[ltp] T520 Ubuntu 11.10 x64 - can't connect external monitor

Micha linux-thinkpad@linux-thinkpad.org
Sat, 04 Feb 2012 22:06:39 +0200


On 04/02/2012 16:01, Marius Gedminas wrote:
> On Fri, Feb 03, 2012 at 08:04:57PM -0500, Fen Labalme wrote:
>> Hi Marius,
>>
>> 2012/2/3 Marius Gedminas <marius@gedmin.as>
>>
>>> On Fri, Feb 03, 2012 at 02:27:59PM -0500, Fen Labalme wrote:
>>>> I have a new T520 that mostly works fine  I currently run nvidia (NVS
>>>> 4200M) discrete graphics, have compiz 3d effects and colors look good.
>>> ...
>>>> If I can't get this to work, I'm going to have to RMA my shiny new box :(
>>>
>>> (If you end up doing that, get a machine with Intel graphics -- VGA hotplug
>>> will just work.  DisplayPort... hm, no idea, don't have any of that.
>>> Likely not yet.)
>>
>> This machine has Intel integrated graphics.
> 
> It has both, which complicates things. Perhaps if you disabled the
> NVidia card in the BIOS, something would work?  I'm only guessing; I
> don't have any machines more modern than a T61.
> 
> It's also a question of how the outputs are connected to the graphics
> adapters; e.g. it's possible that DisplayPort is only driven by the
> NVidia chip.
> 
>> Tried that first, and after it
>> didn't work immediately I went searching for the nvidia driver.  But I'll
>> go back to Intel and see what I can find.  Will the VGA be able to drive a
>> 1920x1200 display?
> 
> Why not?  My Asus EeePC 900 (ancient Intel 945) drives a 1920x1080p TV
> over VGA with sufficient 3D for all those Compiz effects.
> 
> Digital video would be much nicer, though.  The pixels would align, and
> you would avoid analog noise.
> 
> Marius Gedminas

I have a w520, which is related. Don't know how the t520 is setup, but
if it has optimus it may be the same. With mine the external connectors
are connected to the NVIDIA, while when running with optimus enabled the
internal screen is connected to the intel. To get the external
connectors running, try to change the setting in the bios to discrete
graphics. I also don't know if nouvou can actually run the external
connectors or whether you'll need to install the proprietary NVIDIA drivers.