Yes, the bugs are reproducable

1. Start and stop.

I have installed  Kubuntu 24.02 as an update for 18.04 (which works fine 
on my hardware).

For 'OS updating' I always buy a new Harddisk; the old one is my 'safety 
backup'.

Since the same brand and type HD is used, I dont expect any hardware 
problems.

After installation OS, the Login and Logout screen flashes when building 
up, and no texts appear.

After entering the password (no gliefs appears) the Login screen flashes 
and after some time the Desktop Window manager starts. Same thing with 
Logout screen ; flashes and no text.

Downloaded Kubuntu 24 again (on old drive), and made a new installation
DVD.

Re-installed Kubuntu; whole drive used new install, data cleared.  Login 
Logout still flashes, no text appears.


2. Installing software applications

--- While installing the software I use LibreOffice to 'update' my 
personal 'Installation Guide'---

Several times when using Discover for installing software the desktop 
'hangs'.  Mouse pointer is extreeeeemly slow, and nothing seems to 
happen at all.

After two hours a Power Off Reset.

Only when Discover is the only running application on the desktop, the 
sofware can be installed.

The screen does not hang whenever the Konsole is used for installation.


3. In 18.04 I have no mouse problems at all.  In 24 mouse responds are 
often slow and bad.  Mouse(pointer) seems to miss the selected icons or 
menu-items, and often a seconds mous-klick-attempt is necessary.


4. System Monitor used for trying to locate the problems. However, 
System Monitor responds are slow, bad and intermitterend.  Graphs are 
not displayed at all.

Attached is a Spectacle screenshot I just made of System Monitor while 
writing the email.  Notice the Monitors menu-text are written into one 
another.  Notice the Spectacle window that should not be visible at 
all.  Notice the compleet missing background screen of Thunderbird of 
this mail.  While making this screenshot my system hangs again.  Only a 
Power Off Reboot is a fix.

However, behind the screen Kunbuntu was still running, since this email 
was saved.

In Syslog I can find an awfull lot (pages!) of "QOpenGLShaderProgram:: 
..... : shader program is not linked" Error messages.



On 01-08-2025 00:43, Simon Poirier wrote:
> Thank you for taking the time to report this bug and helping to make Ubuntu 
> better. Please answer these questions:
> * Is this reproducible?
> * If so, what specific steps should we take to recreate this bug?
>
> This will help us to find and resolve the problem.
>
> One thing which strikes me is that the hardware specs appears on the lower 
> end, which might be affected by the load from a single application.
> Have you looked at the system monitor to see if one application is using all 
> the CPU, RAM or DISK IO?
>
> ** Changed in: xorg (Ubuntu)
>         Status: New => Incomplete
>

** Attachment added: "Screenshot_20250801_090948.png"
   
https://bugs.launchpad.net/bugs/2119215/+attachment/5895740/+files/Screenshot_20250801_090948.png

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https://bugs.launchpad.net/bugs/2119215

Title:
  Battle within screen manager?

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