It looks like the C15B laptop got another vendor: ByteSpeed LLC.

Avoid AUX loopback on this touchpad as well, thus input subsystem will
be able to recognize a Synaptics touchpad in the AUX port.

BugLink: https://bugs.launchpad.net/bugs/1906128
Signed-off-by: Po-Hsu Lin <po-hsu....@canonical.com>
---
 drivers/input/serio/i8042-x86ia64io.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/input/serio/i8042-x86ia64io.h 
b/drivers/input/serio/i8042-x86ia64io.h
index a4c9b96..7ecb651 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -219,6 +219,10 @@ static const struct dmi_system_id __initconst 
i8042_dmi_noloop_table[] = {
                        DMI_MATCH(DMI_SYS_VENDOR, "PEGATRON CORPORATION"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "C15B"),
                },
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "ByteSpeed LLC"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "ByteSpeed Laptop C15B"),
+               },
        },
        { }
 };
-- 
2.7.4

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