> On Sep 1, 2021, at 15:17 , Warren Kumari <war...@kumari.net> wrote:
>
>
>
> On Wed, Sep 1, 2021 at 2:28 PM <b...@theworld.com <mailto:b...@theworld.com>>
> wrote:
>
> Every time I've read a thread about using TVs for monitors several
> people who'd tried would say don't do it.
>
> And everytime I see an email thread about the difference or not between
> monitors and TVs I'm taken over by an all consuming rage...
> I have a **monitor**.... I purchased it from Dell, and it clearly said
> "monitor" on the box, it identifies itself somewhere display settings as a
> "monitor", and even says "monitor" in small letters somewhere on the back....
> It's a MONITOR dagnabit... but, for some unfathomable reason it has some tiny
> little speakers in it, and every time I connect it via HDMI to my Mac laptop,
> the machine decides to completely ignore the fact that I've told it that I
> want to use a specific sound output, and starts playing all audio though the
> monitors speakers. Oh, and because this is HDMI, and Apple apparently follows
> the HDMI spec, the Mac volume controls won't work ("This device has no audio
> level control" or something...) and I have to go scrummaging around in some
> horrendous on-screen monitor menu to make it less obnoxiously loud...
Yes, it’s not clear why Apple doesn’t implement more of the HDMI spec and send
it CEC commands to control the volume when it’s connected to an HDMI device
with sound output.
Interestingly, my Apple TV does implement that part of the spec and my Amp that
it is connected to dutifully obeys and everything works as expected… Display on
the monitor (TV if you prefer), sound from the 7.1 speakers through the amp as
expected, and control of the playback through the Apple TV all from the single
elegant Apple TV Remote. So clearly, Apple has mastered the skills necessary to
make this possible. Why they don’t bring them to MacOS yet remains a mystery to
me.
> All attempts to get this less stupid result in Apple pointing at the HDMI
> spec and saying that if a device advertises audio capabilites they list it as
> an output device, and Dell pointing out that they simply advirtise the fact
> that the device has a speaker, and, well, shrug, not thier issue if things
> try and use it.
Listing it as an output device doesn’t require them to auto switch to that
output device upon connection… You might want to point out to Apple that an
ability to override this less than desirable behavior would be sufficient to
cure your issue without violating the HDMI spec.
It pains me to say this, but Dell is right. The HDMI spec doesn’t allow for
them to have a (useful) implementation of a speaker (or speakers) in an HDMI
monitor that can some how say “I have a speaker, but don’t use it unless the
user specifically tells you to.”. OTOH, Dell could (and I’ve seen monitors and
even televisions that do) add a user control to “Disable HDMI audio
negotiations” or something to that effect.
> There used to be a good webpage that had some instructions along the lines of:
> Step 1: Open
> /System/Library/Extensions/AMDRadeonX6000HWServices.kext/Contents/PlugIns/AMDRadeonX6300HWLibs.kext
> in a hex editor
> Step 2: Change the byte at offset 931 to 0xED, offset 12323 to 0xFD, offset
> 94 to 0x00 and offset 42 to 0x03.
> Step 3: ???
> Step 4: The HDMI capabilities parser no longer understands the audio
> capability message, and so the Mac will never try to use HDMI audio ever
> again.... well, until you upgrade... oh, this is perfectly safe, trust us,
> nothing could possibly go wrong here...
>
> Unfortunately this was only for a specific version of a specific kext on a
> specific model of Macbook, but it did work...
I suppose, if you’re willing to never have the ability to use HDMI Audio Output
from your laptop (which wouldn’t work well for me).
I will say that it’s annoying to have to do it each time you connect to the
monitor, but it is relatively trivial to change the audio output back after the
monitor and laptop finish their whole HDMI negotiation and the various auto
switches have finished screwing up your system settings.
System Preferences->Audio->Output — Select the output you want instead of the
HDMI monitor.
> All I want is to be able to reliably inform my computer that the thingie on
> my desk is "just" a monitor and not a TV/HiFi system/similar... is that too
> much to ask!?!!?!!?!??!! <sob>
I’m reminded of a certain advertising slogan…
“Dude! You got [stuck with] a Dell.”
> (Actually, this used to annoy me enough that I purchased one of bunnie
> Huang's NeTV (https://www.bunniestudios.com/blog/?cat=17
> <https://www.bunniestudios.com/blog/?cat=17>) devices, which allows taking in
> HDMI, munging it and sending it out (e.g to do text overlays). My plan was to
> repurpose it as a straight data passthrough, but overriding the HDMI profile
> info, but as with most of these sorts of projects I got sidetracked into
> playing with the build environment instead, and now the hardware is buried
> under a pile of other abandoned projects somewhere on my workbench)
I can’t relate to this one bit… Nope, not at all…
> Thank you all, I feel much better now...
Glad we could collectively help.
Owen
>
