Hi Paul, 
may I ask you a question?

I totally understood the policy here, but could you tell me where to
find for example the description of these parameters (especially the
bold ones):

====
display_rotate=2
max_usb_current=1
HDMI_FORCE_HOTPLUG=1
CONFIG_HDMI_BOOST=7
HDMI_GROUP=2
HDMI_MODE=1
HDMI_MODE=88
hdmi_drive=1
HDMI_CVT 1024 600 60 6 0 0 0
====
hdmi_group=2
hdmi_mode=87
HDMI_TIMINGS=1080 1 26 4 50 1920 1 8 2 6 0 0 0 60 0 135580000 3
=====
DTOVERLAY=PISCREEN,SPEED=24000000,ROTATE=90
=====

Why do they sometimes apply, sometimes not (for example
dtoverlay=[...]rotate=180 did not work as far as my experiences). What
is the related driver and what its API? Which busses are involved and
how to find out which one is served by the disply actually? BTW are
there any schematics on the pi?

And if you see the hdmi timings, how would you achieve to derive them
from what? Guessing??

Happy to look forward your answer!

BR Peter

paul- wrote: 
> Default calibrations are set for the 800x480 raspberry pi display.   And
> that is the resolution required for the Grid and joggler skins
> 
> Everything else requires a lot of manual setup.  Screen makers are
> notorious for poor documentation, so there are guides similar to what
> you have posted, but every screen is different.


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