Bug 509148

Summary:	4th Monitor keeps disabling itself using "Baseus Portal Joy Series 13-Port Type C Hub"
Product:	[Applications] systemsettings	Reporter:	Shaun Roselt <shaunroselt>
Component:	kcm_kscreen	Assignee:	kscreen-bugs-null <kscreen-bugs-null>
Status:	NEEDSINFO WAITINGFORINFO
Severity:	major	CC:	nate, plasma-bugs-null
Priority:	NOR
Version First Reported In:	6.4.3
Target Milestone:	---
Platform:	SteamOS
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Shaun Roselt 2025-09-05 12:30:38 UTC

### Your system information

#### `fastfetch`:
Screenshot here: https://github.com/user-attachments/assets/7f0bc40c-83f0-4402-bbfb-1a38876d2102

### `kinfo`:
```
nouveau: driver missing
glx: failed to create dri3 screen
failed to load driver: nouveau
Operating System: SteamOS 3.8 Build: 20250904.1000
KDE Plasma Version: 6.4.3
KDE Frameworks Version: 6.16.0
Qt Version: 6.9.1
Kernel Version: 6.15.11-valve1-1-neptune-615-gf96afaca3ab2 (64-bit)
Graphics Platform: X11
Partition: B
Processors: 16 × AMD Ryzen 7 8845HS w/ Radeon 780M Graphics
Memory: 64 GiB of RAM (62.1 GiB usable)
Graphics Processor 1: AMD Radeon Graphics
Graphics Processor 2: llvmpipe
```

### Please describe your issue in as much detail as possible:

I have a "Baseus Portal Joy Series 13-Port Type C Hub" with 4 screens plugged into it. This is the exact one I have: https://www.amazon.co.za/Baseus-Portal-13-Port-Type-Grey/dp/B0D45S6BLJ/

All 4 of the screens are shown in the System Settings: https://github.com/user-attachments/assets/d560b365-d59a-4894-8515-6aae317aba63

From the above screenshot, the 4 screens are:
* Dell Inc. DELL SE2419H
* Invalid Vendor Codename - RTK
* Dell Inc. SE2717H/HX K9V8V77201AB
* Dell Inc. SE2717H/HX K9V8V7C40LRS

It's the "Dell Inc. DELL SE2419H" one that is currently selected that keeps disabling itself. I would enable it like so: https://github.com/user-attachments/assets/09a92c5f-7889-4792-81dd-25775b2791f2

I press Apply, but then nothing happens. It shows it's enabled though, and when I close System Settings and open it again, then the screen is disabled again.

So it seems like either it's not enabling it even though it shows it's enabled, or it disables itself immediately after enabling it.

I don't know. Either way, I can't get the screen to be enabled and working.

Comment 1 Nate Graham 2025-09-25 17:16:16 UTC

Hmm, you say there are 4 external screens but the screenshot shows 6. Can you clarify how many physical screens are plugged in?

Comment 2 Bug Janitor Service 2025-10-10 03:47:08 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 3 Shaun Roselt 2025-10-10 05:21:46 UTC

(In reply to Nate Graham from comment #1)
> Hmm, you say there are 4 external screens but the screenshot shows 6. Can
> you clarify how many physical screens are plugged in?

Like I said. The 4 screens that are plugged into the Type C HUB are the following:
* Dell Inc. DELL SE2419H
* Invalid Vendor Codename - RTK
* Dell Inc. SE2717H/HX K9V8V77201AB
* Dell Inc. SE2717H/HX K9V8V7C40LRS

Only 3 of them are working at a time.

Comment 4 Nate Graham 2025-10-10 14:55:55 UTC

So there are:
- 4 physical screens
- Only 3 are recognized by the system
- The System Settings page shows 6 screens

Are any of these screens the kind that are internally represented as two screens?

Comment 5 Shaun Roselt 2025-10-10 16:28:17 UTC

(In reply to Nate Graham from comment #4)
> So there are:
> - 4 physical screens
> - Only 3 are recognized by the system
> - The System Settings page shows 6 screens
> 
> Are any of these screens the kind that are internally represented as two
> screens?


There are 4 screens that are plugged into the Type C HUB. The other screens are from other places such as HDMI, DP, etc.

I'm specifically speaking about the ones that are plugged via my Type C HUB

Comment 6 Nate Graham 2025-10-20 18:42:25 UTC

Does it work in a Wayland session? You can switch by running `steamos-session-select plasma-wayland-persistent` in a terminal window. To make it return to the normal Steam-based UI by default, run `steamos-session-select gamescope` afterwards

Comment 7 Bug Janitor Service 2025-11-04 03:47:45 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!