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@xxxxxxxxx>
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
- NO_AUDIO quirk for LG L246WP (kind of redundant if no InfoFrames are
being sent anyway, but still technically accurate)
Let me know if you'd like any or all of those.
Thanks!
--
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Ian Pilcher arequipeno@xxxxxxxxx
"If you're going to shift my paradigm ... at least buy me dinner first."
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