for Linux 4.9.3 normal boot 7: 4945 1476 1820 275 IR-IO-APIC 7-fasteoi INT3432:00, INT3433:00
for Linux 4.9.3 boot after Linux 4.17.0 7: 327339 48015 802942 21344 IR-IO-APIC 7-fasteoi INT3432:00, INT3433:00 yes. there is indeed an interrupt storm, and this could increase the power consumption easily. It is very likely that the I2C bus is not powered off cleanly during reboot. so, when you say normal boot, you mean a cold boot, say, in 4.17.0 kernel, shutdown the machine, and then power on the machine manually to boot into 4.9.3 kernel, right? If this is true, we are still able to confirm the good and bad kernel, by do cold boot every time, right? As this seems to be a driver issue, reassign to I2C experts anyway. -- 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: Incomplete 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
