** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: linux (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1863732
Title:
[bionic] hts221 sensor stops working after resume from S3/S4
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
Confirmed
Bug description:
[SRU Justification]
[Impact]
Dell Edge 300x IoT Gateways have a relative humidity sensor hts221.
The sensor stops working (and reports stale values) after the system
resumes from suspend-to-ram/suspend-to-disk PM states.
== Fix ==
AV_CONF register (RH & TEMP. oversampling ratio's) and CTRL1 register (ODR &
BDU settings) values are lost after suspend.
While the change in AV_CONF updates the sensor resolution modes
(overriding the user configuration before the device went to suspend);
loss of the contents of the CTRL1 register leads to failure in reading
sensor
This patch restores the AV_CONF & CTRL1 registers after
Already submitted upstream for both 4.17.y and 4.14.y (LTS) for review:
4.17.y: https://marc.info/?t=152455871600007&r=1&w=2
4.14.y: https://marc.info/?t=152506242000001&r=1&w=2
However, the issue is only affecting the Dell GW and not ST micro
devel. boards.
== Risk of Regression ==
Low.Tthe bug affects only the Dell GW and the patch is being carried in
linux-oem (4.15.y) since last 2 years without any regression.
linux-oem buglink: https://bugs.launchpad.net/bugs/1769658
This bug is for tracking purposes only, please don't triage.
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