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On some Dell XPS models WMI events of type 0x0000 reporting a keycode of 0xe00c get reported when the brightness of the LCD panel changes. This leads to us reporting false-positive kbd_led change events to userspace which in turn leads to the kbd backlight OSD showing when it should not. We already read the current keyboard backlight brightness value when reporting events because the led_classdev_notify_brightness_hw_changed API requires this. Compare this value to the last known value and filter out duplicate events, fixing this. Note the fixed issue is esp. a problem on XPS models with an ambient light sensor and automatic brightness adjustments turned on, this causes the kbd backlight OSD to show all the time there. BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1514969 Fixes: 9c656b0799 ("platform/x86: dell-*: Call new led hw_changed API ...") Acked-by: Pali Rohár <pali.rohar@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.