Rpi 4B + Waveshare 7.9" simply cannot see Emteria boot logo
Hi folks - 22nd straight hour of troubleshooting (4 hours per day since last Wednesday) and I'm at wit's end. Some help would be much appreciated.
I have a RPi 4B 8GB and the reportedly supported Waveshare 7.9" display. No matter what I try, I simply cannot get to the Emteria boot logo. FWIW, The basic Raspberry Pi Debian build works flawlessly after adding the Waveshare HDMI lines to config.sys.
Here's what I've tried:
In this thread, in the second comment, OP says he has same setup as me. He says
In addition to this I want to add that the same RPI [4B] with the same Emteria.OS [11.3.0] installed on it works well with my PC's screen and with another Waveshare screen (with this one https://www.waveshare.com/7.9inch-hdmi-lcd.htm ) and does it out-of-box.
(a) I tried the same thing: flash from tool > eject > + boot from SD card
upon applying power, a distorted rainbow shows up, which fades out and stays black.
(b) I added the Waveshare code at the bottom of config.sys
hdmi_timings=400 0 100 10 140 1280 10 20 20 2 0 0 0 60 0 43000000 3
Better! upon applying power, a single clear rainbow square shows up, followed by a fast scroll of text (with 4x raspberries on top), but immediately after this, the screen turns black (presumably here is when the Emteria logo should have shown).
(c) I commented out
The same text scrolling shows up, but is slower and continues infinitely like OP states in the thread above
(d) I un-commented the line and added an F for fake kms to make
Same result as (c).
(e) I went back to (b) and kept
dtoverlay=vc4-kms-v3d-pi4,noaudio but commented out
Same result as (b).
Now when I look at config.sys, mysteriously, my timings line has disappeared from the config.sys and a
cma-256 has shown up before
noaudio in the kms line
(f) I added the timings line again, kept
dtoverlay=vc4-kms-v3d-pi4,cma-256,noaudio untouched and
disable_fw_kms_setup=1 commented out
A clear rainbow square shows up, followed by the infinite scrolling text BUT the text is interlaced and unreadable.
I've tried versions 11.8.0, 11.6.0, 11.5.0 with all variations above. I think I have close to 400 boots on my raspberry pi at this point, which is probably bad for its electronics, so before I fry the components - what can I do to get this to boot?