[Bug 93055] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93055

mmokrejs at fold.natur.cuni.cz <mmokrejs at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |mmokrejs at gmail.com

--- Comment #6 from mmokrejs at fold.natur.cuni.cz <mmokrejs at gmail.com> ---
I just hit this on vanilla 4.6.0, seems it  was triggered when I offlined my
both emulated cores:

[    2.735151] [drm] Initialized drm 1.1.0 20060810
[    2.736925] [drm] DMAR active, disabling use of stolen memory
[    2.737003] [drm] Memory usable by graphics device = 2048M
[    2.737080] [drm] VT-d active for gfx access
[    2.737155] [drm] Disabling PPGTT because VT-d is on
[    2.737233] [drm] Replacing VGA console driver
[    2.744655] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    2.744662] [drm] Driver supports precise vblank timestamp query.
[    2.773463] [drm] Initialized i915 1.6.0 20160229 for 0000:00:02.0 on minor
0
[    2.866014] fbcon: inteldrmfb (fb0) is primary device
[    4.125844] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device

[  165.797309] smpboot: CPU 2 is now offline
[  166.026841] smpboot: CPU 3 is now offline

[  183.364775] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun
[  183.365292] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder A
[  183.365302] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
A FIFO underrun
[  183.380297] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[  183.403654] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder B


This is Dell Vostro 3550 with i7-2640M, BIOS A12. However, I haven't realized
nay graphics output issue.

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