Hi All, On Thursday, June 01, 2017 01:23:43 AM Rafael J. Wysocki wrote: > > This is a follow-up for a patch series posted some time ago: > > http://marc.info/?l=linux-kernel&m=149324246701378&w=2 > > The first two patches from that series are in 4.12-rc already and the rest > have been rearranged. Here's a v2 of the above. The first two patches are actually the same as before, only with ACKs from Andy. The third patch is almost the same, but it adds a new command line switch to go back to the semi-functional power button wakeup from s2idle if someone really wants that. > The issue at hand is still the same as before: > > On Wednesday, April 26, 2017 11:21:11 PM Rafael J. Wysocki wrote: > > > > The underlying issue is that on some relatively new Dell laltops, including > > Dell XPS13 9360 and 9365, pressing the power button is not sufficient to > > wake up the system from suspend-to-idle (it has to be pressed and held > > down for around 5 sec for the wakeup to happen) which is not expected > > and does not match the Windows' behavior. > > > > This turns out to be a consequence of the way power button events are signaled > > on those systems, which is through the Embedded Controller (EC). Namely, > > button events go to the EC which then signals the event through its ACPI GPE > > (General Purpose Event), which triggers an ACPI SCI (System Control Interrupt), > > whose handler executes a specicif AML control method and triggers a Notify() > > targetting a devie object associated with the power button. The problem with > > suspend-to-idle is that the EC GPE is disabled during suspend, because > > otherwise all EC events would wake up the system from suspend-to-idle (and > > there can be many of them). > > The first two patches in the current series update the drivers used for button > events processing on the affected systems so that they signal wakeup as > expected and avoid propagating the wakeup events as button events to user > space. > > The third patch allows the EC GPE to become a wakeup GPE on the affected Dell > laptops and finally makes power button events wake up those systems from > suspend-to-idle. > > After this series there still is a concern regarding the possible increase of > power draw that may result from the processing of non-wakeup EC events while > suspended which is why the change only affects Dell XPS13 9360 and 9365 > for now. > > There is no code dependency between patches [1-2/3] and patch [3/3], but all > of them together are necessary for the feature in question to work on both the > affected systems, so IMO they should be applied together. The series is based on current linux-next. It is available from a git branch at git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git s2idle-dell-test and has been included into the testing branch thereof. If there are any concerns regarding this series, please let me know. Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
