Please Help configurate my 800x800 px round screen (blank screen)

Vahag

Hi guys, Im an absolutly noob with raspberry pi and emteria. My circular Display shows me a black screen when I run Emteria OS for the first time.

with the following settings in rasbian os it works great but on Emteria which I purchased a few hours ago, it shows me only a black screen...

force_trubo=1
gpu_freq=300
core_freq=400

HDMI Basic configuration

hdmi_pixel_freq_limit=400000000
hdmi_timings=800 0 40 12 40 800 0 12 12 12 0 0 0 60 0 44740000 0
hdmi_drive=2
disable_overscan=1
max_framebuffer_width=2560
max_framebuffer_height=2560

Portrait or Landscape Setting

#Portrait-1 Flexible cable is bottom side.)
display_rotate=0
framebuffer_width=800
framebuffer_height=800

For more options and information see

http://www.raspberrypi.org/documentation/configuration/config-txt.md

Some settings may impact device functionality. See link above for details

uncomment if you get no picture on HDMI for a default "safe" mode

hdmi_safe=1

uncomment this if your display has a black border of unused pixels visible

and your display can output without overscan

#disable_overscan=1

uncomment the following to adjust overscan. Use positive numbers if console

goes off screen, and negative if there is too much border

#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

uncomment to force a console size. By default it will be display's size minus

overscan.

#framebuffer_width=1280
#framebuffer_height=720

uncomment if hdmi display is not detected and composite is being output

#hdmi_force_hotplug=1

uncomment to force a specific HDMI mode (this will force VGA)

#hdmi_group=1
#hdmi_mode=1

uncomment to force a HDMI mode rather than DVI. This can make audio work in

DMT (computer monitor) modes

#hdmi_drive=2

uncomment to increase signal to HDMI, if you have interference, blanking, or

no display

#config_hdmi_boost=4

uncomment for composite PAL

#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

Uncomment some or all of these to enable the optional hardware interfaces

#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

Uncomment this to enable the lirc-rpi module

#dtoverlay=lirc-rpi

Additional overlays and parameters are documented /boot/overlays/README

Enable audio (loads snd_bcm2835)

dtparam=audio=off

Please, can someone explain me what I do wrong?

Cee123

Don't know if this would work for you (and there are no guarantees) but have you tried this?

Changing the line:
dtoverlay=vc4-kms-v3d,cma-256
to
dtoverlay=vc4-fkms-v3d,cma-256

That was the only line in the config I needed to change to make it display on my TV.

Vahag

Hi, thanks for your answer. It was allready changed when I looked into config.txt. Dont know why but it doesnt work for me.
Anyway thanks for your help

Cee123

You could try change it the other way around and see if that works. If not, must be something else.

Vahag

Ok I will try it tomorrow and write back 🙂

Cee123

Well, any news? Did you fix the problem or still the same? Sorry I couldn't be more help.

Cee123

I have another question. What resolution and refresh rate were you using? And are you using DVI or HDMI?

hdmi_cvt=1920 1080 60 6 0 0 0

Above is the setting for 1920x1080 (1080p) 60Hz refresh rate.

Vahag

Hi I found out that my mipi to hdmi board was broken. xD its working now, But I cant finish my project with the raspberry pi 3. Its to weak. 4 is out now but no support for android. I switched to rock pi 4b and its a rocket, not a rock 😁

Cee123

Nice! Might have to get one of those Rock Pi 4b boards. But I have an Odroid XU4 and it's pretty powerful. Also supports Android (that you can get for free). Such a cool little board. I love it. Only downside is you have to buy the wifi and bluetooth dongles separate.

Vahag

@Cee123 yeah I wanted to buy it at first but then decided for the rockpi because here its included(b-version) problem is comunity is way smaller then the one from odroid. If you need help by setting up something, you have to wait a lot and ask everybody you see xD