Well, I agree that the terminology might not be the most exact, but I was not expecting that this version will be taken as is, I rather wanted to start a discussion. Since this one has been the only proposal that appeared on the list, I think I did a good thing to start it no matter what confusion it might have caused.

Those, who were present at the meeting, might remember that when we were discussing the possible need of that criterion, there were two approaches:
  1. one card -> two monitors
  2. two cards -> two monitors
and it was not clearly decided which one should be the one.
Now, reading through the above posts, I think we do know it:  one card -> two monitors.

In this rank, I see the following options and this is basically what I wanted to suggest in the conservative criterion and this is also what I fully support. TLDR I think it matches Ben's view:
  • a desktop computer has one graphical adapter with two outputs, so two monitors can be used
  • a laptop has an output for external monitor and it can be used (if the laptop has two cards and the external monitor can only be used when both cards are in operation, then I would rather not block on this or limit this to popular devices (as Adam suggests)).
  • With the gnome-control-center or KDE Settings, it should be possible to organize the monitors and to set-up their modes independently for any of them. I believe that we already have a criterion that could be used when these things do not work with a single (main) monitor.

On Sat, Apr 3, 2021 at 1:53 AM Adam Williamson <adamwill@fedoraproject.org> wrote:
On Thu, 2021-04-01 at 23:36 -0600, Chris Murphy wrote:
> On Thu, Apr 1, 2021 at 1:12 PM Ben Cotton <bcotton@redhat.com> wrote:
> >
> > On Tue, Mar 30, 2021 at 7:27 AM Lukas Ruzicka <lruzicka@redhat.com> wrote:
> > >
> > > I would like to propose a new release covering criterion that was suggested on the yesterday's Blocker Review Meeting. Please let me know, what you think about it and perhaps suggest improvements.
> > >
> >
> > I like the idea of dual monitors being a blocker in general, but as
> > this thread shows, it gets complicated quickly. I think if we do this,
> > it should be very narrowly scoped. The two main use cases we need to
> > worry about are:
> >
> > 1. Laptop with an external monitor (and does it have to be directly
> > attached, or would we block if a monitor attached via a docking
> > station doesn't work?)
> > 2. Desktop with a single video card that drives two monitors
> >
> > I suspect that this would cover most usage without getting too caught
> > up in all of the possible hardware combinations, especially since one
> > major video card manufacturer isn't the best at supporting Linux.
> >
> I agree.

Yeah, I think even the 'conservative' version is a bit too ambitious
for a first movement towards blocking on this. I agree with Ben and
Chris about restricting it to these most-common and most-important
cases, and we might want to hedge it around a bit with reference to the
relevant FAQ sections:


I think personally I'd probably only be inclined to take a bug in this
area as a blocker if it completely broke external output on a popular
laptop line or family (e.g. XPS 13, Thinkpad X1), or broke things
across a popular family or generation of desktop adapters...
Adam Williamson
Fedora QA
IRC: adamw | Twitter: adamw_ha

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Lukáš Růžička


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