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  • Issues
  • #1346

Closed
Open
Created Oct 23, 2020 by Michael Kuhn@michael.kuhn

Kernel lockup when turning on monitor after idle

Brief summary of the problem:

I am using GNOME Wayland. When my monitor turns off due to me locking my session and stays off for a while, I get a kernel lockup when trying to turn it on again by moving the mouse or typing something on the keyboard. The problem seems to be specific to DisplayPort, at least I could not reproduce it with HDMI.

The monitor will try to wake up but then go back to standby. The system is completely locked up then and Ctrl-Alt-Del does not work anymore. I have to reset it using the power button. If I keep the monitor from turning off, the system is completely stable.

The BIOS settings are pretty much standard. I have already tried the following kernel and BIOS settings without success:

  • Typical Current Idle in BIOS (deactivates package C6)
  • processor.max_cstate=5
  • amdgpu.dc=0 (does not boot)

Hardware description:

  • CPU: AMD Ryzen 5 PRO 4650G
  • GPU: AMD Ryzen 5 PRO 4650G
  • System Memory: 32GB HyperX Predator DDR4-3200
  • Display(s): Dell P2415Q A00
  • Type of Diplay Connection: DisplayPort
  • Mainboard: Gigabyte B550M AORUS PRO, BIOS F10 09/18/2020

System information:

  • Distro name and Version: Fedora 32
  • Kernel version: 5.8.15-201.fc32.x86_64
  • Custom kernel:
  • AMD package version: No package

How to reproduce the issue:

  • Lock screen in GNOME Wayland and wait for it to turn off
  • Leave computer alone for 30 minutes
  • Move mouse or hit a key to wake it up again

Attached files:

  • journal.log
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