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637088a21e
At least the Bay Trail LPSS PWM controller used with DSI panels on many Bay Trail tablets seems to leave the PWM pin in whatever state it was (high or low) ATM that the PWM gets disabled. Combined with some panels not having a separate backlight-enable pin this leads to the backlight sometimes staying on while it should not (when the pin was high during PWM-disabling). First calling intel_backlight_set_pwm_level() will ensure that the pin is always low (or high for inverted brightness panels) since the passed in duty-cycle is 0% (or 100%) when the PWM gets disabled fixing the backlight sometimes staying on. With the exception of ext_pwm_disable_backlight() all other foo_disable_backlight() functions call intel_backlight_set_pwm_level() already before disabling the backlight, so this change also aligns ext_pwm_disable_backlight() with all the other disable() functions. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211121110032.4720-2-hdegoede@redhat.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.