07-01-2010 04:38 PM
there is one way that can slightly improve performance with a 90W adapter. Well, sometimes...
take the power cord out (i.e. let it run on battery) and put it back in. the power management may reset itself.
to check you can look at the power consumption, in the lenovo power managment utility. when the consumption goes down in idle then i noticed that the performance improves. it doesn't solve video performance that is still very poor.
i wonder if there is a way to make lenovo address the issue. Maybe a lot of comments?
07-20-2010 03:16 PM
I also have this issue. I invested significantly in the ultraslim 90W adapter (which I used for travelling with my ThinkPad W500). Now I am forced to lug this massive power supply around with me with no real option but to put my ultraslim adapter in the drawer and forget about it. Surely there must be some way that the BIOS could be adjusted so that the user has the option to have the laptop run at maximum performance despite being powered by 90W power supply (after all it does so happily when it's running on its own batteries).
07-20-2010 04:42 PM
I agree and want a solution from Lenovo ....
Why do I get better (much better) performance on battery alone than when I have a 90W adapter plugged in.
That's just crazy.
07-22-2010 10:17 AM
Most Thinkpad design and bios implementation are done to maxmise stability of the system, there is usually a safety margin built into the power manager system to ensure that laptop would never shut itself off due to the lack of power from the adapter.
Also, there is usually a fraction of the power from the power adapter that is especially reserved for battery charging. Regarding taking power from the battery when the 90 watt adapter proves to be inadequate, this would complicate the firmware more than it is necessary.
I don't think Lenovo would provide a bios modification to accomodate the 90 watt adapter in W510, especially when it can cause problems for other users.
But the 135 watt adapter is slightly unwieldy for travelling, i guess lenovo should provide a more portable option, like a slim adapter that is capable of supplying 135 watt of power for those whom need to travel with the W510.
08-17-2010 06:28 PM
08-17-2010 08:38 PM
08-18-2010 06:13 AM
Yup -- after much testing, I am convinced the power manager / bios for the w510 is incapable of properly running off anything other than 135w power supplies. I have not had a good experience with anything less. Sometimes things are fine for an hour or two -- but undoubteldy I have to pull power and reset through the day to keep the system running at proper speeds.
01-10-2011 12:51 AM - last edited on 04-05-2011 07:29 AM by Maliha
sorry for my pool english...
just read this topic...
i also have this problem before, but only after a hardware modification this issue can be easily fixed...
!!!Modification at your own risk!!!
1) remove the keyboard, there is a 7 pin power connector nearby the cooling plate upper left.
the cable color from left to right are:
1blue 2red 3red 4red 5black 6black 7black
2) short the 1blue and 7black cable to disable PSU dectection.
warning, this modification i have only tested on my w510 (System model: 4391W3U), after this modification my w510 identifies all attached PSU as original 135W PSU, but i can't garantee this modification won't damage any hardware.
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