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I have a small problem with my Thinkpad T480s. After I updated it from Fedora 29 to 30, and an external screen is connected to it, my laptop screen flickers sometimes. Note that I use XORG instead of Wayland.

I've tried several things already:

  1. I tried to install the latest stable kernel from Vanilla 5.1.9-350.vanilla.knurd.1.fc30.x86_64

  2. Added these options in GRUB_CMDLINE_LINUX in the file /etc/default/grub: intel_iommu=on,igfx_off i915.enable_psr=0 i915.enable_rc6=0. And updated the GRUB by using sudo grub2-mkconfig -o /boot/grub2/grub.cfg.

  3. I also did an BIOS update to version 1.31.

All these things didn't work.

For information, DMESG: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

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