[solved] RPi 7" Touch Screen Display on RPi 3B not working?

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[solved] RPi 7" Touch Screen Display on RPi 3B not working?

Postby 2sdude » Tue Jan 11, 2022 9:38 pm

After my Jan 11 update (first updates since early Dec) the screen shows all the boot messages (AFAIK), but when it appears done booting the screen fades, becomes unreadable and is shaking. I lon the past,oked at dmesg and journalctl but didn't see any error messages.

I have been turning the screen off using "echo 1 > /sys/class/backlight/rpi_backlight/bl_power".
However, as of Jan 11 "ls /sys/class/backlight/" shows no files/folders including no folder named "rpi_backlight".

How to troubleshoot or fix or what to rollback?
Last edited by 2sdude on Thu Jan 13, 2022 12:18 am, edited 1 time in total.
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Re: RPi 7" Touch Screen Display on RPi 3B no longer working?

Postby 2sdude » Tue Jan 11, 2022 11:26 pm

$this->bbcode_second_pass_quote('', 'I') lon the past,oked at dmesg and journalctl but didn't see any error messages.


"It worked in the past. I looked at dmesg and journalctl but didn't see any error messages." Not sure what happened there ...
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Re: RPi 7" Touch Screen Display on RPi 3B no longer working?

Postby 2sdude » Thu Jan 13, 2022 12:11 am

I fixed it by changing the following line in /boot/config.txt
dtoverlay=vc4-fkms-v3d

I changed KMS into FKMS
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