recalbox not work well with DPI LCD on 4B

[DRAgon734235]

@Zing

if I use HDMI LCD . the same image with HDMI configuration will work well

[Zing]

@DRAgon734235 I just realized that you are referring to a DPI screen, and I was thinking it was a DVI screen, sorry for the mistake.

I just realized that you are referring to a DPI screen, and I was thinking it was a DVI screen, sorry for the mistake.

You need to read these tutorials:

• https://recalbox.gitbook.io/documentation/tutorials/video/display-configuration/complete-guide-on-video-configuration

• https://recalbox.gitbook.io/documentation/tutorials/video/tft/setting-up-your-small-tft-screen-on-the-dpi-bus

• https://recalbox.gitbook.io/documentation/tutorials/video/display-configuration/adjusting-the-image-size-using-overscan

[DRAgon734235]

@Zing

hello， thank for your replay， I think that three wenlink just work for 3B ， Not 4B

Now I am the 4B DPI problem， at 3B ， the DPI LCD display well 。

I have tried this weblink
https://recalbox.gitbook.io/documentation/tutorials/video/tft/setting-up-your-small-tft-screen-on-the-spi-bus
That just work for 3B ， not work for 4B ，

also tryed this
https://recalbox.gitbook.io/documentation/tutorials/video/tft/second-minitft-for-scrapes-and-videos-ogst-case-raspeberry-pi-1-2-3-spi-dpi-small-tft-screens
add the code

system.secondminitft.enabled=1

this code not have any effect

==================================================
This is my problem， the DPI lcd work well at 3B ， not work well at 4B
your weblink for reference just for 3B not solve 4B problem

[ian57]

@DRAgon734235 that's srtrange but it may comes from the Pi4 3D Accel. Try to comment out the 3D acceleration for pi4 to fall back in Pi3-like running.
With Pi4 3D accel, only 180° rotation is allowed in framebuffer, 90 and 270 do not work

You need to comment

#dtoverlay=vc4-kms-v3d

in /boot/config.txt
After you should able to rotate the display as in your Pi3 config.

[DRAgon734235]

@Zing
DPI LCD same configuration 3B work well

But 4B just stay at this recalbox logo image

[DRAgon734235]

@ian57 said in recalbox not work well with DPI LCD on 4B:

#dtoverlay=vc4-kms-v3d

After comment
#dtoverlay=vc4-kms-v3d

Still stay at recalbox logo image

[ian57]

@DRAgon734235 seems that Emulationstation does not like unaccelerated Pi4 config.

When I'll have some time will check on my geekworm dpi screen

[DRAgon734235]

@ian57 said in recalbox not work well with DPI LCD on 4B:

geekworm

OK ，

think you

[DRAgon734235]

@ian57 @Zing

have news ？

[ian57]

@DRAgon734235 Hi,

It works well... but no rotation 90/270° available from the firmware and the overlay... the fondation doc DOES NOT work!

perhaps a lead.. i read something about that the kernel 5.10 supports all rotation from the accelerated overlay... so we need to b*mp to test...

As a sum up ... All the screen are working with acceleration but no 90° 270° actually
only 180°

[DRAgon734235]

my 4b stay at this

Do you have any suggestion ？ （Even in “rotate=0” ）

[DRAgon734235]

@ian57
Do you have any suggestion ？

[ian57]

@DRAgon734235 hdmi or dpi ?
which screen ?

[DRAgon734235]

@ian57
https://www.aliexpress.com/item/1005001659074233.html?spm=a2g0o.productlist.0.0.9cc286b4PDloaM&algo_pvid=05efcf4a-b64c-4624-b3b0-7450fe193177&algo_expid=05efcf4a-b64c-4624-b3b0-7450fe193177-13&btsid=0b86d81616125235002752171e1e1f&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

Waveshare 2.8inch dpi LCD

[ian57]

@DRAgon734235 this screen has 480x640 resolution so you need to rotate it (90 or 270). Actually it seems not to be supported in frambuffer, only with xrandr in GUI. I saw this https://www.raspberrypi.org/documentation/configuration/cmdline-txt.md and tried it but it only works with 0-180° not with 90-270.

[DRAgon734235]

@ian57

I do not rotate the LCD with 90 or 270, the LCD display as the default direction like this image

and the recalbox stay at this picture always

[ian57]

@DRAgon734235 I think you need to use the fdmk overlay instead of the dmks overlay : here is may configuration for my 800x480 dpi screen

temp_soft_limit=70
dtoverlay=vc4-fkms-v3d
 
 
# custom config
[all]
#3.5 HD tft screen 800x480
dtoverlay=dpi18
disable_overscan=1
 
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
 
hdmi_force_hotplug=1
 
 
#geekwrom
framebuffer_width=800
framebuffer_height=480
#dtparam=spi=off
#dtparam=i2c_arm=off
enable_dpi_lcd=1
display_default_lcd=1
dpi_output_format=0x6f015
dpi_group=2
dpi_mode=87
hdmi_timings=480 0 16 16 24 800 0 4 2 2 0 0 0 60 0 32000000 6
#display_rotate=3

[DRAgon734235]

@ian57
I use recalbox-rpi4 7.1

this is my code ：

dtoverlay=vc4-fkms-v3d
max_framebuffers=1
overscan_scale=1

overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0

hdmi_force_hotplug=1

framebuffer_width=480
framebuffer_height=800

gpio=0-9=a2
gpio=12-17=a2
gpio=20-25=a2
dtoverlay=dpi18
enable_dpi_lcd=1
display_default_lcd=1
#extra_transpose_buffer=2
dpi_group=2
dpi_mode=87
dpi_output_format=0x7F216
hdmi_timings=480 0 26 16 10 640 0 25 10 15 0 0 0 60 0 32000000 1
dtoverlay=waveshare-28dpi-3b-4b

The recalbox still stay at that recalbox logo picture always

[DRAgon734235]

@ian57

Your recalbox is 4.6 ？

[ian57]

@DRAgon734235 nop, 7.2 beta do you have something connected on HDMI?