[Bug 74800] intel-virtual-output shows different resolutions under certain conditions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74800

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #11)
> I understand what you are saying.
> 
> Wouldn't this changes reflect in "xrandr -d :8" ?
> It never showed up a 1920x1080 mode there.

I think if you rewrote xrandr to monitor notifications, then you would also see
it occur. It's certainly odd. The only thing I am confident about is that those
modes are being generated on the remote :8 display and reported on HDMI-0. I
have no idea why, and they also occur on the first read of modes. One thing
that does occur, is that i-v-o uses the equivalent of xrandr --current (which
does not force a reprobe of the outputs).

> Another interesting thing.
> If I remove the HDMI connector, nvidia fallsback to a 800x600 only mode (the
> same happens when bumblebee starts with no heads).
> The VIRTUAL1 display shouldn't fall to 800x600 also?

No. Aiui, the fallback mode is just a mode set on no outputs, it is just the
framebuffer size set when nothing is connected. (In -intel, we also provide a
similar fallback.) Since there is nothing connected on any output, i-v-o
reports nothing connected. (Checking xrandr -d :0/:8 should confirm that.)

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