shutdown the laptop after connecting/disconnecting the usb-c charger
it "may" leads to system freeze during reboot after OS shutdown.
This is not a systematic bug, when it happens, the OS cleanly shutdown, the
screen becomes black but with backlight still on and freeze. Sysreq keys do not
work at this stage. Nothing else is connected to the laptop. I need to force
shutdown by keeping the power button pushed for a few seconds.
When powering on back the laptop, if I do not plug/unplug anything on the usb-c
power port, bug will most probably occur again at the next reboot. The only
systematic way to be able to keep the laptop rebooting correctly is to plug
back the power usb-c when the laptop is off.
I joined the dmesg/system journal logs after a first clean boot, with power
disconnection and then a reboot with freeze. Under Windows all seems to work
fine.
Also, this is not happening 100% of the time. I may have several successful
reboots while having connected/disconnected usb-c. Most of the time, only
repeating a connection/disconnection is enough to get the bug. I tried also
with a usb-c dock and same bug appeared.
Not sure how to get more logs from kernel after journal daemon is turned off by
the OS.
I welcome any suggestions to narrow down this bug. Thanks for the help.
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