Hi, i am the developer of libburn, which serves underneath xfburn and xorriso. (No need to Cc: me, as i have now subscribed to this bug.)
---------------------------------------------------------------------- Quite obviously this report is attributed to the wrong package. But it is not obvious which one would actually be the right one. The overall Debian system and the Linux kernel have not much stake in speed setting of DVD burners or burn success. To blame would rather be the backends, growisofs under K3B and libburn under the others. growisofs did not change in a decade. The jump from libburn-1.5.0 in Debian 10 to libburn-1.5.2 in Debian 11 isn't much suspicious either. Other distros use it since more than a year earlier. Please show your xorriso command line and the messages which you get at the end of the run. (No need to show the many progress messages prefixed by UPDATE. Everything else might be of interest. Most the very start and the very end of the run.) If you can afford experiments with rebooting, then it would be interesting to see whether you get better results from a Debian 10 Live ISO. E.g. pick your favorite desktop version from: https://cdimage.debian.org/mirror/cdimage/archive/10.11.0-live/amd64/iso-hybrid/ put it onto a USB stick: https://www.debian.org/CD/faq/#write-usb and after booting install xorriso like sudo apt-get update sudo apt-get install xorriso (Disclaimer: I did not test whether the 10.11.0 ISOs have apt-get.) Have a nice day :) Thomas
