[ltp] T410, DisplayPort and VGA outputs.

[Alex Deucher]

On Mon, Sep 9, 2013 at 8:21 PM, Mark Wotton <mwotton@gmail.com> wrote:
>
>
> On Mon, Sep 9, 2013 at 9:26 PM, Marius Gedminas <marius@gedmin.as> wrote:
>>
>> On Mon, Sep 02, 2013 at 08:09:05PM +1000, Mark Wotton wrote:
>> > I recently got an iPad 3 lcd and a controller from
>> > http://dp2retina.rozsnyo.com/ - works like a charm on my T410 over the
>> > displayport adapter. However, I can't seem to get VGA1, DP1, and LVDS1
>> > all
>> > going at the same time, though I can get any two of three by playing
>> > around
>> > with arandr. When I try, I get the result "xrandr: cannot find crtc for
>> > output DP1"
>> >
>> > (My T410 is one with the intel card, not nvidia.)
>> >
>> > xrandr --verbose follows - is what I'm attempting flat-out impossible,
>> > or
>> > am I missing some trick?
>>
>> AFAIK it's flat-out impossible.  The hardware has only two display
>> pipes, so you get to choose which two of the three output ports you want
>> to use.
>
>
> Righto, thanks Marius - I'll stop trying to boil the ocean then. (Would the
> same be true with a USB video adapter like the DisplayLink? Is it a
> different situation with the Nvidia hardware? I'm probably going to upgrade
> this machine before I go away anyway, so it'd be good to know what to get
> next. Been looking at the Asus UX301 - I'd miss the thinkpad keyboard and
> general build quality, but 2,560x1,440 resolution is hard to go past.)

Most modern radeon GPUs support between 4 and 6 independent displays.

Alex