5 inch HDMI screen advice?

[glitchgod]

https://www.wantitall.co.za/pchardware/s...b06x9slzwc

Armbian 

I can easily use the hdmi on my raspberry pi 3 but i wish to use the HDMI on my tinkerboard.

When i plug in the micro usb (old raspi powersupply) to screen and then a (tested) HDMI cable to the board all i get is a White screen. 
This is weird to me since ive hooked my tinkerboard to 2 old HDMI computer monitors and the screen showed but this tiny one is weird.

Advice?

[update 10/2/17]
i contacted the supplier and they supplied me with a list of things to try inside the config-txt.md file

# 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

thing is for armbian i don't see that file in the raspberry pi standard location when i SSH into the tinkerboard.

My updated question is:
Is the config file in a new location or should i just create new config file and hope the tinkerboard doesnt break?

[lobo]

Maybe it is because the resolution is not defined in the rockchip hdmi kernel griver: https://github.com/TinkerBoard/debian_ke...dmi-lcdc.c

[url=https://github.com/TinkerBoard/debian_kernel/blob/linux4.4-rk3288/drivers/video/rockchip/hdmi/rockchip-hdmi-lcdc.c][/url]
On the android kernel I added a timing for an 1024x600 and made a custom kernel. If you are able to compile your custom kernel, you could try to add the timing as e.g. I made for my (you would need to search for the right values for your display):

Code:

    {
        .mode = {
            .name = "1024x600p@60hz",
            .refresh = 60,
            .xres = 1024,
            .yres = 600,
            .pixclock = 74250000,
            .left_margin = 160,
            .right_margin = 24,
            .upper_margin = 29,
            .lower_margin = 3,
            .hsync_len = 136,
            .vsync_len = 6,
            .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
            .vmode = 0,
            .flag = 0,
        },
        .vic = HDMI_VIDEO_DMT | 10,  //512 | 10
        .vic_2nd = 0,
        .pixelrepeat = 1,
        .interface = OUT_P888,
    },

And in rockchip-hdmi.h can be set the default mode to:

Code:

#define HDMI_VIDEO_DEFAULT_MODE            522 /*1024x600: 522*/

[glitchgod]

Maybe it is because the resolution is not defined in the rockchip hdmi kernel griver: https://github.com/TinkerBoard/debian_ke...dmi-lcdc.c

[url=https://github.com/TinkerBoard/debian_kernel/blob/linux4.4-rk3288/drivers/video/rockchip/hdmi/rockchip-hdmi-lcdc.c][/url]
On the android kernel I added a timing for an 1024x600 and made a custom kernel. If you are able to compile your custom kernel, you could try to add the timing as e.g. I made for my (you would need to search for the right values for your display):

Code:

    {
        .mode = {
            .name = "1024x600p@60hz",
            .refresh = 60,
            .xres = 1024,
            .yres = 600,
            .pixclock = 74250000,
            .left_margin = 160,
            .right_margin = 24,
            .upper_margin = 29,
            .lower_margin = 3,
            .hsync_len = 136,
            .vsync_len = 6,
            .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
            .vmode = 0,
            .flag = 0,
        },
        .vic = HDMI_VIDEO_DMT | 10,  //512 | 10
        .vic_2nd = 0,
        .pixelrepeat = 1,
        .interface = OUT_P888,
    },

And in rockchip-hdmi.h can be set the default mode to:

Code:

#define HDMI_VIDEO_DEFAULT_MODE            522 /*1024x600: 522*/

building a custom kernel is a bit beyond my abilities very basic java, however very interesting and something I might try.


I did how ever get an update from the supplier and have posted the new information back in first post

[f4r3l0]

To those fighting with this problem nowadays, one thing that worked for me was based on this tutorial (steemit.com/technology/@not-a-bird/tinkerboard-and-elecrow-5-inch-display) about adding a config to /etc/X11/xorg.conf.d/ but the catch was to add a resolution that was never mentioned anywhere. While trying to solve the problem I used a monitor for reference to check what was supposed to be shown and one of the times I changed from the monitor to the tinkerboard the small display worked perfectly so I decided to test the configuration used for the monitor (shown at /var/log/Xorg.0.log) on the display and it worked! Even being completely different than any reported at Xorg.0.log when the small display was .

---

[TL;DR]

• create a file "/etc/X11/xorg.conf.d/02-hdmi-5inches.conf" with the following content:
  

Section "Monitor"
    Identifier          "HDMI-1"
    ModeLine "1920x1080" 148.50  1920 2008 2052 2200  1080 1084 1089 1125 +hsync +vsync
    Option "PreferredMode" "1920x1080"
EndSection

• Reboot or restart the display manager
  

---

One might play with the numbers to achieve true 800x480 (this solution currently fits the actual 1920x1080 into the small screen) but as this solves for me I won't proceed any further.