Error message from kernel: intel_set_cpu_fifo_underrun_reporting [i915]], ERROR uncleared fifo underrun. What does it mean, what to do?

asked 2016-06-07 09:04:41 -0500

florian gravatar image

updated 2016-06-07 09:27:37 -0500

Since a few days, must be in conjunction with new kernel 4.5.5, my Fedora 23 Workstation output some weird error message that I don't understand. Is this something to worry? Should I file a bug against kernel?

kernel: [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A
kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
kernel: [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
kernel: [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B
kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
kernel: [drm:intel_check_pch_fifo_underruns [i915]] *ERROR* pch fifo underrun on pch transcoder B
kernel: [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A
kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
kernel: [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
kernel: [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B
kernel: [drm:intel_check_pch_fifo_underruns [i915]] *ERROR* pch fifo underrun on pch transcoder B
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Comments

@florian It's reporter, add you to cc an provide all information you can related to it bugzilla.redhat an now I realice that maybe your kernel-regression-test doesn't end sucessfull, comment it too, regards

hhlp gravatar imagehhlp ( 2016-06-08 09:51:01 -0500 )edit

@hhlp. Thanks for your message. I searched bugzilla but couldn't find the error. Thanks for spotting it and linking it here.

Yea, was also thinking if kernel-test may be related. Will see...

florian gravatar imageflorian ( 2016-06-08 10:00:27 -0500 )edit

I am also wondering if the following systemd messages are related to it, and if I should worry about it. http://pastebin.com/PdQkwWtW

Lines of concern are 15,16...

florian gravatar imageflorian ( 2016-06-08 10:17:27 -0500 )edit