Waveshare 8.8inch DSI display does not work...

[dac2audio]

Revert the modifications to config.txt but make sure the bolded line below is still present. It should have already been there in the unmodified config.txt.

[all]
dtoverlay=vc4-kms-v3d
max_framebuffers=2
display_auto_detect=1
disable_fw_kms_setup=1
arm_64bit=1

Then in Peripheral Config under "DSI displays" try setting type to Pi Touch 2.

Hello Tim,
Thanks for your support.
I found an issue with the DSI cable which was not well inserted in the socket.
Also in parallel, re-flash a brand new moOde installation.
The fresh install contains exactly what you proposed above and unfortunately does not help whatever the Pi Touch used.
I re-inserted in config.txt the following lines:

dtoverlay=vc4-kms-v3d
#DSI1 Use
dtoverlay=vc4-kms-dsi-waveshare-panel,8_8_inch

Now the display is alive and I can see the starting sequence and the home moOde screen.
Unfortunately, the orientation is wrong, 90 deg. clockwise.

I tried to change the orientation in cmdline.txt adding different value for:

video=DSI-1:480x1920M@60,rotate=xxx.

This changes the orientation of the start-up sequence, sometimes even with some display "bugs" but the home screen is still at the same position...

For information purpose, I also checked a Raspberry Pi OS and the display works pretty good...

Thanks and regards,
Jacques.