Update to volumio 3.569 breaks GPIO (permission)

Help and Support
1

Hi volumio makers,

is there a detailed changelog between version 3.546 and 3.569.
Since 3.569 pirate audio plugin isn’t working anymore because of the following error:

volumio@volumio:/data/plugins/system_hardware/pirateaudio$ python3 ./display.py
Traceback (most recent call last):
  File "./display.py", line 39, in <module>
    offset_top=0  # v0.0.6
  File "/usr/local/lib/python3.7/dist-packages/ST7789/__init__.py", line 139, in __init__
    GPIO.setup(dc, GPIO.OUT)
RuntimeError: No access to /dev/mem.  Try running as root!

I guess somehow all plugin which uses the RPI.gpio library in combination with python 3 are affected.

Temporaly fix (until reboot): sudo chown root:gpio /dev/gpiomem && sudo chmod g+rw /dev/gpiomem

Looking forward to get some tips.

Regard

AxLED

1 Like
2

Can some Volumio 3.546 pi user post the content of /etc/udev/rules.d/92-gpio.rules?

In 3.569 it is:

SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", PROGRAM="/bin/sh -c 'chown volumio:volumio /sys/class/gpio/export /sys/class/gpio/unexport ; chmod 220 /sys/class/gpio/export /sys/class/gpio/unexport'"
SUBSYSTEM=="gpio", KERNEL=="gpio*", ACTION=="add", PROGRAM="/bin/sh -c 'chown volumio:volumio /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value ; chmod 660 /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value'"

AxLED

3

here the fix for this problem

The actual bug and resolution is mentioned here:
raspberrypi/linux#5625

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4

It will be included in the next stable release

5

@Darmur

that was quick. Thanks for the hint, this fixes the gpio permission problem.
Do you know when the next stable release will be published?

AxLED

6

No plans yet, we’re testing a new version of MPD that will solve some corner-case problems with DSD playback… I don’t know how long it will take

I can trigger a test build next week, including this fix

1 Like
7

So for any other stumbling upon it and like me can’t wait for the next stable to fix this: You can fix this right now with

sudo sed -i 's/bcm2835-gpiomem/gpiomem/g' /etc/udev/rules.d/99-com.rules

It is also a good idea to make a backup of /etc/udev/rules.d/99-com.rules before this operation.
And be sure to really be on kernel 6.1.54 or newer - not to make things worse :wink:

1 Like
8

This update coincided with me making some modifications with a soldering iron to my project so thought i’d killed my VFD! Glad it’s just udev rules. All good now