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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - drm/i915: Intermittent flicker (bisected)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97283">97283</a>
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<th>Summary</th>
<td>drm/i915: Intermittent flicker (bisected)
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<th>Product</th>
<td>DRI
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>mymailclone@t-online.de
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<pre>Hi!
Noticed an intermittent flicker of the monitor (part goes black for a fraction
of a second) with kernel 4.4.10.
dmesg showed the following messages:
[drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[drm:ironlake_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
Bisected it to this commit:
<span class="quote">> git bisect bad</span >
8e1001c5638e244ab9a2ddddf5466b05ddf6af77 is the first bad commit
commit 8e1001c5638e244ab9a2ddddf5466b05ddf6af77
Author: Shashank Sharma <<a href="mailto:shashank.sharma@intel.com">shashank.sharma@intel.com</a>>
Date: Thu Apr 21 16:48:32 2016 +0530
drm/i915: Fake HDMI live status
commit 60b3143c7cac7e8d2ca65c0b347466c5776395d1 upstream.
This patch does the following:
- Fakes live status of HDMI as connected (even if that's not).
While testing certain (monitor + cable) combinations with
various intel platforms, it seems that live status register
doesn't work reliably on some older devices. So limit the
live_status check for HDMI detection, only for platforms
from gen7 onwards.
V2: restrict faking live_status to certain platforms
V3: (Ville)
- keep the debug message for !live_status case
- fix indentation of comment
- remove "warning" from the debug message
(Jani)
- Change format of fix details in the commit message
Fixes: 237ed86c693d ("drm/i915: Check live status before reading edid")
Suggested-by: Ville Syrjala <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
Signed-off-by: Shashank Sharma <<a href="mailto:shashank.sharma@intel.com">shashank.sharma@intel.com</a>>
Link:
<a href="http://patchwork.freedesktop.org/patch/msgid/1461237606-16491-1-git-send-email-shashank.sharma@intel.com">http://patchwork.freedesktop.org/patch/msgid/1461237606-16491-1-git-send-email-shashank.sharma@intel.com</a>
Signed-off-by: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
(cherry picked from commit 4f4a8185011773f7520d9916c6857db946e7f9d1)
Signed-off-by: Jani Nikula <<a href="mailto:jani.nikula@intel.com">jani.nikula@intel.com</a>>
Signed-off-by: Greg Kroah-Hartman <<a href="mailto:gregkh@linuxfoundation.org">gregkh@linuxfoundation.org</a>>
:040000 040000 6e90ff06fc964d1ddbb57155f8a42b840ea563d9
f76dff57b7ea8aa4d8cd66544eefc0a0b6c37a3d M drivers
---
Regards!
Jay</pre>
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