On 2019-03-07 8:05 a.m., Chris Murphy wrote: > On Wed, Mar 6, 2019 at 10:02 PM Graeme Gill <grae...@argyllcms.com> wrote: >> >> Chris Murphy wrote: >> >>> Hmmm. For a while now we've had display calibration+profiling >>> applications compel full screen mode so they're not really usable >>> alongside anything else. They are in effect taking over. So if it's >>> possible for the calibration app to set aside the Wayland session, use >>> drm/kms full screen, and then restore the Wayland session I might be >>> OK with it. But if I have to log out, not OK. >> >> Sorry, as a Color Management application writer, I'm >> not OK with it. I'd be better off firing up my own complete >> copy of Wayland with the CM API's in it and use it >> to talk to drm/kms, rather than trying to write an app to >> talk direct to drm/kms. And of course if that's the easiest >> course, why do that - just incorporate the CM API's in >> stock Wayland and be done with it! > > Not every desktop environment is using the same Wayland compositor, or > even a Wayland compositor at all. So is drm/kms something you can > depend on most of the time regardless of the desktop? > > [...] > > >> [ And why should Linux/Wayland be crippled compared to >> every other system ? I can and do do things like fire up >> a test patch display using ArgyllCMS/dispwin in one corner of my >> screen while running ArgyllCMS/spotread in another window to >> measure the patches. There's no reason not to, and every reason >> to be able to. ] > > Of course. It can take 5-30 minutes to do a calibration and > characterization. In particular if I have 2, 3 or even 4 displays > connected I'd want to calibrate them in sequence while the others are > being used for useful tasks.
It sounds like KMS leases could be a pretty good fit for a calibration application. It can lease each output individually from the Wayland compositor and fully control it using KMS APIs, while the Wayland compositor continues running normally on other outputs. -- Earthling Michel Dänzer | https://www.amd.com Libre software enthusiast | Mesa and X developer _______________________________________________ wayland-devel mailing list wayland-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/wayland-devel
