Question regarding HDMI Audio support on i.MX6 with vanilla kernel

[Luís Mendes]

Hi,

On Tue, Nov 7, 2017 at 5:45 PM, Russell King - ARM Linux <
linux at armlinux.org.uk> wrote:

> Hi,
>
> On Tue, Nov 07, 2017 at 05:20:04PM +0000, Luís Mendes wrote:
> > I got no EDID at all from the monitor.
> > get-edid returns:
> > No EDID on bus 0
> > No EDID on bus 1
> > No EDID on bus 2
> >
> > hexdump -C /sys/class/drm/card1-HDMI-A-1/edid
> > is empty
>
> Can you confirm that it also gives no EDID when plugged into another
> machine?  I don't see evidence via google that other people have a
> problem with the monitor - and in this day and age, a monitor missing
> all EDID is just completely perverse, especially if it has a HDMI
> socket.  (EDID is basically a requirement for HDMI, it isn't optional.)
>
> You are right... the monitor does have EDID. I've just connected it to my
laptop. Binary in attachment, parsed edid below.


> I wonder if your board is missing something - maybe the 5V supply to
> the HDMI socket is missing (which is a requirement in the HDMI spec
> for the DDC bus to be usable.)
>

Yes, it looks like there is something with the board. Although my home TVs
now work since I changed to i2c2.

>
> --
> RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 8.8Mbps down 630kbps
> up
> According to speedtest.net: 8.21Mbps down 510kbps up
>

parse-edid < samsung_edid.bin
Checksum Correct

Section "Monitor"
    Identifier "SyncMaster"
    ModelName "SyncMaster"
    VendorName "SAM"
    # Monitor Manufactured week 41 of 2010
    # EDID version 1.3
    # Digital Display
    DisplaySize 160 90
    Gamma 2.20
    Option "DPMS" "true"
    Horizsync 27-81
    VertRefresh 50-60
    # Maximum pixel clock is 170MHz
    #Not giving standard mode: 1600x1200, 60Hz
    #Not giving standard mode: 1280x1024, 60Hz
    #Not giving standard mode: 1280x960, 60Hz
    #Not giving standard mode: 1280x800, 60Hz
    #Not giving standard mode: 1440x900, 60Hz
    #Not giving standard mode: 1680x1050, 60Hz

    #Extension block found. Parsing...
    Modeline     "Mode 10" 74.25 1920 2448 2492 2640 540 542 547 562 +hsync
+vsync interlace
    Modeline     "Mode 0" 148.50 1920 2008 2052 2200 1080 1084 1089 1125
+hsync +vsync
    Modeline     "Mode 1" 74.25 1280 1390 1430 1650 720 725 730 750 +hsync
+vsync
    Modeline     "Mode 2" 148.500 1920 2008 2052 2200 1080 1084 1089 1125
+hsync +vsync
    Modeline     "Mode 3" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync
+vsync
    Modeline     "Mode 4" 148.500 1920 2448 2492 2640 1080 1084 1089 1125
+hsync +vsync
    Modeline     "Mode 5" 74.250 1920 2008 2052 2200 1080 1082 1087 1125
+hsync +vsync interlace
    Modeline     "Mode 6" 74.250 1920 2448 2492 2640 1080 1082 1089 1125
+hsync +vsync interlace
    Modeline     "Mode 7" 74.250 1280 1720 1760 1980 720 725 730 750 +hsync
+vsync
    Modeline     "Mode 8" 27.027 720 736 798 858 480 489 495 525 -hsync
-vsync
    Modeline     "Mode 9" 27.000 720 732 796 864 576 581 586 625 -hsync
-vsync
    Modeline     "Mode 11" 74.25 1920 2008 2052 2200 540 542 547 562 +hsync
+vsync interlace
    Modeline     "Mode 12" 74.25 1280 1720 1760 1980 720 725 730 750 +hsync
+vsync
    Modeline     "Mode 13" 74.25 1280 1390 1430 1650 720 725 730 750 +hsync
+vsync
    Option "PreferredMode" "Mode 10"
EndSection

Luís
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