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[Daniel Vetter]

On Wed, Sep 26, 2012 at 04:04:43PM -0500, Ian Pilcher wrote:
> On 09/26/2012 12:00 PM, Adam Jackson wrote:
> >On Tue, 2012-09-25 at 13:47 -0500, Ian Pilcher wrote:
> >>
> >>1.  The display (LG L246WP) is confused by *any* InfoFrames.
> >
> >If this is still the case after applying:
> >
> >commit adf00b26d18e1b3570451296e03bcb20e4798cdd
> >Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
> >Date:   Tue Sep 25 13:23:34 2012 -0300
> >
> >     drm/i915: make sure we write all the DIP data bytes
> >
> >Then I suspect I'm compelled to agree that we need a quirk to forcibly
> >disable InfoFrames entirely.  I don't like to be difficult about this,
> >but the HDMI spec is quite clear that sinks _must_ accept InfoFrames
> >defined in either the CEA or HDMI specs, so if we're seeing that class
> >of failure I tend to strongly suspect our drivers first.
> 
> I just tested with that patch applied, and the problem still exists, so
> consider yourself compelled.
> 
> Unless you object, I will go ahead and create a patch series that does
> only:
> 
> - user-defined EDID quirks
> - DISABLE_INFOFRAMES quirk
> - DISABLE_INFOFRAMES quirk for LG L246WP
> 
> (I will specifically *not* address the audio issue in this series.)
> 
> >>3.  drm_detect_monitor_audio is returning true for the LG L246WP, which
> >>      definitely doesn't have any audio capabilities.  This may be a bug
> >>      in the display's EDID, or it may be a parsing error.
> >
> >The display is definitely a filthy liar then:
> >
> >   Audio data block
> >     Linear PCM, max channels 1
> >     Supported sample rates (kHz): 48 44.1 32
> >     Supported sample sizes (bits): 24 20 16
> >
> >Hooray for hardware.  Not sure what the logic should be for whether to
> >send HDMI audio or not, I'll re-read the appropriate scrolls.
> 
> Well, if hardware didn't suck we wouldn't need quirks.
> 
> If you'd like, I can generate a second patch series that adds some or
> all of:
> 
> - NO_AUDIO quirk
> - drm_monitor_has_hdmi_audio() function

I've volunteered Antti from our team to implement this (and to patch up
drm/i915), so this should happen already and with the above no infoframes
quirks we shouldn't need any additional quirks.

Cheers, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch