Troubleshooting • Screen occasionally not waking after screen blanking

I'm evaluating the ReTerminal DM from Seeed Studio (I have three of them and see the issue on all three) which runs a CM4 and the Raspberry Pi OS:

https://www.seeedstudio.com/reTerminal-DM-p-5616.html

I'm running into an issue with screen blanking. The screen blanks ok after ten minutes, but about once every 30 times I touch the screen to wake it up, the screen doesn't wake up. Seeed tech support said it was a known issue with the Raspberry Pi OS and there was nothing they could do. Is this true? Are there any work arounds?

I see the issue with both buster and bookworm, 32 bit and 64 bit. Sometimes the backlight comes on but no screen images. Sometimes I see a screen image but no backlight. Sometimes I get neither.

Seeed's solution was to SSH into the device and issue a couple xset commands:
This works but we can't expect customers to ssh into the device and run these commands when this happens.

When the screen doesn't wake up and I issue the following command:
DPMS thinks the monitor is on. When the screen doesn't come on and I wait another then minutes before touching the screen, it will usually come on.

Thanks,
Craig

Statistics: Posted by cvboucher — Mon Jun 17, 2024 10:11 pm

---