Black screen on hdmi display 1280x480

VIM1S
1

Hello everyone! Searching the forum I found out that this non-standard resolution (1920*480) is not added to the board. In raspberry boards this can be done using the download file. Timings are known for the monitor, but they are for raspberry.

Max_framebuffer_height = 1920
Hdmi_mode = 87
Hdmi_group = 2
Hdmi_force_mode = 1
Hdmi_timings = 480 0 30 30 30 1920 0 18 6 6 0 0 60 0 66280000 3

I tried changing the resolution with the utility fbset, but without result.
display EDID:
00ffffffffffff00ffff3231450600000c1c0103800f0a780a0dc9a05747982712484c00000001c1010101c101010101010101010101e419e05a108012701e1e6600e0801700001ee419e05a108012701e1e6600052800202020000000fa000a20202020020020202020200a000000fc005a65726f4d4f440a202020202000bc

Which system do you use? Android, Ubuntu, OOWOW or others?

Ubuntu

Which version of system do you use? Please provide the version of the system here:

24.04

2

Hello @George_Kolesnikov

As we don’t have such screen on our side, could you help us to test on your side?

Based on image ubuntu-24.04/vim1s-ubuntu-24.04-xfce-linux-5.15-fenix-1.7-240926.img.xz and follow the steps below to upgrade the kernel:

wget https://dl.khadas.com/.test/vim1s/linux-dtb-amlogic-5.15_1.7.2_arm64.deb
wget https://dl.khadas.com/.test/vim1s/linux-image-amlogic-5.15_1.7.2_arm64.deb
sudo dpkg -i linux-dtb-amlogic-5.15_1.7.2_arm64.deb linux-image-amlogic-5.15_1.7.2_arm64.deb
sync
sudo reboot

After reboot, please check whether it works and provide the below information to us.

$ dmesg
$ cat /sys/class/display/mode
$ cat /sys/class/drm/card0-HDMI-A-1/modes 
$ cat /sys/class/amhdmitx/amhdmitx0/disp_cap 
$ edid-decode < /sys/class/amhdmitx/amhdmitx0/rawedid
3

Thank you for your reply! I am sending the requested information:
File output dmesg link:

root@Khadas:~# cat /sys/class/display/mode
1080p60hz
root@Khadas:~# cat /sys/class/drm/card0-HDMI-A-1/modes
480x1920p60hz
dummy_l
root@Khadas:~# cat /sys/class/amhdmitx/amhdmitx0/disp_cap
480x1920p60hz
480x1920p60hz
root@Khadas:~# edid-decode < /sys/class/amhdmitx/amhdmitx0/rawedid
edid-decode (hex):

00 ff ff ff ff ff ff 00 ff ff 32 31 45 06 00 00
0c 1c 01 03 80 0f 0a 78 0a 0d c9 a0 57 47 98 27
12 48 4c 00 00 00 01 c1 01 01 01 c1 01 01 01 01
01 01 01 01 01 01 e4 19 e0 5a 10 80 12 70 1e 1e
66 00 e0 80 17 00 00 1e e4 19 e0 5a 10 80 12 70
1e 1e 66 00 05 28 00 20 20 20 00 00 00 fa 00 0a
20 20 20 20 02 00 20 20 20 20 20 0a 00 00 00 fc
00 5a 65 72 6f 4d 4f 44 0a 20 20 20 20 20 00 bc

----------------

Block 0, Base EDID:
  EDID Structure Version & Revision: 1.3
  Vendor & Product Identification:
    Manufacturer: ___
    Model: 12594
    Serial Number: 1605
    Made in: week 12 of 2018
  Basic Display Parameters & Features:
    Digital display
    Maximum image size: 15 cm x 10 cm
    Gamma: 2.20
    RGB color display
    First detailed timing is the preferred timing
  Color Characteristics:
    Red  : 0.6250, 0.3398
    Green: 0.2802, 0.5947
    Blue : 0.1552, 0.0703
    White: 0.2832, 0.2978
  Established Timings I & II: none
  Standard Timings:
  Detailed Timing Descriptors:
    DTD 1:   480x1920   60.000362 Hz   1:4    116.281 kHz     66.280000 MHz (480 mm x 1920 mm)
                 Hfront   30 Hsync  30 Hback   30 Hpol P
                 Vfront    6 Vsync   6 Vback    6 Vpol P
    DTD 2:   480x1920   60.000362 Hz   1:4    116.281 kHz     66.280000 MHz (analog composite, sync-on-green, field sequential L/R, 5 mm x 40 mm)
                 Hfront   30 Hsync  30 Hback  -34 Hpol N Hborder 32
                 Vfront    6 Vsync   6 Vback  -58 Vpol N Vborder 32
    Standard Timing Identifications:
      GTF     :   328x205    92.001317 Hz  16:10    19.964 kHz      7.826000 MHz
      GTF     :   504x315    92.000228 Hz  16:10    30.636 kHz     19.362000 MHz
      GTF     :   504x315    61.997961 Hz  16:10    20.273 kHz     12.164000 MHz
      GTF     :   504x315    92.000228 Hz  16:10    30.636 kHz     19.362000 MHz
      GTF     :   504x315    92.000228 Hz  16:10    30.636 kHz     19.362000 MHz
    Display Product Name: 'ZeroMOD'
Checksum: 0xbc
4

It seems that the resolution is detected, can you setup this resolution in the system settings?

5

in graphic mode if you connect another monitor this resolution is not.
in the file /boot/uEnv.txt added the line
video=HDMI-A-1:480x1920@60,if=RGB24
on reboot still black screen

[  +1.475875] [drm:meson_hdmitx_atomic_check [aml_drm]] *ERROR* hdmitx_on changed, force modeset.
[  +0.000717] [hdmitx:] *ERROR* hdmitx_common_validate_mode_locked: get vic from (480p56hz) fail
[  +0.001257] [drm:meson_hdmitx_encoder_atomic_check [aml_drm]] *ERROR* validate_mode fail for [480p56hz-rgb,8bit]
6

Hello @George_Kolesnikov

OK, it looks we need further debug on this screen, could you share the screen buy link to us?

7

yes, of course, here is this link:

8

Hello @George_Kolesnikov

We will try to find same screen and debug on our side and will update you here.

9

Hello! Were you able to test the monitor?

10

Hello @George_Kolesnikov

Yes, we are work on it.

11

Hello! Nothing new yet?

12

Hello @George_Kolesnikov

Sorry, we are still working on it, we will let you know once we have improgress.