[Bug 98251] [ILK][BAT] kms_pipe_crc_basic/nonblocking-crc-pipe-b underrun Dmesg Warnings

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98251

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 features|                            |display/watermark
           Priority|medium                      |highest

--- Comment #1 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
I had though I fixed all the ILK underruns (well, all the ones not related to
cursor watermarks and/or sprite scaling which can still cause genuine underruns
easily), but now they seem to be back. So I suspect we have a regression on our
hands. Either that or it's due to eg. a hardware change.

Looking at the long term history for ilk-650, the first occurance seems to be
at CI_DRM_1688, but since the problem seems fairly sporadic, I can't be sure it
doesn't go further back. We have no results going back much further than that.
Though in recent times (maybe since CI_DRM_1706, or thereabouts) we seem to
have even more of these.

kms_pipe_crc_basic seems the most prominent offender here, but it looks like
kms_busy and drv_module_reload_basic have also hit these.

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