If you have recently updated arch Linux you may face a flickering issue when system boots into GDM (login window) however the flickering is gone after successful login  , after few searches i have found the solution.

You can see more details about this bug here  : https://bugs.archlinux.org/task/44779 (caused by Linux 4.0.1(x86_64) kernel)

To fix the issue

uncomment the line

in /etc/gdm/custom.conf

then restart the system.

arch linux screen flickering after update – Fixed
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