These settings directly go to firmware and this part of code is not touched from a long time. Did you update BIOS recently? Try to revert commits 6f92253024d9d947a4f454654840ce479e251376 and f1664eaacec31035450132c46ed2915fd2b2049a.
They should have been backported older kernels too. If this fixes this issue, means that sensors were not powered up in your other builds as user space program iio-sensor-proxy has a race condition and failed to power up sensors. I think you are able to reproduce the condition even during cold boot not just reboots. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 Status in Linux: Invalid Status in linux package in Ubuntu: New Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1719795/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
