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I have recently noticed these errors on startup (they occur every startup):

Jun 29 08:07:09 MATRIX kernel: [   10.773473] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
Jun 29 08:07:09 MATRIX kernel: [   10.773876] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
Jun 29 08:07:09 MATRIX kernel: [   10.773895] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

What do they mean and what should I do about them?

OS Information:

Description:    Ubuntu 15.04
Release:    15.04
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    There is an entry for this bug on a Kernel Bug Tracker:

    https://bugzilla.kernel.org/show_bug.cgi?id=79261 It seems that this error message should be a debug message only, so nothing serious.

     – tommyk Feb 16 '16 at 18:28
  • @tommyk: Perhaps post an explanation of that as an answer. –  May 14 '17 at 10:09

2 Answers2

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There is an entry for this bug on a Kernel Bug Tracker: bugzilla.kernel.org/show_bug.cgi?id=79261 It seems that this error message should be a debug message only, so nothing serious. It has been fixed anyway in 4.3.0-040300-generic

tommyk
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In my experience, i have accidentally caused this by installing ubuntu with UEFI "Secure Boot" enabled, and then trying to boot with "Secure Boot" disabled, try re-enabling it in your BIOS if you have it disabled.

Tyson Kennedy
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