[ltp] Re: WARNING: Lenovo ThinkPads and 65W power supplies

[Karsten König]

Am Samstag, 6. November 2010, 15:39:37 schrieb Pedro Ribeiro:
> 2010/11/6 Csillag Tamas <cstamas@digitus.itk.ppke.hu>:
> > On Fri, Nov 05, 2010 at 01:42:45PM -0700, Mario Theodoridis wrote:
> >> On Friday, 5. 11 2010 07:18:15 Ben Pfaff wrote:
> >> > Laurent <pumpkin@gmx.de> writes:
> >> > >> This is a warning to owners of any Lenovo ThinkPads that own 65W AC
> >> > >> power adaptors.
> >> > > 
> >> > > Some new intel-GPU thinkpads come with a 65W PSU by default. Are you
> >> > > sure the problems (lower max. frequency w/o batt) applies to them
> >> > > as well?
> >> > 
> >> > My X201 is labeled 20V, 3.25V - 4.5V.  Multiplying, that's 65W - 90W .
> >> > It came with only a 65W power supply.  If it can really consume 90W,
> >> > then the 65W power supply is inadequate for that.
> >> 
> >> The 90W supply that came with my W500 claims 20V 4.5A
> > 
> > It is the same for T500. It is also clearly labelled as 90W on the
> > first line.
> > 
> > Regards,
> >  cstamas
> > --
> > CSILLAG Tamas (cstamas) - http://digitus.itk.ppke.hu/~cstamas
> > 
> > --
> > The linux-thinkpad mailing list home page is at:
> > http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
> 
> My T400 (P8400 and intel GPU) came with a 65W power adapter.
> 
> It never draws more than 45W in full load. But I guess if I'm charging
> the battery and working at full load it can probably go over 65W.
> 
> Thanks for the warning. The only problem with this is that 90W power
> supplies seem to be unrealiable...
> 
> Regards,
> Pedro

My T400 with dual graphics comes with a 90W PSU, a friends R400 with Intel 
graphics with a 65W PSU so I guess in the more recent Thinkpads it boils down 
to the graphic adapter (the Radeon can draw alot of power under load)

Still I wonder what would be the worst case scenario? A freezing laptop right? 
And maybe damaging the PSU but that should be covered by a fuse anyway.


Regards,
Karsten