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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2014-10-10 15:19:03 -0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2014-10-11 14:34:43 -0400
commit68da166491655bc54051bf04c78ce648e2e33508 (patch)
tree9e3a830d7782512b492011932ddd789d13a900c4 /drivers/input/serio/i8042.c
parent9ff84a17302aeb8913ff244ecc0d8f9d219fecb5 (diff)
Input: i8042 - disable active multiplexing by default
Active multiplexing is a nice feature as it allows several pointing devices (such as touchpad and external mouse) use their native protocols at the same time. Unfortunately many manufacturers do not implement the feature properly even though they advertise it. The problematic implementations are never fixed, since Windows by default does not use this mode, and move from one BIOS/model of laptop to another. When active multiplexing is broken turning it on usually results in touchpad, keyboard, or both unresponsive. With PS/2 usage on decline (most of PS/2 devices in use nowadays are internal laptop touchpads), I expect number of users who have laptops with working MUX implementation, docking stations with external PS/2 ports, and who are still using external PS/2 mice, to be rather small. Let's flip the default to be OFF and allow activating it through i8042.nomux=0 kernel option. We'll also keep DMI table where we can record known good models. Acked-by: Jiri Kosina <jkosina@suse.cz> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/serio/i8042.c')
-rw-r--r--drivers/input/serio/i8042.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index f5a98af3b325..9a97c2b10926 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -39,7 +39,7 @@ static bool i8042_noaux;
39module_param_named(noaux, i8042_noaux, bool, 0); 39module_param_named(noaux, i8042_noaux, bool, 0);
40MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port."); 40MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port.");
41 41
42static bool i8042_nomux; 42static bool i8042_nomux = true;
43module_param_named(nomux, i8042_nomux, bool, 0); 43module_param_named(nomux, i8042_nomux, bool, 0);
44MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing controller is present."); 44MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing controller is present.");
45 45