Re: monitor setting in gnome using new randr 1.5 option

On 18 November 2015 at 10:09, Stephen Adler <adler stephenadler com> wrote:
On 11/11/2015 02:48 PM, drago01 wrote:

On Wed, Nov 11, 2015 at 8:22 PM, Stephen Adler <adler stephenadler com>


On 11/11/2015 10:34 AM, Bastien Nocera wrote:


On Wed, 2015-11-11 at 09:50 -0500, Stephen Adler wrote:


I have 3 MST type 4K monitor hooked up to my PC and I've been trying
get linux to work properly and have been chopping at the bit for
1.5 to come out which is supposed to solve the MST tile issue which
monitors suffer from.

Is there something I have to do, configure some file in /etc/
which would define which tiles make up a monitor? I'm not sure if
is something I have to do, or if gnome is supposed to take care of
tiling for me, by somehow defining which tiles are part of which

to make matters worse, I have a pair of nvidia cards for which the
nvidia driver does not support xorg 1.18, so I had to downgrade to
1.17. In doing so, I still have randr 1.5 installed but I don't know
randr 1.5 needs xorg 1.18 or if the two are decoupled enough so that
can run xorg 1.17 with the nvidia driver and get the benefits of the
monitor features of randr 1.5.

Anyone know the answer to all this? I owe you big if you do.

A question better asked on mailing-lists, but if you need to use
the NVidia drivers, it'd be best to wait until they release new drivers
to avoid mix'n'matching. You can double-check the version of XRandR
supported by the server with "xrandr --version".

With XRandR 1.5, and GNOME 3.18, MST monitors should just work. If they
don't, file a bug against mutter, which handles programming the video


When you say, it should "just work", do you mean that the tiling problem
having now will disapear since gnome desktop will figure out that I only
have 3 monitors and not 6 tiles. Currently, when I go to configure the
displays, it tells me I have 6 displays to work with (two per physical
monitor). If all is right, then the gnome display configuration tool will
only show me 3 monitors to configure? I hope this is what your telling

Yes thats how it is supposed to work afaik (no hardware here to verify).

I installed fedora 23 which has Xorg 1.18 to go with it. I also installed
the latest version of the nvidia driver which now supports Xorg 1.18....
So I'm now looking at xrandr and this is what it reports....

[root office01 ~]# xrandr --version
xrandr program version       1.4.3
Server reports RandR version 1.5

Is this the expected output? 1.4.3 and 1.5? Or is this some kind of fedora
specific port of xrandr in which they didn't push through the 1.5 version?

In anycase, the xrandr --prop output looks like this....

I guess the observation I have is that I still got my MST split screen
looking desktop when running my monitor in MST/DP1.2 mode. I had to turn off
two of the monitors to get a stable setup with the nvidia driver for my
GeForce GTX 970 card.

So the question is, should I proceed to submit a bug report? Or is Fedora 23
not really fully randr 1.5 compliant?

The nvidia driver isn't exposing tile properties.


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