On 19 July 2015 at 18:34, Mario Kleiner <mario.kleiner...@gmail.com> wrote: > On 07/18/2015 01:09 PM, Dave Airlie wrote: >>>>> >>>>> >>>>> We can disable it by default on exa - intel and amd/radeon drivers also >>>>> disable by default. However, on gpus >= maxwell only glamor accel is >>>>> supported and glamor on nouveau is either dri3/present or no hw accel >>>>> at >>>>> all >>>>> afaics. >>>> >>>> >>>> >>>> You probably saw my patches to just remove glamor from nouveau :) That >>>> integration doesn't support DRI2, which in turn means no core contexts >>>> (due to lack of GLX_ARB_create_context_profile), and a slew of other >>>> issues. Seemed easier to just tell people to go use modesetting, which >>>> gets all of these things right(er). >>>> >>> >>> Hm, a total removal would at least make me and my users rather unhappy >>> atm., >>> as without glamor no hw accel at all on >= maxwell. modesetting and >>> nouveau >>> are not on par feature-wise atm. E.g., modesetting as of the next xorg >>> 1.18 >>> server only provides pageflipping via dri3/present and without >>> pageflipping >>> it is game over for many of my use cases on nouveau-kms. Also modesetting >>> currently completely lacks ZaphodHeads support. Without ZaphodHeads i >>> can't >>> have a page-flipped fullscreen window on one subset of outputs and a >>> regular >>> desktop on another subset, something that is needed for >>> neuroscience/medical/vr applications. >> >> >> So what would you want in modesetting to be on par? >> >> DRI2 pageflipping? > > > Probably not needed? I debugged and tested the DRI3/Present page flipping > with modesetting a few months ago. Haven't retested the most recent version > of the patches in x-server master, but at that time they seemed to work > pretty ok. I'll give this some more testing soon. I also ran it as my > desktop for 2-3 days, afair without serious issues, but that wasn't the kind > of obsessive stress testing i do for the OpenGL fullscreen pageflipping > stuff. > > I do remember dpms activity was a crasher last time i tested. Maybe resolved > now? > >> zaphod heads? >> > > Mostly Zaphodheads would be the really important one for me. Lack of it = > show stopper for many of my users applications. Users often want to split > their gpu into at least 2 x-screens: One for the "operator" to control > experimental work sessions via a regular desktop GUI, the other for one > unredirected kms-pageflipped fullscreen window on one or multiple attached > Zaphodheads outputs for the actual presentation on the 2nd x-screen, e.g., > single display, or dual display for stereoscopic stuff - stereo goggles and > such, or > 2 displays for more advanced VR stuff. The page flipping is > important in my case because precise timing and precise timestamping is > important which we only get with page flips, also to get out pixels as > bit-exact as possible without interference from compositors, e.g. texture > mapping artifacts etc. On DRI3/Present, page flips are also the only way > atm. to get tear-free Presents, the way it is implemented. > > More regular users seem to like to have a separate x-screen for TV sets and > use ZaphodHeads for that. > > The current nouveau or radeon implementation would be a good reference for > one that seems to work well with multiple ZaphodHeads per x-screen + 1 extra > patch of mine against nouveau floating on nouveau-devel "[PATCH] Take shift > in crtc positions for ZaphodHeads configs into account." That patch is > needed for nouveau-ddx, or any generic driver that deals with nouveau-kms. > Afaics the other kms drivers return a kencoder->possible_crtcs mask which > allows any crtc to go with any encoder, but nouveau-kms gets that info from > the VBIOS DCB and sometimes the mask is a bit more special and needs the > extra treatment from that patch, or bad things will happen, e.g., on some > nv-50 cards. > >> anything else? I would like for F23 to ship a modesetting which I can >> replace intel/nouveau/ati with. > > > Not at the moment. I'll think about it some more and give the current > modesetting driver a bit more testing to see if something shows up.
Hi Mario, just to follow up, I posted a patch to xorg-devel to add Zaphod support to modesetting, it at least starts here! Can you take a look at it and let me know what else it might need doing, since I see you've been active in the other drivers. Dave. _______________________________________________ Nouveau mailing list Nouveau@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/nouveau
