SRU request for LP#21558

[Colin Ian King]

https://bugs.launchpad.net/ubuntu/+bug/21558

SRU Justification
 
Impact: Regression for ThinkPad R31 (IBM 2656) with buggy embedded
controller/keyboard combo chip causing erratic pointer movement.

Fix description: Simple patch that blacklists IBM 2656 in serio/i8042

Originally blacklisted in 6.06, (see
https://lists.ubuntu.com/archives/kernel-team/2006-June/000916.html )
but omitted from Hardy.

diff --git a/drivers/input/serio/i8042-x86ia64io.h
b/drivers/input/serio/i8042-x86ia64io.h
index c5e68dc..bde78a9 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -270,6 +270,13 @@ static struct dmi_system_id __initdata
i8042_dmi_nomux_table[] = {
                        DMI_MATCH(DMI_PRODUCT_NAME, "M636/A737
platform"),
                },
        },
+       {
+               .ident = "IBM 2656",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "2656"),
+               },
+       },
        { }
 };