Messages in this thread | | | Date | Wed, 28 Aug 2019 16:19:43 +0300 | From | Mika Westerberg <> | Subject | Re: Thunderbolt DP oddity on v5.2.9 on iMac 12,2 |
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On Wed, Aug 28, 2019 at 06:43:35PM +0800, Brad Campbell wrote: > On 28/8/19 6:23 pm, Mika Westerberg wrote: > > > On Wed, Aug 28, 2019 at 05:12:00PM +0800, Brad Campbell wrote: > > > > Apart from the warning in the log (which is not fatal, I'll look into > > it) to me the second path setup looks fine. > > > > Can you do one more experiment? Boot the system up without anything > > connected and then plug both monitors. Does it work? > > > > Aside from head ordering issues in X it works just fine. > I've attached the dmesg. Boot with nothing plugged in, then plug in 0-1 and > 0-3 in that order.
OK, thanks for checking. So when Linux is in complete control both DP tunnels get created properly. I suspect there is something different what the firmware does compared to other Macs I've been using and that causes the driver to fail to discover all the paths. I will take a look at this but I'm away tomorrow and friday so it goes to next week.
BTW, have you tried to chain the two monitors?
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