[Bug 1807250] Re: At some point in the 18.04 cycle, /sys/bus/iio has disappeared from my system

I just tried booting into 4.15.0-20 as the release pocket has it still
and it also failed to work. So now I'm wondering if/when it did work. I
will try and narrow it down in the next few days.

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https://bugs.launchpad.net/bugs/1807250

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

Status in linux package in Ubuntu:
Confirmed

Bug description:
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.

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