[Bug 80691] New: HDMI audio stops working when drm_kms_helper edid overwrite in place

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80691

          Priority: medium
            Bug ID: 80691
          Assignee: dri-devel at lists.freedesktop.org
           Summary: HDMI audio stops working when drm_kms_helper edid
                    overwrite in place
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: warlock0 at hotmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 101987
  --> https://bugs.freedesktop.org/attachment.cgi?id=101987&action=edit
dmesg

When powering on a PC with radeon gpu (E350 in this case), without an output
device powered on (on the hdmi out), X won't start.
Therefore using drm_kms_helper to overwrite the edid information and forcing
the display to on is needed.

In this combination the hdmi audio output is not working.
It also is not working if the system is started with the overwrite in place and
TV / AVR turned on.
It seems as if the audio codec is not enabled when EDID is loaded with
drm_kms_helper

Expectation: Audio will continue to work when overwriting EDID with
drm_kms_helper.

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