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Re: two graphics cards and two monitors

Eric S Fraga composed on 2017-11-03 14:22 (UTC):

> I am trying to get a similar system configure with Debian testing/buster
> and not getting anywhere beyond having two monitors on a single card
> recognised. 

Is this a first try (has this ever worked before trying with Buster)?

> I have three monitors, two on first card and 1 on second
> card.  Only the ones of the first card are getting managed by
> Xorg.  Although the second card and associated monitor are found by
> Xorg, I cannot seem to get Xorg to configure and actually use this third
> monitor.

> Details follow:

> $ dpkg --list '*nouveau*'
> libdrm-nouveau2:amd64                2.4.84-2             
> xserver-xorg-video-nouveau           1:1.0.15-2           

> $ lspci | grep VGA
> 03:00.0 VGA compatible controller: NVIDIA Corporation GM107GL [Quadro K620] (rev a2)
> 04:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 210] (rev a2)

To be clear, both are PCIe cards, neither is onboard or integrated in the CPU

> $ uname -a
> Linux xxx 4.13.0-1-amd64 #1 SMP Debian 4.13.4-2 (2017-10-15) x86_64 GNU/Linux

> Selected lines from Xorg.0.log:

> [  3877.659] (--) NOUVEAU(0): Chipset: "NVIDIA NV117"
> [  3877.659] (II) NOUVEAU(0): Creating default Display subsection in Screen section
> [...]
> [  3877.693] (II) NOUVEAU(0): Output DVI-I-1 using monitor section rotated
> [...]
> [  3877.768] (II) NOUVEAU(0): Monitor name: DELL U2412M
> [...]
> [  3877.783] (II) NOUVEAU(0): Monitor name: DELL U3818DW
> [...]
> [  3877.783] (II) NOUVEAU(0): Output DVI-I-1 connected
> [  3877.783] (II) NOUVEAU(0): Output DP-1 connected
> [...]
> [  3877.783] (--) NOUVEAU(G0): Chipset: "NVIDIA NVA8"
> [...]
> [  3877.795] (II) NOUVEAU(G0): Output DVI-I-1-2 using monitor section rotated
> [  3877.851] (II) NOUVEAU(G0): Output HDMI-1-1 has no monitor section
> [  3877.862] (II) NOUVEAU(G0): Output VGA-1-1 has no monitor section
> [...]
> [  3878.010] (II) NOUVEAU(G0): Monitor name: SHARP HDMI

> but then nothing is connected to this monitor or this monitor is not
> connected to anything...  The strange thing is that the output says that
> output DVI-I-1-2 will use the "rotated" monitor section which has
> already been assigned to the DVI-I-1 output.

> I can post Xorg.0.log as well as my current xorg.conf if anybody is
> interested.  Without an xorg-conf at all, I get the same effective
> behaviour: two monitors working but third one ignored.

> Any suggestions welcome.

Things I would try:

1-Purge xserver-xorg-video-nouveau (IOW, does default modesetting driver find
three connected displays?).

2-Check if a Knoppix boot generates similar failure.

3-Swap the two cards between PCIe slots.

4-Can you get output on two displays if you remove the Quadro (IOW, will the
GeForce work at all)?

5-Try a DVI cable type with the GeForce/Sharp if the Sharp has a DVI port.

6-Try the GeForce with a DVI-to-HDMI adapter and HDMI cable.

7-Try a different HDMI port on the Sharp if it has more than one.

8-Report http://www.ucl.ac.uk/~ucecesf/tmp/xorglog.txt and failure on one of the
lists devoted to Xorg hardware issues, such as xorg-devel@lists.x.org or
"Wisdom is supreme; therefore get wisdom. Whatever else you
get, get wisdom." Proverbs 4:7 (New Living Translation)

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

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

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