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. 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 -- 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
