FIFO underruns made an appearance on Gemini Lake NUCs. Examples of tests it hits: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4182/shard-glk4/igt@kms_cursor_legacy@cursorb-vs-flipb-toggle.html https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4182/shard-glk4/igt@kms_cursor_legacy@flip-vs-cursor-crc-atomic.html https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4182/shard-glk4/igt@kms_busy@extended-pageflip-modeset-hang-oldfb-render-b.html This might be residual issues from 4.17-rc5 pull, and happened only on one run on host, so we'll follow if it happens again.
Happened again on another same kind of NUC: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4187/shard-glk8/igt@kms_cursor_legacy@cursorb-vs-flipb-toggle.html https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4187/shard-glk8/igt@kms_concurrent@pipe-a.html
https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_1821/shard-glk5/igt@kms_rotation_crc@sprite-rotation-270.html <3> [58.669164] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun <3> [58.852204] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
I observer similar error. Actually my computer typically freezes due to this :/ It typically happens when my computer is a sleep and some gnome nofitication appears on the lock screen. I also suspect it has something to do with my external monitory, which has from time to time hard time to wake up. Also, I suspect it started to happen with Kernel 4.17. 4.16 was almost rock stable for me. I am running Lenovo t470s ~~~ $ uname -a Linux localhost.localdomain 4.18.5-300.fc29.x86_64 #1 SMP Fri Aug 24 17:16:35 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux $ rpm -q kernel kernel-4.17.6-200.fc28.x86_64 kernel-4.17.14-200.fc28.x86_64 kernel-4.18.5-300.fc29.x86_64 ~~~
Created attachment 144100 [details] dmesg I think this issue has been affecting me for a few years now but i just recently started to look into it. my current system is ubuntu 19.04 but this issue was present even when i was using 18.04 and 18.10 and even before that. os: ubuntu 19.04 cpu: intel core i7 6700 graphics (integrated only): hd graphics 530 (skylake gt2) anyway, from time to time only one of my monitors turn on. when that happens `dmesg | grep i915` prints this: ``` ➜ ~ dmesg -e | grep i915 [ +0.000545] i915 0000:00:02.0: vgaarb: changed vga decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem [ +0.000627] [drm] finished loading dmc firmware i915/skl_dmc_ver1_27.bin (v1.27) [ +0.003052] [drm] initialized i915 1.6.0 20181204 for 0000:00:02.0 on minor 0 [ +0.000036] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915]) [ +0.000047] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device [ +0.249846] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *error* cpu pipe a fifo underrun ➜ ~ dmesg -t | grep i915 [sat apr 27 17:47:08 2019] i915 0000:00:02.0: vgaarb: changed vga decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem [sat apr 27 17:47:08 2019] [drm] finished loading dmc firmware i915/skl_dmc_ver1_27.bin (v1.27) [sat apr 27 17:47:09 2019] [drm] initialized i915 1.6.0 20181204 for 0000:00:02.0 on minor 0 [sat apr 27 17:47:09 2019] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915]) [sat apr 27 17:47:09 2019] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device [sat apr 27 17:47:09 2019] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *error* cpu pipe a fifo underrun ``` when i switch to wayland, sometimes none of my monitors turn on at all. once when both turned on, i turned off one and tried to turn it back on again, but it went into energy saving mode. then `dmesg` was showing this: ``` ➜ ~ dmesg -t | grep i915 [sat apr 27 18:14:17 2019] i915 0000:00:02.0: vgaarb: changed vga decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem [sat apr 27 18:14:17 2019] [drm] finished loading dmc firmware i915/skl_dmc_ver1_27.bin (v1.27) [sat apr 27 18:14:18 2019] [drm] initialized i915 1.6.0 20181204 for 0000:00:02.0 on minor 0 [sat apr 27 18:14:18 2019] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915]) [sat apr 27 18:14:18 2019] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device [sat apr 27 18:14:56 2019] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *error* cpu pipe b fifo underrun ➜ ~ dmesg -e | grep i915 [ +0.000664] i915 0000:00:02.0: vgaarb: changed vga decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem [ +0.000861] [drm] finished loading dmc firmware i915/skl_dmc_ver1_27.bin (v1.27) [ +0.016298] [drm] initialized i915 1.6.0 20181204 for 0000:00:02.0 on minor 0 [ +0.000047] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915]) [ +0.000047] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device [ +23.689059] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *error* cpu pipe b fifo underrun ```
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