Add udev rules for Linux sysfs power switching to README.md

The udev rules for the sysfs case are a bit more complex than those for the
libusb based interface, as udev has built-in support for changing permissions
on device files but not for sysfs attributes.
Instead we have to use chmod / chown to set permissions and owners.

Signed-off-by: Leonard Göhrs <[email protected]>

Author: hnez

README.md

@@ -211,6 +211,36 @@ USB device into the same physical USB port (this method is also used in Linux ke
 Linux USB permissions
 =====================
 
+Kernels after 6.0
+-----------------
+
+On Linux Kernel 6.0 and later (e.g. `uname -r` shows a version numer greater or equal to 6.0) there is
+a standard interface to turn USB hub ports on or off.
+To use it as non-root user add a udev rule like the following to the file `/etc/udev/rules.d/52-usb.rules`
+to allow any user on the system to turn hub ports on and off:
+
+    SUBSYSTEM=="usb", DRIVER=="hub", \
+      RUN="/bin/sh -c \"chmod --silent 666 $sys$devpath/*-port*/disable\""
+
+If you don't like wide open mode `0666`, you can restrict access by group by using a rule like the
+following instead:
+
+    SUBSYSTEM=="usb", DRIVER=="hub", \
+      RUN+="/bin/sh -c \"chown root:dialout $sys$devpath/*-port*/disable\"" \
+      RUN+="/bin/sh -c \"chmod 660 $sys$devpath/*-port*/disable\""
+
+and then add permitted users to `dialout` group:
+
+    sudo usermod -a -G dialout $USER
+
+For your `udev` rule changes to take effect, reboot or run:
+
+    sudo udevadm trigger --attr-match=subsystem=usb
+
+
+Kernels before 6.0
+------------------
+
 On Linux, you should configure `udev` USB permissions (otherwise you will have to run it as root using `sudo uhubctl`).
 To fix USB permissions, first run `sudo uhubctl` and note all `vid:pid` for hubs you need to control.
 Then, add one or more udev rules like below to file `/etc/udev/rules.d/52-usb.rules` (replace 2001 with your vendor id):