Public bug reported:
On Dell Venue 11 Pro 7140 average power consumption in idle increased by
1.3-1.5 times due to events coming from INT343A. According to powertop
since Linux 4.10 INT3432:00 generate around two hundred events on
average, in /sys/devices/pci0000:00/INT3432:00/i2c-6 there is two
devices: INT343A and SMO91D0. AFAIK INT343A is rt286.
With Linux 4.9.0-4.9.45, Linux 4.11.0-4.11.12 in idle there is around 100
wakeups per second in sum, battery discharge rate around 3-3.5 Watts per second.
But with Linux 4.9.46-4.9.51, Linux 4.10.0-4.10.17, Linux 4.12.0rc1-4.13.3 -
around 300 wakeups per second on average, due to events coming from INT3432:00.
With Linux 4.13.3 battery discharge rate around 4.5 Watts per second.
Probably some commit was backported to Linux 4.9 between .45 and .46 releases.
I have no idea why issue is not reproducible on any Linux 4.11 release I tried.
Sometimes INT3432 events rate fall from two hundred to one hundred for
shorts period of time (for example I observe this right now on Linux
4.10.0 while removing/installing packages).
Message like this sometimes appear in dmesg:
[ 731.226730] i2c_hid i2c-SMO91D0:00: i2c_hid_get_input: incomplete report
(53/13568)
Complete dmesg with Linux 4.13.3 is attached.
** Affects: linux
Importance: Unknown
Status: Unknown
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "dmesg"
https://bugs.launchpad.net/bugs/1719795/+attachment/4957514/+files/dmesg
** Bug watch added: Linux Kernel Bug Tracker #197047
https://bugzilla.kernel.org/show_bug.cgi?id=197047
** Also affects: linux via
https://bugzilla.kernel.org/show_bug.cgi?id=197047
Importance: Unknown
Status: Unknown
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https://bugs.launchpad.net/bugs/1719795
Title:
Dell 7140 avarage power consumption in idle increased by 1.3-1.5 times
due to events by INT3432
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