[k3b] [Bug 467201] New: K3b doesn't properly apply the write speed for a 50GB DL BD-R

[Valso]

https://bugs.kde.org/show_bug.cgi?id=467201

            Bug ID: 467201
           Summary: K3b doesn't properly apply the write speed for a 50GB
                    DL BD-R
    Classification: Applications
           Product: k3b
           Version: 22.12.3
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Burning/Hardware
          Assignee: k3b at kde.org
          Reporter: stalliondrift at gmail.com
                CC: michalm at jabster.pl, trueg at kde.org
  Target Milestone: ---

The BD-R disc has stuff written on it, such as write speed, brand (Media
Range), etc. K3b detected the disc but the write speed was shown as "Auto", so
I assumed it would automatically apply write speed 6x but it didn't. Instead,
it was burning at 9-12x. At first it looked OK but at 42% written data, the
process got stuck and the writer began making weird sounds. The closest thing
to which these sounds were: like a farmer's tractor stuck in the mud and unable
to get out, spinning wheels in place.
So I had to put in another BD-R disc and manually select writing speed 6x. It
surely is slower that way but at least right now it's at 83% data burned and no
signs of getting stuck.


STEPS TO REPRODUCE
1. Run K3B and insert any 50GB BD-R DL disc in the optical device.
2. Select stuff to burn and leave the speed at "Auto".
3. Start the burning process.

OBSERVED RESULT
During the burning process observe the writing speed which could vary but will
always be higher than 6x.

EXPECTED RESULT
Inserting a 50GB BD-R disc should automatically select write speed 6x. (see
"additional information")

SOFTWARE/OS VERSIONS
Linux/Desktop: Arch Linux 6.2.2-arch1-1/Cinnamon 5.6.7
Qt Version: qt5-base 5.15.8+kde+r182-1 & qt6-base 6.4.2-1

ADDITIONAL INFORMATION
I've bought many dual layer BD-R discs over the last few years and on ALL of
them it always reads "write speed 6x" which makes me think this is some kind of
a standard, which is why I think the burning software should always select
write speed 6x, whenever it detects the BD-R disc is 50GB DL.

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