[Bug 102818] New: [BSW] image corruption issue after edd849e5448c4f6ddc04a5fa1ac5479176660c27

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102818

            Bug ID: 102818
           Summary: [BSW] image corruption issue after
                    edd849e5448c4f6ddc04a5fa1ac5479176660c27
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: freedesktop at nmacleod.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

A user has reported an intermittent issue since 4.12-rc1 which manifests as a
"z" shaped flicker/breakup of the displayed image.

The OS is LibreELEC with latest mainline kernel, running Kodi 18.

Since a picture is worth a thousand words, you can view the issue in two short
videos:

Video #1[1]: flicker at 1s, 10s and 12s
Video #2[2]: flicker at 1s and 8s

The user has tested with two different HDMI cables and two different TVs, and
the result is the same.

I bisected the kernel with the user (bisect log attached) and the bad commit[3]
is:

Merge tag 'drm-misc-next-2017-03-21' of
git://anongit.freedesktop.org/git/drm-misc into drm-next

Unfortunately this is a merge commit, but it seems to be in the right area.

The kernel log with "drm.debug=0xe" is attached, as is Xorg.0.log.

Unfotunately it hasn't been possible to obtain a vbios dump.

The user has tried on two TVs with two different cables, and the same problem
is present with all combinations:

TV #1: Sony KDL 32EX521 SW:PKG3-309-EUA-0104 (1080p, 6 years old)
TV #2: Sony KDL 49X8305C SW:PKG3-473-0107EUB (4K, 1 year old)
Cable #1: Belkin High speed 3m #49749
Cable #2: Startech 1m Highspeed 20276

The PC configuration is:

CPU: Intel Atom x5-E8000 (Braswell) @ 1.04GHz (SolidRun IB8000 SOM[4])
GPU: Intel HD Graphics 400
Driver: intel-vaapi-driver 1.8.3, libva 1.8.3, mesa 17.2

The issue is still present with kernel 4.13.2 and 4.14-rc1.

I'd be happy to create test builds with patches for the user to try out.

Many thanks.

1. http://milhouse.libreelec.tv/other/vsync_issue/IMG_0403.MOV (27MB)
2. http://milhouse.libreelec.tv/other/vsync_issue/IMG_0406.MOV (18MB)
3.
https://github.com/torvalds/linux/commit/edd849e5448c4f6ddc04a5fa1ac5479176660c27
4.
https://www.solid-run.com/intel-braswell-family/braswell-som-system-on-module/braswell-som-specifications/

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