This message may be useful to others having my similar problem.
On a Thinkpad X220, after having booted the custom kernel, running

[root@machine]# cat /sys/class/scsi_host/host0/link_power_management_policy

I get

max_performance

instead of

med_power_with_dipm


Here some machine details

[root@machine]# cat /etc/rc.d/rc.local
#!/bin/sh

for i in /sys/class/scsi_host/host*/link_power_management_policy; do
    echo med_power_with_dipm > $i
done


[root@machine]# ls -latr /etc/rc.d/rc.local
-rwxrwxr-x. 1 user user 119 13 set 14.53 /etc/rc.d/rc.local


[root@machine]# cat /proc/cpuinfo | grep "model name"
model name      : Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz
model name      : Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz
model name      : Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz
model name      : Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz


[root@machine]# cat /sys/class/scsi_device/*/device/model
Samsung SSD 850
(it is a Samsung 850 PRO)
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