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 it in case you weren't.) (In theory we could change vga_switcheroo and apple-gmux to support switching the panel and the external port separately rather than in unison if there is demand. It's only supported on MBPs introduced from 2008 to 2010 though, the 2011+ models can only drive external ports with the discrete GPU.) Best regards, Lukas _______________________________________________ Nouveau mailing list Nouveau@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/nouveau