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dell-rbtn: Add a comment about the XPS 13 9350

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On the XPS 13 9350, the dell-rbtn mechanism has a new device id, and
the DSDT turns it off if a new enough _OSI is supported.  Add a
comment about why we don't bother supporting it.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
This commit is contained in:
Andy Lutomirski 2016-02-15 08:32:37 -08:00 committed by Darren Hart
parent a464afb958
commit 4d340c6b9c
1 changed files with 15 additions and 0 deletions
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15
drivers/platform/x86/dell-rbtn.c
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@ -217,6 +217,21 @@ static void rbtn_notify(struct acpi_device *device, u32 event);
static const struct acpi_device_id rbtn_ids[] = {
{ "DELRBTN", 0 },
{ "DELLABCE", 0 },
/*
* This driver can also handle the "DELLABC6" device that
* appears on the XPS 13 9350, but that device is disabled
* by the DSDT unless booted with acpi_osi="!Windows 2012"
* acpi_osi="!Windows 2013". Even if we boot that and bind
* the driver, we seem to have inconsistent behavior in
* which NetworkManager can get out of sync with the rfkill
* state.
*
* On the XPS 13 9350 and similar laptops, we're not supposed to
* use DELLABC6 at all. Instead, we handle the rfkill button
* via the intel-hid driver.
*/
{ "", 0 },
};