Re: Multi-display - one monitor active but blank
On Mon, 2016-03-21 at 20:55 -0400, Felix Miata wrote:
> Oliver Elphick composed on 2016-03-21 22:56 (UTC):
> > > What gfxchip powers your displays?
> >
> > Card: Nvidia
> > 01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [NVS
> > 300]
> > (rev a2)
> >
> > (I hope that is an answer!)
> According to the log, you have both NVidia and Intel gfx hardware,
> which to
> me means you're probably using a laptop, making my help available to
> you very
> limited. AFAIK, those two together are a special hybrid that for
> optimal use
> requires a special driver, either Bumblebee, or Prime, depending on
> whether
> you want a FOSS solution (latter), or a proprietary one (former).
>
> Is it actually a PC with a separate NVidia card in a PCIe slot? If
> yes, are
> the cables actually both DisplayPort cables? Sometimes the logs
> identify
> connections differently from the actual physics. I've often seen
> physical DVI
> connectors identified as HDMI with Intel gfx hardware.
>
The latter is the case. The dual-head Nvidia card has both monitors;
the Intel port on the motherboard is not in use.
...
> First, ensure the display itself is not a problem by trying two
> things if you
> haven't already:
>
> 1-boot the computer with the 1920x1200 display powered off
The second (problem) display came up for the boot messages, but X still
treated the powered-off display as the primary display, so I had to
turn it on to log in. However the secondary display is currently
active, which is an improvement!
>
> 2-if the cables are twins, boot the computer with the cables
> switched, so
> that the smaller is primary rather than the larger
Bizarre results - the swapped primary (now secondary) was clearly using
the wrong driver settings, giving a very unclear picture, but both
screens came up.
On restoring things and rebooting, both screens came up. I'll wait to
see what happens when it blanks the screen after inactivity.
> Docs for solving such problems as yours are usually very good on
> Arch, so you
> might wish to look at https://wiki.archlinux.org/index.php/PRIME if
> nothing
> yet tried helps. Another place to look for video-focused help is:
> https://lists.x.org/mailman/listinfo/xorg
Thanks for the suggestions.
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