With >=sys-kernel/gentoo-sources-3.15.1, usb devices, including usb mice and usb-capable mobile phones, lose consistent power supply on `Waiting for uevents to be processed'. Unplugging and then re-plugging the devices restores the persistent power supply. Reproducible: Always Steps to Reproduce: 1. Plug a mobile phone and an usb mouse to the machine. 2. Power on the machine. Actual Results: Charging indicator on the phone and the bottom laser light of the usb mouse, go off on `Waiting for uevents to be processed', indicating they lose the persistent power supply. Expected Results: The power supply is there all the time. I am using a laptop with app-laptop/laptop-mode-tools, so the problem might not necessarily on the kernel side.
Can you attach the output of "dmesg" from a boot where you see the problem?
Just now I found this issue was directly caused by upgrade of app-laptop/laptop-mode-tools from 1.64-r2 to 1.65. The upgrade of the two packages happened quite close to each other so I misintepreted the problem. I am very sorry about that, and will look into the problem today :(
The problem should be caused by `CONTROL_RUNTIME_AUTOSUSPEND' (newly introduced in laptop-mode-tools 1.65) set to 1 by default in `conf.d/runtime-pm.conf', and is not related to a kernel bug. Sorry for the inconvenience.