This bug was fixed in the package iio-sensor-proxy - 2.8-1ubuntu1
---------------
iio-sensor-proxy (2.8-1ubuntu1) focal; urgency=medium
* Support polling for sensor using raw value (LP: #1926280)
d/p/0001-light-Support-sensors-using-raw-values-as-well.patch
d/p/0001-drivers-Support-multi-function-sensors.patch
-- Kai-Chuan Hsieh <[email protected]> Tue, 27 Apr 2021
17:28:32 +0800
** Changed in: iio-sensor-proxy (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1926280
Title:
ALS function lost after suspend/resume
Status in OEM Priority Project:
New
Status in iio-sensor-proxy package in Ubuntu:
Fix Released
Status in iio-sensor-proxy source package in Focal:
Fix Released
Bug description:
[Impact]
* Some Dell machine support ALS (ambient light sensor) will lost function
after suspend/resume
It originally only report iio-buffer-als by udev rule, but the buffer no
longer update after
suspend/resume, the issue can be eliminated by polling in_illuminance_raw
node.
[Test Plan]
* Boot a machine with ALS support, and check it by
$ cat /sys/bus/iio/devices/iio:device*/name => see if it contains name als
* do suspend/stress by
$ sudo -s
# for i in `seq 20`; do sleep 5; rtcwake -m mem -s 10; done
* run monitor-sensor and cover your hand on the light sensor
$ monitor-sensor
* if the als function lost, there should be no update of the ambient light
sensor anymore
[Where problems could occur]
* The change add in_illuminance_raw check and add iio-poll-als to
IIO_SENSOR_PROXY_TYPE for sensor using raw value.
* It will keep original IIO_SENSOR_PROXY_TYPE and multiple
IIO_SENSOR_PROXY_TYPE support, so risk is low for other hardware.
* Checking on working hardware and run $ monitor-sensor
it should keep popping Light changed event no matter what operations,
close lid, suspend/resume, reboot...etc.
[Other Info]
* The change is from upstream which has been in groovy and hirsute.
https://gitlab.freedesktop.org/hadess/iio-sensor-proxy/-/commit/eb8fde8fd246ea6c30a8d4a29d6061b42f7012f2
https://gitlab.freedesktop.org/hadess/iio-sensor-proxy/-/commit/de1e1ea35aea81a4b5c22cb2458e9686911fb383
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