Public bug reported:

I have a Yoga 900-13ISK and a Thinkpad T470s. Both have had working
screen rotation in the past. However, I noticed today while supporting a
user in #ubuntu, neither do now. No icon in the Gnome menu and:

# G_MESSAGES_DEBUG=all iio-sensor-proxy 
** (process:14877): DEBUG: 12:31:21.603: Could not find any supported sensors

Indeed, /sys/bus/iio does not exist! I believe this is distinct from LP:
#1792813, as I have just tested mainline 4.19 and it also does not work.

I am working on getting more data, including testing older kernels from
18.04, but it might take me some time.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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  At some point in the 18.04 cycle, /sys/bus/iio has disappeared from my

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