Linux Tricks

Color change when connected remotely

Problem: after opening vnc session to linux machine from macbook laptop, small window pops up asking about some color settings (create color profile etc), and keeps asking for password; none of passwords actually works, and it keeps asking again and again.

Fix: on linux machine, create file /etc/polkit-1/localauthority/50-local.d/45-allow-colord.pkla with permissions 644 and following contents:

[Allow Colord all Users]
Identity=unix-user:*
Action=org.freedesktop.color-manager.create-device;org.freedesktop.color-manager.create-profile;org.freedesktop.color-manager.delete-device;org.freedesktop.color-manager.delete-profile;org.freedesktop.color-manager.modify-device;org.freedesktop.color-manager.modify-profile
ResultAny=no
ResultInactive=no
ResultActive=yes

Enable systemd log persistency (remember all reboots, not only last one)

Run emacs /etc/systemd/journald.conf, set

Storage=persistent

Do following:

mkdir /var/log/journal
systemd-tmpfiles --create --prefix /var/log/journal
systemctl restart systemd-journald