Here is the patch
commit c538b9436751a0be2e1246b48353bc23156bdbcc
Author: Mika Westerberg <mika.westerb...@linux.intel.com>
Date: Mon Oct 10 16:39:31 2016 +0300
pinctrl: intel: Only restore pins that are used by the driver
Dell XPS 13 (and maybe some others) uses a GPIO (CPU_GP_1) during suspend
to explicitly disable USB touchscreen interrupt. This is done to prevent
situation where the lid is closed the touchscreen is left functional.
The pinctrl driver (wrongly) assumes it owns all pins which are owned by
host and not locked down. It is perfectly fine for BIOS to use those pins
as it is also considered as host in this context.
What happens is that when the lid of Dell XPS 13 is closed, the BIOS
configures CPU_GP_1 low disabling the touchscreen interrupt. During resume
we restore all host owned pins to the known state which includes CPU_GP_1
and this overwrites what the BIOS has programmed there causing the
touchscreen to fail as no interrupts are reaching the CPU anymore.
Fix this by restoring only those pins we know are explicitly requested by
the kernel one way or other.
Cc: sta...@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=176361
Reported-by: AceLan Kao <acelan....@canonical.com>
Tested-by: AceLan Kao <acelan....@canonical.com>
Signed-off-by: Mika Westerberg <mika.westerb...@linux.intel.com>
Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
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https://bugs.launchpad.net/bugs/1632527
Title:
[Dell][XPS]Touchscreen fails to function after resume from s3 by Lid
close/open
Status in HWE Next:
In Progress
Status in linux package in Ubuntu:
In Progress
Bug description:
Touchscreen fails to function after resume from s3 by Lid close/open
Suspend from power menu/ power button cannot reproduce this issue
Steps:
1. Install ubuntu 16.04 and boot to OS
2. suspend the system by Lid close action
3. resume the session by Lid open
4. check if touchscreen function works
Expected results: Touchscreen should still works after Lid open
Actual results: Touchscreen fails to work after lid open
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https://bugs.launchpad.net/hwe-next/+bug/1632527/+subscriptions
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