[Bug 82349] HDMI audio stops working when drm_kms_helper EDID overwrite is in place

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82349

Jolan Luff <jolan at gormsby.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |---

--- Comment #10 from Jolan Luff <jolan at gormsby.com> ---
Hi,

I can confirm that this patch works; tested with 4.0-rc5.

Background:

I have an ASUS Chromebox (Celeron 2955U) connected to an Onkyo RT-393 AVR via
HDMI.  It very rarely (5-10% of the time) can initiate a successful handshake
to the AVR so I dumped the EDID and have been using grub to enable the output
and force the EDID:

drm_kms_helper.edid_firmware=HDMI-A-1:edid/edid.bin video=HDMI-A-1:D

This caused video to work 100% of the time but audio to work 0% of the time;
eld was always empty and the AVR was indicating no signal:

/proc/asound/card0/eld#0.0
monitor_present    0
eld_valid    0

Now with this patch I rebooted and audio/video worked 3/3 times which has never
happened in the ~6 weeks that I've had this hardware combo.

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