Re: [Bug 106031] Regression in 4.2.x: in airplane mode each time I open my laptop lid

[Darren Hart <dvhart@infradead.org>]

On Fri, Nov 20, 2015 at 03:44:25PM +0100, Pali Rohár wrote:
> On Friday 23 October 2015 20:03:19 Gabriele Mazzotta wrote:
> > On 23/10/2015 13:14, Pali Rohár wrote:
> > >On Friday 23 October 2015 11:47:25 Gabriele Mazzotta wrote:
> > >>>In my opinion it is better to ignore user key press after resume, if it
> > >>>fix our problem. Better as false-positive event.
> > >>
> > >>The following appears to work really well. The notification arrives
> > >>before rbtn_resume() has been executed, so the extra event is ignored.
> > >>
> > >>diff --git a/drivers/platform/x86/dell-rbtn.c
> > >>b/drivers/platform/x86/dell-rbtn.c
> > >>index cd410e3..1d64b72 100644
> > >>--- a/drivers/platform/x86/dell-rbtn.c
> > >>+++ b/drivers/platform/x86/dell-rbtn.c
> > >>@@ -28,6 +28,7 @@ struct rbtn_data {
> > >>  	enum rbtn_type type;
> > >>  	struct rfkill *rfkill;
> > >>  	struct input_dev *input_dev;
> > >>+	bool suspended;
> > >>  };
> > >>
> > >>
> > >>@@ -220,9 +221,33 @@ static const struct acpi_device_id rbtn_ids[] = {
> > >>  	{ "", 0 },
> > >>  };
> > >>
> > >>+#ifdef CONFIG_PM_SLEEP
> > >>+static int rbtn_suspend(struct device *dev)
> > >>+{
> > >>+	struct acpi_device *device = to_acpi_device(dev);
> > >>+	struct rbtn_data *rbtn_data = acpi_driver_data(device);
> > >>+
> > >>+	rbtn_data->suspended = true;
> > >>+
> > >>+	return 0;
> > >>+}
> > >>+
> > >>+static int rbtn_resume(struct device *dev)
> > >>+{
> > >>+	struct acpi_device *device = to_acpi_device(dev);
> > >>+	struct rbtn_data *rbtn_data = acpi_driver_data(device);
> > >>+
> > >>+	rbtn_data->suspended = false;
> > >>+
> > >>+	return 0;
> > >>+}
> > >>+#endif
> > >>+static SIMPLE_DEV_PM_OPS(rbtn_pm_ops, rbtn_suspend, rbtn_resume);
> > >>+
> > >>  static struct acpi_driver rbtn_driver = {
> > >>  	.name = "dell-rbtn",
> > >>  	.ids = rbtn_ids,
> > >>+	.drv.pm = &rbtn_pm_ops,
> > >>  	.ops = {
> > >>  		.add = rbtn_add,
> > >>  		.remove = rbtn_remove,
> > >>@@ -384,6 +409,9 @@ static void rbtn_notify(struct acpi_device *device, u32
> > >>event)
> > >>  {
> > >>  	struct rbtn_data *rbtn_data = device->driver_data;
> > >>
> > >>+	if (rbtn_data->suspended)
> > >>+		return;
> > >>+
> > >>  	if (event != 0x80) {
> > >>  		dev_info(&device->dev, "Received unknown event (0x%x)\n",
> > >>  			 event);
> > >>
> > >
> > >Great, but is not there a better way to turn off .notify ACPI function
> > >when that ACPI device is suspended?
> > >
> > >Is not this ACPI device driver bug that it allows to call .notify method
> > >even if device is suspended?
> > 
> > I was surprised this worked, I was assuming that nothing could run
> > before the resume callback, but I was wrong. I think it makes sense to
> > treat ACPI devices in a special way, but I really don't know, we need
> > someone more knowledgeable to answer these questions. However, while I
> > was trying to figure things out, I stumbled upon the following:
> > e71eeb2a6bcc ("ACPI / button: Do not propagate wakeup-from-suspend events").
> 
> Gabriele, are you going to send this patch?
> 
> I think that patch should be OK as it drop events when device is in
> suspend state (when it should not receive events)...
> 
> Darren, what do you think about it?
> 

Sorry, this one has been difficult for me to track, but it's clearly an issue,
and new systems are experiencing it as well.

I'd like to get Rafael's opinion on disabling .notify ACPI function while
suspended.

+Rafael

Has Dell been involved here?

+Jared


-- 
Darren Hart
Intel Open Source Technology Center