[ltp] Re: T520: With or without NVIDIA-Graphic?

[Javier Santoyo]

Hi,
I have a T520 with NVIDIA optimus and after some searching I managed to 
get it working.
If you want to use the optimus NVIDIA configuration you can use bumblee 
(http://bumblebee-project.org/) . When running bumblee it will render 
through the NVIDIA card on the laptop screen fine. However I have not 
managed with bumblee  to use the display port or external VGA. To be 
able to use external VGA or display port I needed to use only the NVIDIA 
card (no as optimus). To do this you have to disable the optimus option 
in the BIOS by choosing "discrete" instead of "optimus". After this, 
your laptop will behave as if it only has an NVIDIA card and you can use 
nvidia settings to configure the card and save the configuration to 
xorg.conf. I'm running xubuntu 11.10 with "discrete" mode and I can get 
an external monitor also working when connected to the display port or 
to the external VGA.
Cheers,
Javier

On 30/03/12 17:00, Florian Reitmeir wrote:
> On 03/30/2012 12:36 PM, Axel Braun wrote:
>> Florian Reitmeir wrote:
>>
>>>> Lenovo is currently offering spring sales with some interesting 
>>>> rebates.
>>>> I'm looking for a T520, but not sure if to choose the one with
>>>> onboard-Intel or separate NVIDIA Graphic NVS 4200M.
>>>>
>>>> Most interesting is how both chips work with S2ram and S2disk - do 
>>>> they
>>>> wake up properly?
>>>
>>> intel is ok, for NVIDIA you have to be lucky. in worst case you can't
>>> use the nvidia card in the laptop because its switching between
>>> intel/nvidia and the kernel/x.org are not supporting those setups.
>>
>> Thanks for your quick answer :-)
>> Cant the card to be used be specified in the xorg.conf?
>
> no, because in my understanding, the nvidia card renders it picture 
> into the intel card-framebuffer, and the intel card is conntect to the 
> display.
>
> nvidia does not support this setup in the propritary drivers on linux.
>
> but .. maybe i'm wrong :-) the feature is called "nvidia optimus" 
> maybe found find more information for the laptop you desire.