Can you try this patch?

diff --git a/drivers/platform/x86/hp-wmi.c
b/drivers/platform/x86/hp-wmi.c
index 45cacf7..91cc5df 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -53,6 +53,7 @@
MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
 #define HPWMI_ALS_QUERY 0x3
 #define HPWMI_HARDWARE_QUERY 0x4
 #define HPWMI_WIRELESS_QUERY 0x5
+#define HPWMI_BIOS_QUERY 0x8
 #define HPWMI_HOTKEY_QUERY 0xc
 #define HPWMI_WIRELESS2_QUERY 0x1b
 
@@ -284,6 +285,18 @@ static int hp_wmi_tablet_state(void)
 	return (state & 0x4) ? 1 : 0;
 }
 
+static int hp_wmi_enable_hotkeys()
+{
+	int ret;
+	int query = 1;
+
+	ret = hp_wmi_perform_query(HPWMI_BIOS_QUERY, 1, &query, sizeof(query),
+				   0);
+	if (ret)
+		return -EINVAL;
+	return 0;
+}
+
 static int hp_wmi_set_block(void *data, bool blocked)
 {
 	enum hp_wmi_radio r = (enum hp_wmi_radio) data;
@@ -925,9 +938,7 @@ static int __init hp_wmi_init(void)
 		err = hp_wmi_input_setup();
 		if (err)
 			return err;
-		
-		//Enable magic for hotkeys that run on the SMBus
-		ec_write(0xe6,0x6e);
+		hp_wmi_enable_hotkeys();
 	}
 
 	if (bios_capable) {

-- 
Matthew Garrett | mjg59@srcf.ucam.org