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22c11b8f1b
The Xiaomi Mi Pad 2 is currently listed under the: "Models which should use the vendor backlight interface, because of broken ACPI video backlight control." section. But this is not 100% correct. The Xiaomi Mi Pad 2 is one of a set of x86 tablets which shipped with Android as factory OS. These tablets have a TI LP8557 backlight controller with its PWM input _not_ connected to the PMIC or chipset (LPSS) PWM output. Instead the backlight can be controlled by configuring the LP8557 for direct control through its brightness I2C register and then using the lp855x driver. This setup means that neither i915's native or acpi_video backlight control works, so a "vendor" quirk is added for these tablets to disable both the native and acpi_video backlight devices, but these devices do not use vendor control in the typical meaning of vendor specific SMBIOS or ACPI calls being used. This patch is a preparation patch for adding "vendor" quirks for a couple more such tablet models. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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| README | ||
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.