Waveshare 7inch (C) overscan

Henrik_Berg · May 15, 2024, 9:36am

Hi

I have tried to find a solution to this but I haven’t been successful. If it’s already been solved, please excuse me, and point me i the right direction.

I just installed Volumio (ver. 3.661) on a Raspberry Pi 4B with a Waveshare 7inch(C) touch screen connected via HDMI and USB. I have installed the touch screen plugin (ver. 3.4.0).

When I started Volumio the first time the screen resolution was wrong so I edited the userconfig.txt file to get the screen to “fill out”. Before that Volumio was only showing up in a portion of the screen.

hdmi_group=2
hmdi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1

The problem I have now is that Volumio spills over the screen, so the whole UI isn’t showing. It’s as if Volumio isn’t adapting to the resolution of my screen.

Gelo5 · May 15, 2024, 2:38pm

Write in userconfig:
disable_overscan=1

Henrik_Berg · May 15, 2024, 3:31pm

That didn’t work. It still looks the same. Is it possible that something went wrong during installation? Should I have made the additions to userconfig before installing the tpuch screen plug in?

Wheaten · May 15, 2024, 3:32pm

All you manual contributions needs to be in userconfig, otherwise they will be lost during an update.

gvolt · May 15, 2024, 3:36pm

Not necessarily, but a reboot is required after making changes to “/boot/userconfig.txt”.

Try adding

max_framebuffer_width=1024
max_framebuffer_height=600
framebuffer_width=1024
framebuffer_height=600

to “/boot/userconfig.txt”.

Henrik_Berg · May 15, 2024, 3:38pm

Everything is in userconfig. As 8f now its the four lines in the original post and the overscan_disable line. It’s like volumio doesn’t get what resolution the screen is. The touch funktion works. If i touch the upper right corner i close open windows even though the “X” is outside of the screen.

Henrik_Berg · May 15, 2024, 3:40pm

I always reboot I’ll try adding this. I think I have tried that, but maybe not together with the overscan setting.

Henrik_Berg · May 15, 2024, 6:17pm

Thanks for helping! I tried adding the framebuffer lines. It didn’t work. Now i get a black band on the left side, and it also looks like volumio is “zoomed” in a bit more.

Current settings are:

hdmi_group=2
hmdi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1
disable_overscan=1
max_framebuffer_width=1024
max_framebuffer_height=600
framebuffer_width=1024
framebuffer_height=600

I commented out all the lines in userconfig to get a picture of how it looks without anything. I case that might help.

Is it possible that it would work if i add a “hdmi_timings=” line? I’ve found EDID Sequence Parameters for the display at https://www.waveshare.com/wiki/7inch_HDMI_LCD_(C) but I don’t know how to use them correctly. Or if it would make a difference.

gvolt · May 15, 2024, 6:38pm

Did you check how it looks without disable_overscan=1?

I had “hdmi_timings” in mind too. Please execute

sudo /opt/vc/bin/tvservice -d edid.dat

and upload the resulting “edid.dat” file.

Henrik_Berg · May 15, 2024, 7:21pm

It looks the same without disable_overscan=1.

How do i get the dat-file from the Raspberry? Do I have to put the memory card in a computer that runs linux or is there’s an easier way?

gvolt · May 15, 2024, 7:45pm

You can use a file explorer that is able to connect to Volumio via sftp. Or execute

cp ~/edid.dat /mnt/INTERNAL/

on Volumio’s command prompt to copy the file to “/mnt/INTERNAL/” which is a Samba share and should be accessible from your computer.

Henrik_Berg · May 15, 2024, 8:10pm

I wasn’t allowed to upload a dat file, so i zipped it.

edid.zip (170 Bytes)

gvolt · May 15, 2024, 9:26pm

Try these settings in “/boot/userconfig.txt”:

hdmi_group=2
hmdi_mode=87
hdmi_timings=1024 0 48 96 144 600 0 3 10 11 0 0 0 60 0 49000000 7
hdmi_drive=1
max_framebuffer_width=1024
max_framebuffer_height=600
framebuffer_width=1024
framebuffer_height=600

Henrik_Berg · May 16, 2024, 6:48am

This didn’t work either. It looks like before. I tried commenting out the framebugger lines and it went back to looking like in the first pictures, without the black band on the left side. This is a little bit frustrating

gvolt · May 16, 2024, 7:01am

Just realized I mistyped the last value of “hdmi_timings”. It should read “6” instead of “7”. Not sure this will make a difference…

Henrik_Berg · May 16, 2024, 8:29am

It didn’t change anything. I tried uncommenting everything and connect it to my PC-monitor. It shows the whole UI but at a very low resolution. But nothing is missing.

gvolt · May 16, 2024, 8:32am

Does adding hdmi_ignore_edid=0xa5000080 to “/boot/userconfig.txt” so it looks like

hdmi_ignore_edid=0xa5000080
hdmi_group=2
hmdi_mode=87
hdmi_timings=1024 0 48 96 144 600 0 3 10 11 0 0 0 60 0 49000000 7
hdmi_drive=1
max_framebuffer_width=1024
max_framebuffer_height=600
framebuffer_width=1024
framebuffer_height=600

possibly help?

Henrik_Berg · May 16, 2024, 9:18am

No. It didn’t help. But the screen looks like this now.

gvolt · May 16, 2024, 9:35am

Another option after reverting hdmi_ignore_edid=0xa5000080 could be to use the scaling option from the Touch Display plugin’s config page. Set the scale factor to e.g. 95.

Henrik_Berg · May 16, 2024, 10:27am

The only thing that happens is that the menu-button and the other buttons get smaller. The image changes size to, but gets bigger when I go lower. It seems like Volumio thinks the display is bigger than it is