External screen not waking up after S3 (USB-C / DP-alt-mode / 144hz)
Brief summary of the problem:
I have an issue when putting my Slim 7 Pro (14ARE05) to sleep and waking up again, my external monitor (connected via USB-C Dock / DP-alt-mode) will remain dark. This only happens when the refresh rate is set to 144hz. When setting it to 60hz, the issue does not occur. When plugging out the dock and reconnecting it, the monitor gets a signal again.
I suspect some issue with the USB-C bandwidth / lane negotiation with the dock when resuming from sleep.
This makes it quite cumbersome to use the notebook with a closed lid.
Hardware description:
- CPU: 5600H
- GPU: 5600H
- System Memory:16GB
- Display(s): 2; internal and AOC CU34G2X/BK
- Type of Display Connection: Internal (eDP) and DP over USB-C (HP Dock G5)
System information:
- Distro name and Version: Fedora 34
- Kernel version: 5.15.0-0.rc5.20211015gitec681c53f8d2.44.vanilla.1.fc34.x86_64 (I tried 5.14.11, 5.14.13 as well - no difference)
- AMD official driver version: from official Fedora 34 repositories
Please let me know if I can send you any logfiles. I did not find anything useful in dmesg yet.
Any help is highly appreciated.