Bug 2227427

Summary: External monitor don't work since kernel 6.4.4
Product: [Fedora] Fedora Reporter: bc5548e7-9fdd-4463-9964-4bd4809fe0dd
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: unspecified    
Version: 38CC: acaringi, adscvr, airlied, alciregi, bhoefer, bskeggs, garrett.mitchener, hdegoede, hpa, jarodwilson, josef, kernel-maint, lgoncalv, linville, masami256, mchehab, ptalbert, stephan.kusch, steved
Target Milestone: ---Keywords: Desktop
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
Output of `journalctl -b --no-hostname -k > dmesg.txt` command
none
Output of `journalctl -b --no-hostname -k > dmesg.txt` command after plugging screen in and out none

Description bc5548e7-9fdd-4463-9964-4bd4809fe0dd 2023-07-29 15:45:52 UTC 
I have external monitor connected via display port to dell WD19TB dock station. After upgrading kernel to 6.4.4 it stays blank after boot. Everything works fine if I select kernel 6.3.12 during boot.

Reproducible: Always

Steps to Reproduce:
1. boot kernel 6.4.4
2. there is no step 2

Actual Results:  
external monitor stays blank

Expected Results:  
external monitor should work
Comment 1 bc5548e7-9fdd-4463-9964-4bd4809fe0dd 2023-07-29 15:47:03 UTC 
Created attachment 1980607 [details]
Output of `journalctl -b --no-hostname -k > dmesg.txt` command
Comment 2 Stephan Kusch 2023-08-12 13:22:29 UTC 
I see a similar or the same issue. Laptop sits on a Lenovo ThinkPad Pro Dock 135W, external monitor is connected with DP. Since kernel 6.4 the external monitor instantly goes to sleep after GRUB, but is still available from terminal or Gnome settings (but still sleeping). Unluckily when trying to change the primary monitor in Gnome settings the internal screen goes blank while the external monitor stays blank either.
Comment 3 Stephan Kusch 2023-08-12 13:25:04 UTC 
Created attachment 1983142 [details]
Output of `journalctl -b --no-hostname -k > dmesg.txt` command after plugging screen in and out
Comment 4 bc5548e7-9fdd-4463-9964-4bd4809fe0dd 2023-08-12 17:23:42 UTC 
Yes, sounds like exact same issue. Looks like we are both running amd vega gpu.