Improved HD APM settings for laptop-mode

Prevented immediate spin-down after access on some laptop drives.

src/etc/laptop-mode/laptop-mode.conf

@@ -68,11 +68,14 @@ LM_AC_HD_IDLE_TIMEOUT_SECONDS=300
 LM_BATT_HD_IDLE_TIMEOUT_SECONDS=120
 NOLM_HD_IDLE_TIMEOUT_SECONDS=7200
 
-# HD power management (hdparm -B: aggressive=1..127, normal=128..254 (no spin-down), disable=255)
+# HD power management (hdparm -B: aggressive=1..127, normal=128..254
+#                                 (no spin-down without -S), disable=255)
+# NOTE: many laptop drives support only values 1, 128, 254, 255,
+#       with 1 resulting in immediate spindown after each access
 # ("auto" refers to ENABLE_AUTO_MODULES)
 CONTROL_HD_POWERMGMT="auto"
-BATT_HD_POWERMGMT=1
-LM_AC_HD_POWERMGMT=127
+BATT_HD_POWERMGMT=128
+LM_AC_HD_POWERMGMT=128
 NOLM_AC_HD_POWERMGMT=254
 
 # HD write cache management (hdparm -W)