ACPI / button: Add quirks for initial lid state notification

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Linux userspace (systemd-logind) keeps on rechecking lid state when the
lid state is closed. If it failed to update the lid state to open after
boot/resume, the system suspending right after the boot/resume could be
resulted.

Graphics drivers also use the lid notifications to implment
MODESET_ON_LID_OPEN option.

Before the situation is improved from the userspace and from the graphics
driver, users can simply configure ACPI button driver to send initial
"open" lid state using button.lid_init_state=open to avoid such kind of
issues.

And our ultimate target should be making button.lid_init_state=ignore
the default behavior.  This patch implements the 2 options and keep the
old behavior (button.lid_init_state=method).

Link: https://lkml.org/2016/3/7/460
Link: https://github.com/systemd/systemd/issues/2087
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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Lv Zheng 2016-06-01 18:10:48 +08:00 • committed by Rafael J. Wysocki

parent ee7e22653f

commit 3540c32a9a

1 changed files with 61 additions and 0 deletions

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drivers/acpi/button.c

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