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    Subject[PATCH 5.6 085/177] Input: i8042 - add ThinkPad S230u to i8042 nomux list
    Date
    From: Kevin Locke <kevin@kevinlocke.name>

    [ Upstream commit 18931506465a762ffd3f4803d36a18d336a67da9 ]

    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>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/input/serio/i8042-x86ia64io.h | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
    index 08e919dbeb5d..5bbc9152731d 100644
    --- a/drivers/input/serio/i8042-x86ia64io.h
    +++ b/drivers/input/serio/i8042-x86ia64io.h
    @@ -541,6 +541,13 @@ static const struct dmi_system_id __initconst i8042_dmi_nomux_table[] = {
    DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
    },
    },
    + {
    + /* Lenovo ThinkPad Twist S230u */
    + .matches = {
    + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
    + DMI_MATCH(DMI_PRODUCT_NAME, "33474HU"),
    + },
    + },
    { }
    };

    --
    2.25.1


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