On Tue, 2017-06-27 at 17:03 +0200, Rafael J. Wysocki wrote: > On Tuesday, June 27, 2017 03:50:33 PM Tom Lanyon wrote: > > > > On 23 June 2017 at 12:40, Linus Torvalds <torvalds@linux-foundation > > .org> wrote: > > > > > > On Thu, Jun 22, 2017 at 4:56 PM, Rafael J. Wysocki <rjw@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. Also make sure that you have no FW loading error for i915. #dmesg | grep i915 It will display that Guc FW was loaded etc.. The latest FW can be downloaded from https://01.org/linuxgraphics/downloads/firmware
If you don't see PC10 residency, we can try something more. Thanks, Srinivas > > Thanks, > Rafael >
