GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dc=0
intel_idle.max_cstate=2"
Its fixed. I update grub with this line and problem solved.
** Changed in: gnome-shell (Ubuntu)
Status: Expired => Confirmed
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https://bugs.launchpad.net/bugs/2065827
Title:
Screen is blinking at specific points. Its happening firefox app,
application screen.
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