Re: minidisplay-port on T440s working?

[ng0%n0.is@localhost]

ng0%n0.is@localhost transcribed 1.2K bytes:
> David Brownlee transcribed 2.5K bytes:
> > On Thu, 24 Jan 2019 at 15:10, <ng0%n0.is@localhost> wrote:
> > 
> > > Hi,
> > >
> > > while the VGA port on my T440s laptop is working, the
> > > minidisplay port is not working (at least with an
> > > amazonbasics Mini DisplayPort to HDMI cable.
> > >
> > > With not working I mean: VGA is recognized by xrandr,
> > > minidisplayport isn't.
> > >
> > > Any idea how I can debug this? Has anyone experienced
> > > the same issue?
> > >
> > > This is on NetBSD 8.0 GENERIC / amd64
> > >
> > 
> > I have a T530 (with the dual Intel/Nvidia video chipset) - I suspect it may
> > be a slightly different case, but just for reference:
> 
> Yeah, it is different - T440s only has an intel GPU chip.
> So I'm not sure if this can be compared? I always found dual GPU
> enough to avoid as long as I can. 

To clarify, my question was specifically about the T440s with IPS touchscreen
and if this is unsupported in GENERIC, where I could start debugging this.

> > When I boot with Intel enabled only the VGA port works (also tested with a
> > Thinkpad dock which has multiple DVI and other ports, and only the VGA port
> > works on that too).
> > 
> > When I boot with Nvidia enabled the DisplayPort works, but the display
> > shows video corruption and rapidly becomes instable.
> > 
> > Interestingly when I boot Windows with the BIOS locked to Intel only, VGA
> > is also the only port that works.
> > 
> > David
>