On Tuesday, June 27, 2017 03:50:33 PM Tom Lanyon wrote: > On 23 June 2017 at 12:40, Linus Torvalds <torva...@linux-foundation.org> > wrote: > > On Thu, Jun 22, 2017 at 4:56 PM, Rafael J. Wysocki <r...@rjwysocki.net> > > wrote: > >> > >> Some recent Dell laptops, including the XPS13 model numbers 9360 and > >> 9365, cannot be woken up from suspend-to-idle by pressing the power > >> button which is unexpected and makes that feature less usable on > >> those systems. [ details removed ] > > > > This looks much more reasonable and more likely to work on future machines > > too. > > > > Of course, who knows what broken machines it will cause problems on, > > but it sounds like the code now does what it's supposed to and what > > Win10 does, so maybe it JustWorks(tm). Hah. > > Rafael - thanks for your efforts on this.
You're welcome! > I wanted to provide some feedback from some quick and naive tests on > an XPS 13 9365 in case it was useful, as it seems like there's still > some way to go before matching Win10's behaviour. > > Linux idling w/ screen ON => 17% battery drain per hour. > Linux idling w/ screen OFF => 12% battery drain per hour. > Linux during s2idle => 6% battery drain per hour. > Win10 during sleep => 1% battery drain per hour. > > where Linux = 4.12-rc6 + the latest patch from your acpi-pm-test branch. > > So whilst s2idle halves the battery drain compared to the machine > staying powered on, it's still significantly more draining than Win10. Thanks for the data. > Let me know if there's any more useful analysis I can do. I would carry out s2idle under turbostat to see how much PC10 residency is there while suspended. That may be a significant factor. Most likely there is a device preventing the SoC from reaching its deepest low-power states under Linux on your system and it needs to be identified and dealt with. Thanks, Rafael
