I have the same or a similar problem on kernel version 4.13.4, Ubuntu 17.10.
Not sure whether it is exactly the same though. In syslog I see the FIFO underrun message is preceded by a lot of other ERROR messages: Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.055663] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.055726] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.072359] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.072425] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.089055] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.089122] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.105722] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.105788] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.112465] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.139057] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.139116] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1550779 Title: [i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1550779/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
