On Fri, Jun 04, 2010 at 05:04:37AM +0800, David Härdeman wrote:
> On Tue, Jun 01, 2010 at 10:07:59PM +0800, Wu Fengguang wrote:
> > On Mon, May 31, 2010 at 10:06:23AM +0800, Zhenyu Wang wrote:
> >>On 2010.05.31 09:34:04 +0800, Wu, Fengguang wrote:
> >>>On Sun, May 30, 2010 at 07:49:13PM +0800, David Härdeman wrote:
> >>>> I recently tried played with the video= kernel parameter, and
> >>>> booting with:
> >>>> video="HDMI Type A-1:1920x1080@60D"
> >>>>
> >>>> gives me a proper video mode from the beginning. However, it also
> >>>> seems to break HDMI audio. Booting with that parameter ->no audio,
> >>>> receiver doesn't light up, etc. Booting without that parameter
> >>>> ->audio works as expected.
> >>>>
> >>
> >> yeah, I think that won't setup the audio enable bit on HDMI port
> >> properly, as drm/i915 driver checks EDID block for real HDMI sink
> >> device, and only in that case it will enable audio, ignore other case
> >> like DVI.
> >
> > Maybe could allow users to manually set/unset that bit.
>
> Yes please? :)
>
> > David, you may check the intel_audio_dump tool in
> >
> > git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
> >
> > It will show whether your SDVO_AUDIO_ENABLE bit is set (grep for
> > "Audio_Output_Enable" or "audio enabled").
> >
> > If unset, you can trivially set the bit with
> > intel_reg_read/intel_reg_write.
> > (I'm not sure if this will magically make audio work though.)
>
> I tried manually changing the SDVOB bits, and it temporarily enabled
> audio (until I changed from one video clip to another). There's also
> other bits that differ so I guess that the channel mapping etc might be
> messed up.
It seems that besides the SDVOB audio enabled bit, the ALSA driver
thinks that there are no HDMI monitor attached. This can be verified
with
$ head -1 /proc/asound/card0/eld\#1.0
monitor_present 0
You may try manually setting it
# echo monitor_present 1 > /proc/asound/card0/eld\#1.0
> Attached is the output from intel_audio_dump with working audio (without
> forced KMS mode) and without (with forced KMS mode). The diff between
> them is:
If the above trick does not work, would you please post the dmesg and
intel_audio_dump output in forced KMS mode for the first clip (with
sound) and second clip (silence again)?
Thanks,
Fengguang
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