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GUI Permissions

See original GitHub issue

Hi Linus! I have ran the following command:

echo 'SUBSYSTEM=="backlight",RUN+="/bin/chmod 666 /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power /sys/devices/platform/ff150000.i2c/i2c-3/3-0045/tinker_mcu_bl
"' | sudo tee -a /etc/udev/rules.d/backlight-permissions.rules

Note, I ran for both the TinkerBoard and the Pi files, as all files exist on my OS. This does not fix the permissions for me.

Sidenote, I actually had to replace the %k with rpi_backlight:

echo 'SUBSYSTEM=="backlight",RUN+="/bin/chmod 666 /sys/class/backlight/rpi_backlight/brightness /sys/class/backlight/rpi_backlight/bl_power /sys/devices/platform/ff150000.i2c/i2c-3/3-0045/tinker_mcu_bl
> "' | sudo tee -a /etc/udev/rules.d/backlight-permissions.rules

as I got:

chmod: cannot access '/sys/class/backlight/%k/brightness': No such file or directory
chmod: cannot access '/sys/class/backlight/%k/bl_power': No such file or directory

Just wondering if you have any idea why both the udev rule wouldn’t work, nor the %k in that rule?

Issue Analytics

State:
Created 3 years ago
Comments:5 (5 by maintainers)

Top GitHub Comments

1reaction

p1r473commented, Apr 25, 2020

Not sure if it was a problem with the echo or the tee, but just manually creating the file seems to work: /etc/udev/rules.d/backlight-permissions.rules:

SUBSYSTEM=="backlight",RUN+="/bin/chmod 666 /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power /sys/devices/platform/ff150000.i2c/i2c-3/3-0045/tinker_mcu_bl"

Thanks!

0reactions

linusgcommented, Apr 25, 2020

Weird! Glad you got it working though, thanks for reporting back!

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