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5d1023f33c
commit df03e9bd6d4806619b4cdc91a3d7695818a8e2b7 upstream. AES hardware may internally re-classify a contact that it thought was intentional as a palm. Intentional contacts are reported as "down" with the confidence bit set. When this re-classification occurs, however, the state transitions to "up" with the confidence bit cleared. This kind of transition appears to be legal according to Microsoft docs, but we do not handle it correctly. Because the confidence bit is clear, we don't call `wacom_wac_finger_slot` and update userspace. This causes hung touches that confuse userspace and interfere with pen arbitration. This commit adds a special case to ignore the confidence flag if a contact is reported as removed. This ensures we do not leave a hung touch if one of these re-classification events occured. Ideally we'd have some way to also let userspace know that the touch has been re-classified as a palm and needs to be canceled, but that's not possible right now :) Link: https://github.com/linuxwacom/input-wacom/issues/288 Fixes: 7fb0413baa7f (HID: wacom: Use "Confidence" flag to prevent reporting invalid contacts) CC: stable@vger.kernel.org Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com> Reviewed-by: Ping Cheng <ping.cheng@wacom.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.