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thes3pt3mb3r

Member

Registered: 2026-04-11

Posts: 5  

HDMI touchscreen display doesn't really display

I have https://www.waveshare.com/wiki/7inch\_HDMI\_LCD_(C), version Rev4.1. When I connect it to my ARM board, nothing shows up (the screen only lights up slightly) even though the LED dot is blinking, indicating that Devuan is starting/running.

I possess an MSI monitor that also uses HDMI for display and it works, so I don’t understand what’s wrong with the former device.

One more thing mentioned in the instructions is setting the right resolution by pasting:
'hdmi_group=2
hdmi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1' at the end of the config.txt file that is found on the TF card after flashing the Raspberry Pi image, but I do not know how to do this on Devuan because these instructions are only focused on Raspberry Pi OS.

I asked Waveshare about this and they said that the Linux kernel itself should support it. They did not help me much.

I do not know if there is any problem with the touch part of this device yet.

Last edited by thes3pt3mb3r (Yesterday 13:04:44)

rbit

Member

Registered: 2018-06-12

Posts: 113  

Re: HDMI touchscreen display doesn't really display

Is the arm system already up and running when you plug in the screen?
If so, try shutting it off, plug in the screen, then power the system back on.  Does anything come on the display screen now?

The config.txt file should be in /boot directory.

thes3pt3mb3r

Member

Registered: 2026-04-11

Posts: 5  

Re: HDMI touchscreen display doesn't really display

No, what you wrote  doesn't really do anything.

I had screen plugged before turning it on, but I do not see what the issue is?

if my more 'PC' monitor didn't pose any issues like that,they both used standard HDMI interface for displaying although waveshare device additionally uses usb for touch.

Also I feel that it is important to mention that OS I use is basically DietPi's Debian converted to Devuan so, there is no config.txt in /boot dir.