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Re: Multi-display - one monitor active but blank

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Oliver Elphick composed on 2016-03-21 22:56 (UTC):

> On Mon, 2016-03-21 at 17:27 -0400, Felix Miata wrote:

>> Oliver Elphick composed on 2016-03-21 21:01 (UTC):

>> > I have two monitors; the second one sometimes comes to life but is
>> > usually blank. However, the system thinks that it is active and
>> > displaying.

>> Which Debian?

> MATE testing

> # cat /etc/debian_version
> stretch/sid

> (up to date)

>> 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.

>> Maybe you hit a known bug, such as:
>> https://bugzilla.kernel.org/show_bug.cgi?id=94171

> It is not the same chipset as reported in that bug, and I don't know
> what I'm doing well enough to play with randr at the moment.

>> Show us Xorg.0.log and .xsession-errors and maybe we can help.

> .xsession-errors does not exist, so far as I can see. As far as the
> system is concerned, it doesn't think that there is any error.

> Xorg.0.log attached. Both monitors are recognised.

> Thanks for any suggestions.

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

2-if the cables are twins, boot the computer with the cables switched, so 
that the smaller is primary rather than the larger

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
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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Thread

Multi-display - one monitor active but blank Oliver Elphick <olly@lfix.co.uk> - 2016-03-21 22:10 +0100
  Re: Multi-display - one monitor active but blank Felix Miata <mrmazda@earthlink.net> - 2016-03-21 22:30 +0100
    Re: Multi-display - one monitor active but blank Mark Fletcher <mark27q1@gmail.com> - 2016-03-22 00:10 +0100
      Re: Multi-display - one monitor active but blank Oliver Elphick <olly@lfix.co.uk> - 2016-03-22 00:20 +0100
        Re: Multi-display - one monitor active but blank Lisi Reisz <lisi.reisz@gmail.com> - 2016-03-22 11:20 +0100
          Re: Multi-display - one monitor active but blank Ric Moore <wayward4now@gmail.com> - 2016-03-22 21:40 +0100
            Re: Multi-display - one monitor active but blank Oliver Elphick <olly@lfix.co.uk> - 2016-03-22 23:10 +0100
    Re: Multi-display - one monitor active but blank Felix Miata <mrmazda@earthlink.net> - 2016-03-22 02:00 +0100
      Re: Multi-display - one monitor active but blank Oliver Elphick <olly@lfix.co.uk> - 2016-03-22 10:50 +0100

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