[Bug 106478] New: Vertical line corruptions seen on the left side of Gen 9+ display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106478

            Bug ID: 106478
           Summary: Vertical line corruptions seen on the left side of Gen
                    9+ display
           Product: DRI
           Version: DRI git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: azhar.shaikh at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 139502
  --> https://bugs.freedesktop.org/attachment.cgi?id=139502&action=edit
vertical corruption after disabling cursor

Vertical display corruption is seen on GEN9 and above displays. This issue is
more prominent when using an external display. Attaching the image which shows
the corruption. 

There is a patch
(https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/877396/
) submitted on chromeos kernel which fixes the issue on chromeos kernels and
even on upstream kernel. 

The upstream change which introduced the check is:

commit a5509abda48ecfc133fac6268e83fc1a93dba039
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Fri Feb 17 17:01:59 2017 +0200

    drm/i915: Fix legacy cursor vs. watermarks for ILK-BDW

There are many updates seen to this part of code which skip the vblank waits
for cursor updates. But looks like we still need the vblank wait(slowpath) on
Gen9+ displays too.

So having the same fix on upstream kernel as the chromeos fix, is a correct
solution here? Will it cause underruns on ILK-BDW? or some other effects?

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