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[ Upstream commit 37ef4c19b4c659926ce65a7ac709ceaefb211c40 ] Buttonpads are expected to map the INPUT_PROP_BUTTONPAD property bit and the BTN_LEFT key bit. As explained in the specification, where a device has a button type value of 0 (click-pad) or 1 (pressure-pad) there should not be discrete buttons: https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/touchpad-windows-precision-touchpad-collection#device-capabilities-feature-report However, some drivers map the BTN_RIGHT and/or BTN_MIDDLE key bits even though the device is a buttonpad and therefore does not have those buttons. This behavior has forced userspace applications like libinput to implement different workarounds and quirks to detect buttonpads and offer to the user the right set of features and configuration options. For more information: https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/726 In order to avoid this issue clear the BTN_RIGHT and BTN_MIDDLE key bits when the input device is register if the INPUT_PROP_BUTTONPAD property bit is set. Notice that this change will not affect udev because it does not check for buttons. See systemd/src/udev/udev-builtin-input_id.c. List of known affected hardware: - Chuwi AeroBook Plus - Chuwi Gemibook - Framework Laptop - GPD Win Max - Huawei MateBook 2020 - Prestigio Smartbook 141 C2 - Purism Librem 14v1 - StarLite Mk II - AMI firmware - StarLite Mk II - Coreboot firmware - StarLite Mk III - AMI firmware - StarLite Mk III - Coreboot firmware - StarLabTop Mk IV - AMI firmware - StarLabTop Mk IV - Coreboot firmware - StarBook Mk V Acked-by: Peter Hutterer <peter.hutterer@who-t.net> Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Acked-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: José Expósito <jose.exposito89@gmail.com> Link: https://lore.kernel.org/r/20220208174806.17183-1-jose.exposito89@gmail.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.