Some new Thinkpad has a mute button with led. This mute led can out-of-sync
with mute in user interface. This kernel parameter disables the hardware
mute and led to avoid confusion. The hotkey will only issue scancode to UI.
Signed-off-by: Alex Hung <alex.hung@xxxxxxxxxxxxx>
---
drivers/platform/x86/thinkpad_acpi.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 03ca6c1..adb3a4e 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -253,6 +253,9 @@ enum tpacpi_hkey_event_t {
#define strlencmp(a, b) (strncmp((a), (b), strlen(b)))
+static bool use_hardware_mute = 1;
+module_param(use_hardware_mute, bool, 0644);
+
/****************************************************************************
* Driver-wide structs and misc. variables
*/
@@ -3327,6 +3330,17 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
if (res)
goto err_exit;
+ if (!use_hardware_mute) {
+ acpi_handle temp;
+
+ if (!ACPI_SUCCESS(acpi_get_handle(hkey_handle, "SHDA", &temp)))
+ pr_info("hardware mute interface is not supported\n");
+ else {
+ if (!acpi_evalf(hkey_handle, &status, "SHDA", "dd", 1))
+ pr_info("failed to disable hardware mute\n");
+ }
+ }
+
/* Set up key map */
hotkey_keycode_map = kmalloc(TPACPI_HOTKEY_MAP_SIZE,
GFP_KERNEL);
--
1.8.1.2
------------------------------------------------------------------------------
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