I retested with both 4.8.4, Ben’s linux-4.9 and linux-4.10 branches (so only
the linux-4.10 branch had the atomic+MST patches).
For all branches, if I bootplug the external screen, I get nothing on the
external screen, and the laptop screen is frozen with some mix of images (but
the laptop itself is not locked up), nothing in dmesg. If I hotplug the screen,
the laptop screen is not frozen, but starting with linux-4.10, I get an EVO
timeout when turning off the external monitor. Adding your patch did not change
anything for me.
Looks like I’ll need to spend some more time testing and bisecting those


On 06:12 am - Nov 08 2016, poma wrote:
> On 21.10.2016 10:56, Pierre Moreau wrote:
> > On 01:15 am - Oct 21 2016, Lukas Wunner wrote:
> >> On Thu, Oct 20, 2016 at 10:08:28AM +0200, Lukas Wunner wrote:
> >>> On Wed, Oct 19, 2016 at 07:58:06PM +0200, Pierre Moreau wrote:
> >>>> For example, my laptop (which also has an NVAC) has been triggering the
> >>>> no-signal message on external monitors way before Ben???s patch landed,
> >>>> but only for some adapters. I haven???t tried Ben???s patch yet, nor
> >>>> yours, but I will certainly do it, and see what effect each of them has.
> >>>
> >>> The external DP port on your MBP5,3 is switchable between GPUs and
> >>> the apple-gmux driver switches it in unison with the panel.  Thus
> >>> the NVAC cannot drive external displays when gmux is switched to
> >>> the MCP79.  (You probably were aware of this, just wanted to mention
> >>       ^^^^^
> >> I meant G96, sorry I mixed it up.
> >>
> >> Lukas
> > 
> > Yes, that bit had stayed in my memory, that switching between the two GPUs
> > would not only switch them for the laptop screen, but for the external ones 
> > as
> > well. IIRC, I am getting the no signal in both cases, but I need to retest.
> > 
> > Pierre
> Any news related on your side?

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