linux-kernel - [PATCH v3 0/3] Support for ASUS egpu, dpgu disable, panel overdrive

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Date:   Sat,  7 Aug 2021 14:36:53 +1200
From:   "Luke D. Jones" <luke@...nes.dev>
To:     linux-kernel@...r.kernel.org
Cc:     hdegoede@...hat.com, mgross@...ux.intel.com, pobrn@...tonmail.com,
        corentin.chary@...il.com, "Luke D. Jones" <luke@...nes.dev>
Subject: [PATCH v3 0/3] Support for ASUS egpu, dpgu disable, panel overdrive

This patch series adds support for some functions that are found on newer
ASUS gaming laptops:

- Panel overdrive: Some laptops can drive the LCD matrix slightly faster
  to eliminate or reduce ghosting artifacts

- dGPU disable: ASUS added a function in ACPI to disable or enable the dGPU
  which removes it from the PCI bus. Presumably this was to help prevent
  Windows apps from using the dGPU when the user didn't want them to but
  because of how it works it also means that when rebooted to Linux the dGPU
  no-longer exits. This patch enables a user to echo 0/1 to a WMI path to
  re-enable it (or disable, but the drivers *must* be unloaded first).

- eGPU enable: The ASUS x-flow lpatop has an iGPU, a dGPU, and an optional
  eGPU. This patch enables the user to echo 0/1 to a WMI path to enable or
  disable the eGPU. In ACPI this also appears to remove the dGPU from the
  PCI bus.

All of the above patches have been tested over the course of a few months.
There is a small possibility of user error perhaps, where the user tries to
enable or disable the dGPU/eGPU while drivers are loaded which would cause
a system hang, but it is expected that almost all users would be using the
`asusctl` daemon and dbus methods to manage the above which then eliminates
these issues.

Luke D. Jones (3):
  asus-wmi: Add panel overdrive functionality
  asus-wmi: Add dgpu disable method
  asus-wmi: Add egpu enable method

 drivers/platform/x86/asus-wmi.c            | 289 +++++++++++++++++++++
 include/linux/platform_data/x86/asus-wmi.h |   7 +
 2 files changed, 296 insertions(+)

--
2.31.1