[kde] [Bug 495611] New: Blank screen with cursor dash freeze after Neon Update. I have booted with Ctrl+Alt+F3 (probably graphics issue?) MAY NOT BE A BUG

[Peter]

https://bugs.kde.org/show_bug.cgi?id=495611

            Bug ID: 495611
           Summary: Blank screen with cursor dash freeze after Neon
                    Update.  I have booted with Ctrl+Alt+F3 (probably
                    graphics issue?)     MAY NOT BE A BUG
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Neon
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: kde.kindling016 at passmail.net
  Target Milestone: ---

SUMMARY

After KDE Neon / Plasma update where you changed the wallpaper from tree to the
bow / ribbon, and also after updating the Ubuntu LTS version as you advised, I
have had recurring intermittent trouble getting my OLD hardware to properly
boot.  I think (but am not fully confident at this point) that I can bypass the
problem / frozen screen by using control+alt (option on my Mac keyboard) + F3. 
I think this is a Ubuntu command to bypass a graphics driver.  Lots of people
have reported blank screen with dash related to update after KDE Neon.

I can keep doing this F3 boot process after updates if needed, but I'd prefer a
more permanent fix so the boot up process works properly.

STEPS TO REPRODUCE
1.  Accept updates and specify restart when such updates are offered in
Discover.
2. System reboots, shows KDE circle and counts percent complete on updates,
then restarts again.
3. On this second restart, I get a black screen -- sometimes with a small dash
in the left third of the screen slightly above half way up.  Other times, I get
a black screen with no visible cursor.  There is enough backlight available for
me to know the system is on but monitor not working properly...

OBSERVED RESULT

above

EXPECTED RESULT

Normal boot to login screen.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 6.2
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.8.0-48-generic (64-bit)
Graphics Platform: Wayland  [NOTE: Should I change this??  If yes, I need to
know how]
Processors: 8 × Intel® Core™ i7-2600 CPU @ 3.40GHz
Memory: 31.3 GiB of RAM
Graphics Processor: AMD BARTS [Additional info:  This is Mid2011 27" iMac. 
Graphics is GForce GTX6970M 1MB)
Manufacturer: Apple Inc.
Product Name: iMac12,2
System Version: 1.0

ADDITIONAL INFO:
I think graphics card may no longer be supported per some online research.  I
have had ZERO troubles prior to this recent KDE + Ubuntu update.  Problem may
be with Ubuntu LTS and not with KDE???

Would love to know if there is a way I can use Terminal to specify a boot
process to avoid this trouble.
I am not 100% sure that the CTRL+ALT+F3 boot keys always work but this seems to
get me out of blank screen jail...

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