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On the Lenovo ThinkPad Twist S230u (3347-4HU) with BIOS version "GDETC1WW (1.81 ) 06/27/2019", whether booted in UEFI or Legacy/CSM mode the keyboard, Synaptics TouchPad, and TrackPoint either do not function or stop functioning a few minutes after boot. This problem has been noted before, perhaps only occurring on BIOS 1.57 and later.[1][2][3][4][5] This model does not have an external PS/2 port, so mux does not appear to be useful. Odds of a BIOS fix appear to be low: 1.57 was released over 6 years ago and although the [BIOS changelog] notes "Fixed an issue of UEFI touchpad/trackpoint/keyboard/touchscreen" in 1.58, it appears to be insufficient. Adding 33474HU to the nomux list avoids the issue on my system. [1]: https://bugs.launchpad.net/bugs/1210748 [2]: https://bbs.archlinux.org/viewtopic.php?pid=1360425 [3]: https://forums.linuxmint.com/viewtopic.php?f=46&t=41200 [4]: https://forums.linuxmint.com/viewtopic.php?f=49&t=157115 [5]: https://forums.lenovo.com/topic/findpost/27/1337119 [BIOS changelog]: https://download.lenovo.com/pccbbs/mobiles/gduj33uc.txt Signed-off-by: Kevin Locke <kevin@kevinlocke.name> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/feb8a8339a67025dab3850e6377eb6f3a0e782ba.1587400635.git.kevin@kevinlocke.name Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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.