Bug 430207

Summary: Plasma desktop & SDDM aren't working properly with NVIDIA 455
Product: [Plasma] plasmashell Reporter: techxgames
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED UPSTREAM    
Severity: normal CC: ekurzinger, nate, plasma-bugs, shagooserver
Priority: NOR    
Version: 5.20.4   
Target Milestone: 1.0   
Platform: Neon   
OS: Linux   
Latest Commit: Version Fixed In:
Attachments: NVIDIA bug report

Description techxgames 2020-12-10 06:11:41 UTC 
SUMMARY
On my KDE Neon 20.04 Testing Edition with 5.8.0-31 kernel & dual 1080p+2160p setup, the display scaled down to 1024x768 and only showed it on my 4K monitor (can't change the resolution from Plasma's display settings). I tried opening NVIDIA settings and nothing showed up, either. Reverting back to 450 fixed it.

STEPS TO REPRODUCE
1. Install NVIDIA 455
2. Reboot

OBSERVED RESULT
The output only shows up on the 4K monitor, but not on the 1080p monitor. Upon login, nothing shows up for NVIDIA settings. and output is 1024x768 on the 4K monitor.  Also unable to change the resolution.

EXPECTED RESULT
Should work normally, with 4K+1080p, and desktop layout not changing.

SOFTWARE/OS VERSIONS
Operating System: KDE neon Testing Edition
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.77.0
Qt Version: 5.15.2
Kernel Version: 5.8.0-31-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-6500 CPU @ 3.20GHz
Memory: 15.6 GiB of RAM
Graphics Processor: GeForce GTX 1060 6GB/PCIe/SSE2

ADDITIONAL INFORMATION
I'm on KDE Neon Testing Edition.
Comment 1 Nate Graham 2020-12-10 17:07:57 UTC 
If reverting the driver fixes it, this is most likely an issue in the NVIDIA driver itself. Please report it to the NVIDIA folks. Thank1
Comment 2 Erik Kurzinger 2020-12-10 22:11:58 UTC 
What Nate said. You can either send an email to linux-bugs@nvidia.com or make a post here https://forums.developer.nvidia.com/c/gpu-unix-graphics/linux/

It would be helpful if you could run nvidia-bug-report.sh and attach the resulting file in your report.
Comment 3 techxgames 2020-12-11 01:22:59 UTC 
Created attachment 133985 [details]
NVIDIA bug report

Here's the output from the NVIDIA.
Comment 4 Nate Graham 2020-12-16 22:04:26 UTC 
*** Bug 430379 has been marked as a duplicate of this bug. ***