Notebook Hardware Control

[ajsimeon]

I get a blue screen when i try to set voltage of 8x multiplier to .780. I could get it to .796. Any clue to why it would do a blue screen if i go lower?

[ajsimeon]

also does anyone know if undervolting voids warranty if i ask them whats wrong when i undervolt?

[simms]

Because your computer can't run stable at such low voltages.

And no, does not void - just restart and you'll be fine.

[ajsimeon]

i could see it not responding by freezing the computer. however mine is doin blue screens when i press set. does it sometimes without it at least testing it out.

[nirvana0001]

try to set at higher voltage and test with prime95

[Cache]

I'm sorry if this has been answered somewhere else (I searched all over and couldn't find anything), but I read through the IBM warranty and am still confused as to where undervolting falls. I saw that above simms said it won't void it but is that just because it shouldn't do any damage/they wouldn't be able to tell or is it actually covered?

[FTC]

Hi,

When you undervolt, you are effectively running the processor out of specs, the same as if you overvolt. Difference is that you avoid the risk of burning it because you are giving it 'less' juice, so in any case it will not get as 'hot' as with the designed voltages.... but.. the transistors inside are likely to stop functioning correctly if you go too low... and the evidence of this is not always the same, freezes, blue screens, calculation errors, all of those can happen because not all the transistors fail at the *exact* same threshold voltage level.

In fact, it is also not only a processor-internal thing. Note that even if you set a given voltage level, there is a margin of error and a variability on the source associated with things such as cpu and other components load, ambient temp, whether you are running on batteries or AC, and some others, so a given unit may *look* like running OK at a given voltage and then suddently fail, because your battery voltage levels have decreased a bit, or because you're running a power-hungry program, or just because it's summer and hotter. This is why, also when you underclock, you should leave a good margin from the detected lower voltage level just to make sure you're stable.

[jhonyl]

Personaly, I think that you don't have any permenent damage due to undervolting. I also don't think that IBM can detect undervolting was done in their support lab, unless you keep the undervolting software on the hard disk ... If you don't manage to tune NHC don't use it, and at least you will run stable. Search my posts on the sticky thread to see how to tune NHC.

If I were you, I wouldn't tell IBM support anything about undervolting. I don't know the exact policy they have... but in general support people look for any excuse to not do their job, it might just be the excuse they need ...

I have seen here many post that support that view about support. I also seen many post about laptops that were sent to the support lab and new good parts of these laptops were replaced with bad refurbished parts for no reason. I suggest to you to try to figure out problems by yourself.