I came here to post just that. I don't use f.lux because it doesn't ship packages for anything but ubuntu... The beauty of redshift is that you can just stick it in a shell script and start it with every desktop session.
I have been using it with the following parameters:
redshift -l <my latitude>:<my longitude> -t 6500:5200 -g 0.8 -m vidmode
This results in slightly reduced gamma all the time but only a moderate redshift that doesn't offset colours too much. I have it set to autostart and I really don't notice it being there, however I do notice it is missing when switching users or OSes!
Does anyone else here use f.lux on Linux? I installed the Ubuntu version but not only does the "pause/unpause" option sometimes do nothing at all but other times it simply forgets to change the colors.
I have it working reliably here (64-bit Ubuntu 12.04), though it is noticeably lacking a lot of the configuration options available in the Windows/OS X versions.
Tried it 2 or so years ago, had same issues mentioned by others, discovered redshift, been working perfectly since. Maybe flux is good now too, don't know.
Another vote for Redshift. Use Flux on work PC and Redshift on laptop. The colour transition seems to be a lot more subtle with Redshift and I find it easier to adjust. On the other hand, the change feels very sudden with Flux. Often use my laptop in work, but I suppose it could well just be a difference in lighting between home and the office, as others have mentioned. Maybe my eyes deceive me.
redshift has constant problems with it's geolocate service in recent versions of Ubuntu. Not sure what the issue is, but you can specify the longitude and latitude to circumvent it. I use, for example:
redshift -l <long>:<lat>
I've not had good luck with the f.lux port for linux.
I have been using it with the following parameters: redshift -l <my latitude>:<my longitude> -t 6500:5200 -g 0.8 -m vidmode
This results in slightly reduced gamma all the time but only a moderate redshift that doesn't offset colours too much. I have it set to autostart and I really don't notice it being there, however I do notice it is missing when switching users or OSes!