2 files changed, 7 insertions, 1 deletions

diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index e2ddcdeb61b6..ab4b58eaa7f4 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -240,9 +240,13 @@ sysfs notes:
                 Returns 0.
 
         hotkey_bios_mask:
+                DEPRECATED, DON'T USE, WILL BE REMOVED IN THE FUTURE.
+
                 Returns the hot keys mask when thinkpad-acpi was loaded.
                 Upon module unload, the hot keys mask will be restored
-                to this value.
+                to this value.   This is always 0x80c, because those are
+                the hotkeys that were supported by ancient firmware
+                without mask support.
 
         hotkey_enable:
                 DEPRECATED, WILL BE REMOVED SOON.
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 679a73b43191..6b667891fc3b 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -2544,6 +2544,8 @@ static ssize_t hotkey_bios_mask_show(struct device *dev,
                            struct device_attribute *attr,
                            char *buf)
 {
+        printk_deprecated_attribute("hotkey_bios_mask",
+                        "This attribute is useless.");
         return snprintf(buf, PAGE_SIZE, "0x%08x\n", hotkey_orig_mask);
 }