[PROBLEM] Xbian update package breaks HDMI-output

[jakenl]

I had problems with the distribution upgrade to Buster, so I tried several things from the CLI. One of them was to disable the HDMI settings in config.txt. Where Buster didn't want to start Kodi, it at least booted and had everything very visual. When I removed those lines from the config.txt:

Code:

hdmi_edid_file=1
hdmi_group=2
hdmi_mode=68

I had no output on HDMI at all.
Removing the just put '#' from the mentioned lines, gave me my HDMI output back

At the end I didn't get Buster to work period, so I loaded my previous good image back: this was an image with all updates except the firmware package. I tried it there as well:
- remove the three lines from config.txt
- reboot
- no problem, Kodi comes up as expected
- update through the GUI the firmware package
- reboot
- no output at all from HDMI
- access through SSH
- make the 3 mentioned lines in the config.txt applicable again
- reboot
- no problem, Kodi comes up as expected, with the firmware package installed

Summary, after the firmware package, I need the prepared edid.dat file and use it in my config.txt to be able to use HDMI output. (this was both the case for a good running Stretch version of the OS as well as for the cripple running Buster upgrade version)