i.came.to.get.down

Why? Cause the packages in testing don’t have vidmode enabled by default. (You only care about this if you don’t have RandR support.)
No, really, why? Cause I want to stop going to bed so late. I’d also prefer not to die from cancer. Maybe this will help…

apt-get source gtk-redshift
cd redshift-1.2/
dpkg-buildpackage -rfakeroot -uc -b
cd ..
dpkg -i gtk-redshift_1.2-2_all.deb redshift_1.2-2_amd64.deb

gtk-redshift -l 38.9:104.8 -t 5500:3400 -m vidmode &