[ltp] Less responsive input (blind typing) when running off battery

Martin Steigerwald linux-thinkpad@linux-thinkpad.org
Wed, 7 Sep 2011 10:41:49 +0200

Am Mittwoch, 17. August 2011 schrieb John Magolske:
> I find that while running off battery & not plugged into AC there are
> frequent and regular "freezes" when typing. All of a sudden I'll find
> myself "blind-typing" for 3 seconds or before a backlog of characters
> bursts on the screen. I notice this in Vim...maybe other applications
> too but can't confirm it at the moment.
> I'm wondering if this might have something to do with the hard drive
> being in some power saving mode where it spins down more frequently
> while not plugged into AC power. Vim seems to write every single key
> press to disk as I type, so maybe the disk needs to spin up before
> something else can happen...just a guess. But I notice that even
> moving the text cursor around with the arrow keys is subject to this
> freezing behavior. Using the nice command like so:

I might have considered this too yesterday.

I wondered why sometimes the T520 wouldn=B4t react on user input and alread=
rebooted it, cause I thought it had crashed.

But sometimes it appeared just to be hanging, the KDE 4.6.5 desktop plasma=
shell, for example. And then it went on.

It was on battery at that time and I never had this on ac power supply.

But then my T520 has an Intel SSD 320. So I bet its not a spinning up/down=

That said I am not yet sure whether we really have the same issue. I have=20
seen this only once. But I didn=B4t have the ThinkPad on battery for a long=
time until yesterday.

I have Debian Sid with linux kernel 3.0.3.

Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7