Raspberry Pi 4B missing i2c-1

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Raspberry Pi 4B missing i2c-1

Postby Tota » Mon Feb 08, 2021 11:09 am

After enabling i2c-1 in config.txt it does not show up (ls /dev/), instead one only sees i2c-11 and i2c-12. Seems i'm not the only one with this problem: https://www.raspberrypi.org/forums/view ... 3&t=302999 I'm not the OP.

From the linked thread: $this->bbcode_second_pass_quote('', 'A')nother way is change "dtoverlay=vc4-kms-v3d" to "dtoverlay=vc4-fkms-v3d" in config.txt.


Not sure this is expected from ALARM's side and wanted to raise awareness in case people do not follow the official raspberry pi forums. Hope this may help someone.

Using the raspberry pi kernel (formerly from graysky, now official), 5.10.13 (latest). (system is fully up-to-date)
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Re: Raspberry Pi 4B missing i2c-1

Postby graysky » Mon Feb 08, 2021 11:51 am

Thanks for sharing this info. As a temp. fix, you can switch to fkms of course.
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Re: Raspberry Pi 4B missing i2c-1

Postby steadybright » Fri Feb 12, 2021 9:27 pm

I switched to fkms as well, which resolved the i2c issue, it did however break my analog audio via the RPi-4B jack.

That's fixed now. More info for anyone else in the same situation:
https://www.raspberrypi.org/forums/viewtopic.php?f=53&t=302999&p=1818765&hilit=i2c+audio#p1818795

Best of luck!

sb
People are illogical, unreasonable, and self-centered. Love them anyway.
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Re: Raspberry Pi 4B missing i2c-1

Postby steadybright » Tue Mar 02, 2021 4:27 am

This seems to be resolved with latest updates. No i2c issue with default kms overlay.

sb
People are illogical, unreasonable, and self-centered. Love them anyway.
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