[Bug 111507] Unable to detect monitor modes connected to a TB16 Dell dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111507

--- Comment #26 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
(In reply to Lionel Landwerlin from comment #25)
> (In reply to Stanislav Lisovskiy from comment #23)
> > (In reply to Lionel Landwerlin from comment #22)
> > > (In reply to Stanislav Lisovskiy from comment #21)
> > > > It is kernel command line, which can be edited same way as you add
> > > > drm.debug=0x1e in grub.cfg, just add 3 after drm.debug, so that it looks
> > > > like "drm.debug=0x1e 3". This will make it boot into console mode, without
> > > > GUI, however if it works
> > > > that way we will know at least whether this is GDM messing up things or some
> > > > problem in the kernel.
> > > 
> > > I don't have a splash screen during the boot, so before GDM starts, I can
> > > see the console on both monitors. Is that what you wanted to know?
> > 
> > How about unplug/plug the display in the console mode? Does it work reliably?
> 
> Yep, works fine.

Please "Revert "drm/i915: Fix DP-MST crtc_mask" from Ville, most likely the
issue is caused by this. Ville's change itself was correct as I understand
however Mutter and some other userspace apps does some stuff like
"intersecting" possible crtc mask which results to 0 after this change. For
console as we checked it does it properly, which explains why you don't have it
there.
So please revert this change you had bisected to and check if that helps.

-- 
You are receiving this mail because:
You are the assignee for the bug.
You are the QA Contact for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20190904/d3baeab0/attachment.html>