From 4deda9c24f1deb015946c709d1d3d11f1c0e2325 Mon Sep 17 00:00:00 2001
From: Duncan Laurie <dlaurie@chromium.org>
Date: Sat, 12 Mar 2011 15:45:19 -0800
Subject: [PATCH] Disable the 8042 MUX on our x86 devices.

The use of the mux can cause issues with some EC 8042 controllers and
result in loss of keyboard/trackpad between suspend/resume/reboot cycles.
We will never have more than keyboard+trackpad attached through the 8042
on our devices so using the mux is unnecessary.

BUG=chrome-os-partner:2700
TEST=manual verification that mux is not probed at boot:

Original:
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX0 port at 0x60,0x64 irq 12
serio: i8042 AUX1 port at 0x60,0x64 irq 12
serio: i8042 AUX2 port at 0x60,0x64 irq 12
serio: i8042 AUX3 port at 0x60,0x64 irq 12

New:
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12

Change-Id: I942ab86eb71941ab072ad6a17d15b067ca94439d

Review URL: http://codereview.chromium.org/6679031
---
 build_kernel_image.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/build_kernel_image.sh b/build_kernel_image.sh
index 5ee3e305a3..6f87ebe72b 100755
--- a/build_kernel_image.sh
+++ b/build_kernel_image.sh
@@ -168,6 +168,7 @@ kern_guid=%U
 tpm_tis.force=1
 tpm_tis.interrupts=0
 nmi_watchdog=panic,lapic
+i8042.nomux=1
 EOF
   WORK="${WORK} ${FLAGS_working_dir}/config.txt"