Comment 6 for bug 1906128

Hello Tom,
your finding looks promising, I have built two kernels base on that: Bionic 4.15 and Focal 5.4
Could you give them a test to see if this can solve your problem? (Don't forget to remove the i8042.noloop=1 option.)
https://people.canonical.com/~phlin/kernel/lp-1906128-C15B/
Thanks!

Changes for Bionic:
$ git diff
diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index 51bd2ebaa342..adb8b23a6393 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -223,6 +223,10 @@ 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"),
+ },
        },
        { }
 };

Changes for Focal:
$ git diff
diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index 98f0c7729b75..837911a15e44 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"),
+ },
        },
        { }
 };