Waldy have you ever tried switching sd cards between your rev a devices? did it result in fading?
Hmm after more testing, I put a rev a waveform onto rev c with matching display, no fading, changed vcom so its no longer matching still no fading
Put matching display waveform from rev c onto rev a board, fading exists, change vcom using the 4.41 method, fading still exists.
I then try putting rev another rev c waveform onto the rev c board from someone elses image, right after testing the a board. surprise there was fading! but only temporarily... after a few reboots it was gone. i seem to be missing crucial information, cant tell if its my rev a board problem or not. maybe rev a and rev have different waveforms to match the display and i need a rev a with matching display and can only use that waveform to get it, but then why is rev c fine even iwith wrong waveform and vcom??
I verified vcom was changing by checking before and after sd card images, 2 bytes of data changed at offset 80030 column 07 and 08. so now knowing this, seems like all you need is 2 images of the firmware to find where the vcom is located opening a new avenue to change vcom possibly, if u can figure out what the number is supposed to be. i feel its odd surely someone has thought of this before... the same change was identified in same images with diff vcom
sudo dd if=/home/NiaC257waveform.img of=/dev/sdX skip=14335 count=34816 seek=14335 status=progress
command to copy waveform only, the vcom is located at offset 80030. thanks to postmarketos wiki for telling its located at sector 14336
FF04 252 FEFF 257 FF04 252 FEFF 257 FEEC 276 FEE9 279 FEEF 273 FEE7 281
i verified the vcom values by changing 252 to 257 and 257 to 252, giving the same hex values
GEE AFTER putting teh values into a converter, seems it is represtned by something called two's complement
https://www.rapidtables.com/convert/...al.html?x=FEFF