Can't fstrim on /sdcard
As some of you you may know, some Android manufactures gift their mobile devices with slow memory chips, and I assume the 4X contain one of these, sometimes the lag gets me extremely frustrated.
Now, the application LagFix may be a solution, but as I didn't feel a noticeable difference, and I doubt that it may be because it does not work on /sdcard, only trims /cache, /data and /system.
So I am trying to do it myself from terminal, yet doing 'fstrim -v /sdcard' returns 1, which according to fstrim manuals indicates a failure.
So my question is, does the hope that additionally trimming /sdcard would enhance the situation, seem like a logical one ? If so, can you help me investigate the reason for failure ? trimming /data, for example, successes.