Re: How can I deactivate the laptop-mode permanently?

[Ritesh Raj Sarraf]

Hello Igor,

I just am in the middle of setting up the new Laptop Mode Tools mailing
list. So I'm too tempted to test posting to that group.

So, I've added the new group into CC. Hope that is fine with you.


On Wed, 2016-01-20 at 13:05 +0100, Igor Schmidt wrote:
> 
> I readed that the laptop-mode can reduce the lifespan of hard drives
> and
> i assumed that it have a similar effect on SSDs.
>
> > Warning: Spinning down a hard drive too frequently can shorten its
> > lifespan. Take care when choosing a proper value.
>
> Does it have another effect on SSDs?
>

Thanks for pointing that. I'll have to update the documentation.

To answer you, no. The issue is specifically with Rotation Magnetic
Drives, where you want to spin down the drive, so that you can save
some power. But every spin down/up results in an increase in the Load
Cycle for such drives.

It is not a Laptop Mode Tools problem. But rather a rotational drive
problem.

> > Question: I have a solid-state disk (SSD) in my machine. Should I
> > enable any of the disk-related parts of laptop-mode-tools, or are
> > they irrelevant?
> >
> > Answer: They may be relevant, because (a) laptop mode will reduce
> > the number of writes, which improves the lifetime of an SSD, and
> > (b) laptop mode makes writes bursty, which enables power saving
> > mechanisms like ALPM to kick in. However, your mileage may vary
> > depending on the specific hardware involved. For some hardware, you
> > will get no gain at all, for some the gain may be substantial. 
>
> https://wiki.archlinux.org/index.php/Laptop_Mode_Tools
>
> Can the laptop-mode as was pointed out above improve the lifespan of
> the
> SSD, because it reduces the number of writes? Is it necessary to
> change
> the default settings for my system?
>

I cannot assure if it'll improve the life of the SSD, but for sure,
Laptop Mode Tools does not have negative impact.
 
>
> I set yesterday ENABLE_LAPTOP_MODE_TOOLS to zero in the lapop-
> mode.conf,
> but the command "cat /proc/sys/vm/laptop_mode" still shows "5".
>
> When i deactivate the laptop-mode with "sudo /usr/sbin/laptop-mode
> stop
> force", the answer is "laptop mode disabled, not active" AND "Error
> for
> wireless request. Set Power Management (8b2C): SET failed on device
> wlan; Operation no supported. Failed"
>
> Does this mean that the laptop-mode is complete disabled and the
> value
> "5" have another reason?
>

Yes. Probably some other tools is fiddling with them. Remember, those
are kernel knobs. Not something owned by Laptop Mode Tools.

--

Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."