Bug 475238

Summary: can't boot with kernel 6.5, black screen (boot with 6.4 / 6.1LTS are ok)
Product: [Plasma] plasmashell Reporter: fluffy bunny <bayu_swandana>
Component: generalAssignee: Plasma Bugs List <plasma-bugs-null>
Status: RESOLVED UPSTREAM    
Severity: normal CC: kde, nate
Priority: NOR    
Version First Reported In: 5.27.8   
Target Milestone: 1.0   
Platform: Manjaro   
OS: Linux   
See Also: https://bugs.kde.org/show_bug.cgi?id=475904
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description fluffy bunny 2023-10-05 10:15:21 UTC 
hello
i have problem after updaed to kernel 6.5, the screen goes black (doesn't display anything), after entering password in login screen
but after i revert back to kernel 6.4 or 6.1LTS, booting is OK, no problem

here is my hardware specs : (output from inxi -Fazy)
https://0x0.st/HWrO.txt

here is output of journalctl at booting with 6.5
https://0x0.st/HOnf.txt

and here is output of journalctl at booting with 6.4 (for comparison)
https://0x0.st/HOnm.txt

i have reported this at manjaro forum :
https://forum.manjaro.org/t/kernel-6-5-doesnt-work-with-amd-a9-apu/148383/13

laptop works fine with kernel 6.4 / 6.1LTS, just i am curious why 6.5 doesn't work (& based on my personal interpretation from journalctl output, it may related with KDE...)

any help is deeply appreciated
Comment 1 fluffy bunny 2023-10-22 05:53:03 UTC 
the pattern of this case had been found : case occurs only when scale at display setting < 100% in kernel 6.5
scale < 100% & kernel 6.5 >> problem occurrs
scale < 100% & kernel 6.4 >> no problem
scale = 100% & kernel 6.5 >> no problem

i hace created separated bug : 475904
Comment 2 Nate Graham 2024-08-20 16:36:34 UTC 
If a kernel upgrade reproducibly breaks something, then it's a kernel regression. Per Bug 475904#c8, it looks like that's exactly what happened.