System sometimes locks up when idle and screen is blank
This problem is thought to be caused by a bug that is triggered when the GPU goes into a power saving mode.
Disable GPU power saving by adding the following line to /etc/default/grub:
i915.i915_enable_rc6=0
Then regenerate the GRUB configuration:
# grub2-mkconfig -o /boot/grub2/grub.cfg
Reboot the system for the option to take effect. The current setting can be checked with the following command:
# cat /sys/module/i915/parameters/i915_enable_rc6 0