Re: Backlight mystery - anyone shed light?
I'm taking a stab in the dark here (pun intended)...
do you happen to have a /run directory?
I had some issues with devices not being detected on boot recently which turned out to be related to udev attempting to read from /run.
In my case I removed /run and everything was back to normal. If you have no /run then sorry for the dull response.... :)
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