Manual and options for the "modesetting" driver

David Narvaez david.narvaez at
Thu Jun 18 20:13:40 PDT 2015

On Thu, Jun 18, 2015 at 10:12 PM, Stefan Monnier
<monnier at> wrote:
> >> I'm trying to use the "modesetting" driver for a dual-monitor setup
> >> using a displaylink adapter and a Poulsbo card, and where the monitors
> >> are rotated and where I only want 16bpp.
> >> The only part I managed to get is an output on my Poulsbo-connected
> >> monitor, but all the other things I specified in my xorg.conf seem to be
> >> ignored, so: is there a manual somewhere listing the available options
> >> (I've discovered "kmsdev" so far)?
> > Now things goes with xrandr command , type xrandr , see what Xorg.bin
> > detects .
> That's part of the problem:
> - "xrandr --listproviders" shows two cards, confirmaing that the
>   displaylink is found.
> - yet "xrandr" only shows one screen and one monitor (which is the
>   monitor connected to the Poulsbo card).
> - How do I run "xrandr" to rotate the GDM login screen?

I do

$ xrandr --setprovideroutputsource 1 0

David E. Narvaez

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