[Bug 89857] New: display getting garbled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89857

            Bug ID: 89857
           Summary: display getting garbled
           Product: DRI
           Version: unspecified
          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: sudipm.mukherjee at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

my display was getting garbled for a moment very frequently. it looked
like when the screen was getting refreshed then something was going
wrong.
git bisect gave <0f71979ab7fbd0c71c41c2798de3d33937915434> as the first bad
commit, and after reverting it now display is not having that problem.

lspci -k gives:
"VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core
processor Graphics Controller (rev 09)
Subsystem: Foxconn International, Inc. Device 0d74
Kernel driver in use: i915"

This is my bisect log:
# bad: [e42391cd048809d903291d07f86ed3934ce138e9] Linux 4.0-rc6
# good: [b7392d2247cfe6771f95d256374f1a8e6a6f48d6] Linux 3.19-rc2
git bisect start 'v4.0-rc6' 'v3.19-rc2' '--' 'drivers/gpu/drm/i915/'
# good: [d2182a660808d9053a605e3ebc8c46a323ec6e5d] drm/i915: Don't register
HDMI connectors for eDP ports on VLV/CHV
git bisect good d2182a660808d9053a605e3ebc8c46a323ec6e5d
# bad: [36d21f4c557a2b18ed7c9d254060d4ca07a6c5c7] drm/i915/dsi: remove
unnecessary dsi device callbacks
git bisect bad 36d21f4c557a2b18ed7c9d254060d4ca07a6c5c7
# good: [72f95afa5faaf899f7344879b6ccd5f0cb271b28] drm/i915: Removed duplicate
members from submit_request
git bisect good 72f95afa5faaf899f7344879b6ccd5f0cb271b28
# good: [2844a9214759901f382086644842e39ad6f7d894] drm/i915: Use pipe_name() in
the get_plane_config() functions
git bisect good 2844a9214759901f382086644842e39ad6f7d894
# bad: [1b842c89bd8eb0e9619e1aba071c9a5529b7a179] drm/i915: Fix kzalloc()
smatch warnings in get_initial_plane_config()
git bisect bad 1b842c89bd8eb0e9619e1aba071c9a5529b7a179
# good: [8d360dffd6d8634868e433128d5178bea14cc42c] drm/i915: Specify bsd rings
through exec flag
git bisect good 8d360dffd6d8634868e433128d5178bea14cc42c
# good: [1197b4f230fb7c8fe3a9b549596fe130b09a0db2] drm/i915: Balance context
pinning on reset cleanup
git bisect good 1197b4f230fb7c8fe3a9b549596fe130b09a0db2
# bad: [0f71979ab7fbd0c71c41c2798de3d33937915434] drm/i915: Performed deferred
clflush inside set-cache-level
git bisect bad 0f71979ab7fbd0c71c41c2798de3d33937915434
# good: [a7cbedec8317a5cacecb567674fdbc1c3fb22de8] drm/i915: Rename unpin_count
to pin_count
git bisect good a7cbedec8317a5cacecb567674fdbc1c3fb22de8

please let me know if you need any more information.

Regards
Sudip

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