On Sat, 2015-06-27 at 08:29 +0200, Jiri Kosina wrote: > On Fri, 26 Jun 2015, Greg Kroah-Hartman wrote: > Last time we were testing this, autosuspend for USB HID devices was quite > a disaster. > > Do you have any idea whether udev developers tested the "autosuspend on by > default for USB HID devices" on reasonable set of devices? > > The culrpits that I remember from top of my head (it's been long time > ago): > > - the LEDs for suspended device go off. This is very confusing at least on > keyboards, and brings really bad user experience That is a bug. hidinput_count_leds() is supposed to prevent that. What did you test? > - many keyboards were losing first keystroke when waking up from suspend. > We've been debugging this with Alan, and never root-caused it to a > problem in our code, it seems to be the property of the HW - mice don't wake up from movement alone. And again I would state that we don't get enough information from user space. Hardware seems to be designed for sleeping while a screen saver is on. In kernel space we just get a binary input desired or not desired from open/close. That is insufficient. Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
