On 14/02/2020 18:53, Marek Szuba wrote: > Hello, > > I do quite a lot of photo editing on my box and with both my monitors > and my graphics card (amdgpu) supporting 10-bit colour channels, I tend > to run X at colour depth 30. Unfortunately some software, most notably > programs using OpenGL it seems, refuse to run in this mode - presumably > (I have seen this mentioned as the reason of problems with 30-bit mode > under Windows when the first cards supporting it came out) because the > software assumes 8-bit alpha channel but with the frame buffer still > being only 32-bit it is only 2-bit. Seeing as there seem to be no way of > switching colour depth on the fly, the best I have been able to come up > with is two separate X sessions - one at depth 30 and one at 24. > > Is there, or perhaps will there be some way in the near future, to work > around this problem - either by increasing framebuffer BPP (tried it a > while ago but it didn't seem to accept anything more than 32), using a > virtual X server (tried using Xephyr but it complained about there being > no matching screen), or some other way I haven't thought of? If you don't mind the indirection this introduces: xpra start --start=xterm --attach=yes This will start your application (ie: xterm) on a 24-bit virtual framebuffer and display it on your local 30-bit display. The pixel depth upscaling will be done by your OpenGL driver, or failing that, in software.
The reverse is also possible, with a local display at 24-bit: xpra start --start=xterm --attach=yes --pixel-depth=30 Runs the app on a 30 bit virtual display. Apparently, there are apps that require a 30-bit display to use GPU image processing and some users don't care if they don't actually see the extra bit depth when doing so. Antoine > > Thank you in advance for your comments. > _______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: https://lists.x.org/mailman/listinfo/xorg Your subscription address: %(user_address)s
