Using a Projector - Keystone Correction

**Drowz0r** · February 8th, 2019

Hello all

I'm new to using a projector but we want to fix one to the ceiling. I'm told, and looking it up online, that keystone correction may be needed, depending on the keystone correction the projector is able to produce.

Does anyone know of any keystone projection software that is available for Ubuntu, or if there is a native feature that I'm missing?

Thanks

**TheFu** · February 8th, 2019

Keystone correct is part of every projector that I've seen. Use the remote that came with the projector to set it up and forgetaboutit. It isn't something handled by **any** source of video.

**Drowz0r** · February 9th, 2019

I've definitely seen windows software out there do it - just wondered if there was a known Linux one.

There is a keystone correction built in but it's often only around 15 degrees.

**TheFu** · February 9th, 2019

Originally Posted by Drowz0r

I've definitely seen windows software out there do it - just wondered if there was a known Linux one.

There is a keystone correction built in but it's often only around 15 degrees.

Google found this https://lists.freedesktop.org/archiv...er/056056.html - looks like X11 can be used for it. I've never tried. For screen resolution changes, I generally use lxrandr, but it can only enable/disable monitors and alter resolutions. The xrandr manpage has examples for setting up keystone correction. There is a "See Also" mention of xkeystone, but no manpage for it and the program doesn't run for me - it uses an interpreter that I've never heard about, nickle. I installed nickle and xkeystone crashed. Probably some unhandled dependencies.

Maybe the proprietary GPU driver for your card can do something?
Looks like nvidia abandoned theirs https://www.nvidia.com/object/feature_nvkeystone.html

https://ubuntuforums.org/showthread.php?t=1282950 is a prior question here, no answer.

Looks like manually using xrandr is the way.;(

**Drowz0r** · February 9th, 2019

Yeah I've definitely made the screen all weird accidentally on my NVIDIA drivers - but I'm not sure which device I'm hooking up to the projector yet (it hasn't even arrived yet, waiting on the post). I imagine it'll be some low tech thing that can just... fire out movies when needed. Maybe even just a tablet or something. I'll need to experiment.

I'll take a sniff at the link. Thanks.