Hyperpixel installed but not working, and HDMI output still on


#1

Hi,

I picked up a Hyperpixel from CPC a few weeks ago and fitted it to a new RPi3 running the latest image of Raspbian Stretch. After running the installer, it became apparent the screen was damaged, so I sent it back to CPC and had it swapped for another one.

In the meantime, I ended up reinstalling Stretch on the card so I could continue to use the Pi for another project while I waited for the replacement to arrive. I decided that instead of running the installer again on this installation and undoing the work I’d already done. I purchased an additional storage card and put Stretch on that, so could keep both projects separate.

Now the screen has arrived, I’ve installed the software from Github and then powered down and fitted the screen. This time, the HDMI output is still on, and other than a couple of flickers from the Hyperpixel, nothing appears on it. It seemed to me that install had somehow failed silently as the HDMI was still working. But the installer gives little away and there doesn’t appear to be much in the syslog.

Any ideas? It seems awfully bad luck to have had two faulty units.


#2

In the true Internet tradition of spending hours trying to figure something out then minutes after posting something on the 'net about it, you immediately find the solution yourself…

It appears you can’t enable hardware GL support and have the HyperPixel work. As soon as I disabled it in the rpi config utility, it removed the vc4-fkms-v3d overlay line from config.txt and the display sprang into life.

Interestingly, I notice that this screen has a very pale ‘halo’ effect in the middle, which appears very slightly lighter, I assume down to the manufacturing process. But it works, and I don’t think I can bother going through the RMA process again…


#3

Thank you for taking the time to post the solution! And I’m glad you’re up and running.

Could you possibly get an image of the pale halo effect? It’s not something I recall seeing, but the display is edge-lit with a row of LEDs shining into a light-channel/diffuser (I may have pulled one to pieces), so it could be an optical thing.


#4

Hi there,

Unfortunately I removed the screen to work on something else, and upon reattaching it, the halo effect is gone. I wonder if was the diffuser being squashed or flexed slightly that was causing it.

Anyway, it’s all sorted now. If it reappears, I’ll grab a snapshot of it.


#5

Haha! If anything I’d say it’s fortunate. Saves you the trouble of worrying about it.