Created attachment 188182 [details]
Display Configuration locks-up at load time.

SUMMARY

This bug is a regression from Plasma 6.3 Kubuntu  the 25.04.  Since upgrading to Kubuntu 25.10 Plasma 6.4 the Dispaly configuration panel and especially the screen rotation and sceen orientation freatures continually lapse and get stuck in incorrect properties.  The Display Configuration widget itself fails on start-up (lomg delay) and appears to reset before showing.  

These features worked promptly and smoothly for the previous Kubuntu 25.04 on this, the  same laptop.

STEPS TO REPRODUCE

This is the most negative scenario.  

1.  Begin with a suspended laptop (Kubuntu)

2. Open laptop screen from Suspeend, with screen vertical and keyboard in your lap (normal)

3. One every previouos version of Kubuntu until 25.04 the KDE screen refreshed almost immediately on resume.  The 25.10 screen and keyboard seem to be locked for a good amount of time, more than a minute.
   * One strategy is to click the power button which is set to show the login/logout-menu and cancel the logout.
   * That sometimes bring-up the screen in a more timely manner.
   * It feels as if the display has got "stuck" and everything is locked until it comes up

3. The screen (can be/is) stuck in up-side-down orientation
    * That depends on the last orientation in use when suspend was used

4. The user must use  the upside down screen 

5. Open the launcher and select 'Display Configuration'

6. 'Display Configuration' shows as "Not Responding"
    * see screenshot: Display-Conmfiguration.01:Not-Responding
    * The PC is locked during this time.  Keys, mouse, touchpad and touchscreen do not respond.
    * Including that command line is not working either until the Display Configuration comes up.

7. When the Display Configuration finally comes-up you, the  "Automatic" screen orientation sub-section is not present.
    * see screenshot: Display-Conmfiguration.02:Automatic-Missing

8. I found that swapping away from 'Display Configuration' to another pane, e.g. 'Night Light', and then and re-select 'Display Configuration' should paint the complete Display Configuration panel with the 'Automatic' orientaiton section.

9. If you need to get to work quickly, you need to use the manual orientation to set things right.

10. To actually apply the desired automatic screen orientation (again) you need to change something and APPLY.   Then change the Display Configuration to all the desired settings and APPLY.  If you do not make a first change, the changes do not seem to "stick"

11. When you use APPLY the PC is locked-up and there is a very noticible delay

12. Once the orientation looks right can you can press KEEP.

13. Then test the orientaion settings by rotating the laptop.  If eveything works great!  It usually does not.  

14.   When the settings are as desired, put laptop to SUSPEND.  Close the screen/lid.

15.  Open the lid to resume the laptop.  

16. Test the orientation settings by rotating the laptop and folding back the screen.  

17.  By step 16 the laptop orientation seems to be stable for this session.

18.  After SUSPEND and restart it is more common for the screen to again be upside down.  
       * I do not think the settings have been lost, it is more as if there is a failure on start-up and the software tries to restore things as they were at the time of stopping, rather than honouring the lost configuration.
      * But I'm guessing; largely because that PC lock-up at these times.

OBSERVED RESULT

As described above

1. PC lock-ups
2. Display Configruation lost and fields missing
3. Lock-up or no response during APPLY actions.
4. Display Configuration settings fail to persist

EXPECTED RESULT

I would like everyting to work nice and smoothly as it did with Plasma 6.3 / Kubuntu 25.04

*  I've seen posts on stackoverflow and other places suggesting the drivers for screen rotation and stuff are not installed.  

* I have previously checked all these settings and options.  On this Kubuntu 25.10 installation all the necessary software to suppor the screen orientaion WAS and Remains installed and working as expected when the configuration is honoured.

* The screen roation and other fuctions Actually Work when the Dispklay Configuration has beeb"reassembled" following the steps above.  


SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Kubuntu 25.10 
KDE Plasma Version: Plasma 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2

ADDITIONAL INFORMATION

Kernel Version: 6.17.0-8-generic (64-bit)
Graphics Platform: Wayland
Processors: 8 × 11th Gen Intel® Core™ i7-1165G7 @ 2.80GHz
Memory: 16 GiB of RAM (15.4 GiB usable)
Graphics Processor: Intel® Iris® Xe Graphics

* I don't have any idea where to look for error messages on this.
* There's noting obvious in the syslog 
   * One interesting thing to note is a fail to find locale metadata for en_AU (Australian English)
   * I saw this and felt that is strange since the PC has always been en_AU and it seems to be working correctly for most things.

Thses issues could related to these symptoms -- This problem is very specific and very time consuming to work-around.  

 * 166792 -- Endless wait at "updating system configuration
     *  There is a significant lag measured in minutes sometimes on the display.
     * Some documenation where the log can be found or command line alternative would help to get a handle on this aspect of the situation.

 *  413799 -- Screen settings panel: Presence of available inactive screens is hard to determine
     * I've seen fields missing
     * I've seen dispaly of screens take a long time.  The "Not Responding" message is not always shown.
     * The evnets I've seen seem to be more like something went wrong initialising or displayin the panel and what I eventually see is a "best guess".  BUT ... When (or If)  that has happened there is no mechanism to Persist the settings on screen.  Plasma only lets you do that if you changed something, refere to step 10 abover, you seem to need that first change and APPLY to "save" something and wipe or recreate what ever has been lost (as my hypothieis would suggest).

Please let me know if there is a specific log I can look at.