linux-kernel - Re: Modern Suspend on Dell Latitude 5285 does not resume

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Date:   Thu, 20 Jul 2017 23:03:55 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Nico Schottelius <nico.schottelius@...leich.ch>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Limonciello Mario <Mario_Limonciello@...l.com>,
        Tom Lanyon <tom@...shoeco.com>,
        Jérôme de Bretagne 
        <jerome.debretagne@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Zheng Lv <lv.zheng@...el.com>
Subject: Re: Modern Suspend on Dell Latitude 5285 does not resume

On Thu, Jul 20, 2017 at 8:24 PM, Nico Schottelius
<nico.schottelius@...leich.ch> wrote:
>
> Hello,
>
> following up the recent patch [0] to enable modern suspend on Dell notebooks, I
> can report that this patch does *not* fix the situation on Dell Latitude
> 5285. I have tested with v4.12-10845-g74cbd96 and when closing the "lid"
> or triggering sleep by echo mem > /sys/power/state, the system suspends,
> but never wakes up again. Trying to resume with the power button does
> not have any affect, as it is the case with 4.12.1.
>
> A long power button press to forcefully shutdown the system is
> necessary, at which point the notebook responds with blinking
> the power LED (3x red, 5x white), which seems not to be defined in
> the user manual.
>
> Is there anything I can do to test what is going on?

Have you tried "echo freeze > /sys/power/state" instead of "mem"?

Thanks,
Rafael