Hi Jerome, > -----Original Message----- > From: Jérôme de Bretagne [mailto:jerome.debretagne@xxxxxxxxx] > Sent: Wednesday, June 7, 2017 6:06 PM > To: ACPI Devel Maling List <linux-acpi@xxxxxxxxxxxxxxx>; linux- > pm@xxxxxxxxxxxxxxx; Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> > Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>; Darren Hart > <dvhart@xxxxxxxxxxxxx>; Srinivas Pandruvada > <srinivas.pandruvada@xxxxxxxxxxxxxxx>; Mika Westerberg > <mika.westerberg@xxxxxxxxxxxxxxx>; Limonciello, Mario > <Mario_Limonciello@xxxxxxxx> > Subject: Re: [PATCH 0/3] ACPI / sleep: Support power button wakeup from S2I on > recent Dell laptops > > Hi, > > Here is some feedback for Dell Latitude 7275, as suggested by Srinivas > in https://bugzilla.kernel.org/show_bug.cgi?id=195897#c15 . > > For some context on that model, suspend-to-RAM is not safe as the > system hangs (raised in the above bug report). I'm wondering if this > is expected somehow, due to S3 not being supported on that model, as > discussed for the XPS 13 9365. Maybe Mario or someone else from Dell > would be able to confirm this point. > The Latitude 7275 was not a machine that was tested with Linux during development. This machine shipped with Windows 8, right? I believe this machine also supports Connected Standby (the precursor to Modern Standby that behaves very similarly). I have an ask out to someone who can confirm that. > While it's not set by default, suspend-to-idle works fine. However the > power button needs a very long press of about 6-7s to trigger the > wake-up (quite surprising at first). > > I've applied Rafael's patch series on 4.12-rc4, with the 3rd patch > modified to add the Latitude 7275 DMI values, to check if the proposed > fix for the XPS 13 9360 and 9365 could also work for this other quite > recent Dell model. > > Sadly with the latest BIOS 1.1.31, this patch set doesn't seem to > change anything: the long press is still needed. > > Surprisingly and more for reference I suppose, this patch set works as > intended with an older BIOS 1.1.20 : the system can then be woken up > from system-to-idle with a usual short press. Cf. > https://bugzilla.kernel.org/show_bug.cgi?id=195897#c9 for more details > about why I've downgraded to and tested that specific older BIOS. > > I'm wondering if there could be ways to modify slightly this patch > series to also cover the Latitude 7275 when running the current BIOS. > If I can provide any inputs that could be useful to investigate, > please let me know. > > Thanks, > Jérome ��.n��������+%������w��{.n�����{�����ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
