After upgrading archlinux on Acer Aspire 3680 that using GMA 945 Intel VGA, when reboot, at boot time, after UDEV process, i stuck on black screen. Without any success to boot. After i check on archlinux wiki -> https://wiki.archlinux.org/index.php/Intel i forgot to add KMS (kernel mode settings).
So to solve this, when boot into grub, click e, then insert nomodeset on kernel line, like this pic below: (for grub2 the methods same add nomodeset on line kernel too).
This for booting without intel vga, when login to archlinux, login to user root, then add Module="i915" on /etc/mkinitcpio.conf
#nano /etc/mkinitcpio.confadd Module="i915" like this
Ctrl + X to save, then type
#mkinitcpio -p linux
#reboot.
Blank screen is gone now on Acer Aspire 3680 GMA 945.
Enjoy.