[Bug 80896] [BDW Regression]dmesg error "<3>[ 1.954836] [drm:gen8_irq_handler] *ERROR* The master control interrupt lied (SDE)!" after boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80896

--- Comment #3 from Guo Jinxian <jinxianx.guo at intel.com> ---
Created attachment 102730
  --> https://bugs.freedesktop.org/attachment.cgi?id=102730&action=edit
dmesg

(In reply to comment #2)
> No need to bisect, the error message was introduced by Oscar in
> 
> commit 38cc46d73ed99dd7002f1406002e52d7975d16cc
> Author: Oscar Mateo <oscar.mateo at intel.com>
> Date:   Mon Jun 16 16:10:59 2014 +0100
> 
>     drm/i915/bdw: Ack interrupts before handling them (GEN8)
> 
> And for those reason bit 23 of master ctl is set and the SDE IIR is 0.
Revert this commit on latest -next-queued，error "<3>[ 1.955683]
[drm:gen8_irq_handler] *ERROR* The master control interrupt lied (SDE)!" unable
to reproduce, but here has another error. Please check the output below. Need
we report a new bug for this?

Output:
[root at x-bdw01 ~]# dmesg -r | egrep "<[1-3]>" |grep drm
<3>[    2.753243] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[    2.768133] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[    2.780219] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[    2.792092] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[    2.804271] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[    2.813306] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[    2.831054] [drm:intel_dp_start_link_train] *ERROR* failed to update link
training
<3>[    2.832254] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting

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