[Bug 81196] New: HDMI drop out

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Jul 10 15:50:46 PDT 2014


          Priority: medium
            Bug ID: 81196
          Assignee: xorg-driver-ati at lists.x.org
           Summary: HDMI drop out
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: nbi at wideopenwest.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

Radeon driver version = 1:7.3.0-1ubuntu3.1

Hardware: HP 4310s laptop, ATI 4330

OS: Linux Mint 17, VLC 2.1.2

HDMI works ok most of the time, but suffers from sporadic random drop outs.
When a drop out occurs kern.log shows:

HDMI: ELD buf size is 0, force 128
HDMI: invalid ELD data byte 0

Also (don't know if relevant) an occasional:

hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger

When a drop out (entire HDMI signal lost - not just audio) occurs VLC continues
playing. A mouse click on desktop causes HDMI output to resume. No screen
blanking or any kind of suspend mode is active so I can't speculate on the
cause of the drop out.

I do however think the driver should be able to gracefully cope with it. At
least provide an optional flag that causes the driver to ignore the trigger
event for the drop out since obviously it's ok most of the time.

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