[Regression] Raspberry Pi 3 HDMI output broken after upgrade to 9.2.x

schMA · June 11, 2020 at 12:40 AM

Platform: Raspberry Pi 3 Model B Rev 1.2

Since the upgrade from LibreELEC 9.0.2 to LibreELEC 9.2.3 HDMI output is no longer working properly in combination with my Panasonic PT-AT5000E projector. It worked nicely for the last couple of years but since the upgrade to LibreELEC 9.2.3 I can only see the LibreELEC boot logo, the moment Kodi starts up I'm losing the HDMI signal.

To rule out any upgrade issues I flashed a new and fresh LibreELEC 9.2.3 to another SD card and booted that. HDMI output is working, Kodi boots up in 1080i - the moment I switch to 1080p my projects looses the HDMI signal again.

I did a bit of debugging and it looks like something's broking with the Raspberry Pi itself - maybe due to newer firmware? But decide for yourself:

LibreELEC 9.0.2

Code

# tvservice -m CEA
Group CEA has 15 modes:
           mode 1: 640x480 @ 60Hz 4:3, clock:25MHz progressive 
           mode 2: 720x480 @ 60Hz 4:3, clock:27MHz progressive 
           mode 3: 720x480 @ 60Hz 16:9, clock:27MHz progressive 
           mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive 3D:FP|TopBot
  (prefer) mode 5: 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced 3D:SbS-HH
           mode 10: 720x480 @ 60Hz 4:3, clock:54MHz x4 interlaced 
           mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive 
           mode 17: 720x576 @ 50Hz 4:3, clock:27MHz progressive 
           mode 18: 720x576 @ 50Hz 16:9, clock:27MHz progressive 
           mode 19: 1280x720 @ 50Hz 16:9, clock:74MHz progressive 3D:FP|TopBot
           mode 20: 1920x1080 @ 50Hz 16:9, clock:74MHz interlaced 3D:SbS-HH
           mode 24: 720x288 @ 50Hz 16:9, clock:27MHz x2 progressive 
           mode 31: 1920x1080 @ 50Hz 16:9, clock:148MHz progressive 
           mode 32: 1920x1080 @ 24Hz 16:9, clock:74MHz progressive 3D:FP|TopBot
           mode 45: 720x576 @ 100Hz 16:9, clock:54MHz x2 interlaced 

# tvservice -m DMT
Group DMT has 1 modes:
           mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive 

# tvservice -s
state 0x12000a [HDMI CEA (16) RGB lim 16:9], 1920x1080 @ 60.00Hz, progressive

Display More

That shows normal operation with Kodi running just as it should.

LibreELEC 9.2.3

Code

# tvservice -m CEA
Group CEA has 19 modes:
           mode 1: 640x480 @ 60Hz 4:3, clock:25MHz progressive 
           mode 2: 720x480 @ 60Hz 4:3, clock:27MHz progressive 
           mode 3: 720x480 @ 60Hz 16:9, clock:27MHz progressive 
           mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive 3D:FP|TopBot
  (prefer) mode 5: 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced 3D:SbS-HH
           mode 10: 720x480 @ 60Hz 4:3, clock:54MHz x4 interlaced 
           mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive 
           mode 17: 720x576 @ 50Hz 4:3, clock:27MHz progressive 
           mode 18: 720x576 @ 50Hz 16:9, clock:27MHz progressive 
           mode 19: 1280x720 @ 50Hz 16:9, clock:74MHz progressive 3D:FP|TopBot
           mode 20: 1920x1080 @ 50Hz 16:9, clock:74MHz interlaced 3D:SbS-HH
           mode 24: 720x288 @ 50Hz 16:9, clock:27MHz x2 progressive 
           mode 31: 1920x1080 @ 50Hz 16:9, clock:148MHz progressive 
           mode 32: 1920x1080 @ 24Hz 16:9, clock:74MHz progressive 3D:FP|TopBot
           mode 45: 720x576 @ 100Hz 16:9, clock:54MHz x2 interlaced 
           mode 74: 1920x1080 @ 30Hz 64:27 (21:9), clock:74MHz progressive 
           mode 110: 0x0 @ 0Hz 16:9, clock:0MHz progressive 
           mode 111: 0x0 @ 0Hz 16:9, clock:0MHz progressive 
           mode 115: 0x0 @ 0Hz 16:9, clock:0MHz progressive 

# tvservice -m DMT
Group DMT has 1 modes:
           mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive

# tvservice -s
state 0xa [HDMI CEA (5) RGB lim 16:9], 1920x1080 @ 60.00Hz, interlaced

Display More

That's a fresh LibreELEC installation, right after boot. No setting has been changed so far.

After switching to 1080p (and loosing the HDMI signal) it looks like this:

Code

# tvservice -s
state 0xa [HDMI CEA (115) RGB lim 16:9]

HDMI CEA mode 115 seems to be 2160p48 - I'm 100% sure my projector does not support that mode. On LibreELEC 9.0.2 it's not present.

I enabled Kodi debug logging and uploaded the relevant files/information:

Code

# paste /storage/.kodi/temp/kodi.log
http://ix.io/2oRr

# dmesg | paste
http://ix.io/2oRt

I do have a EDID dump (taken with tvservice --dumpedid edid.bin) in case you need it.

**HiassofT** · June 11, 2020 at 9:15 AM

Could you upload your edid? eg put it in a ZIP and attach it here.

so long,

Hias

schMA · June 11, 2020 at 9:40 AM

Sure, here we go

**HiassofT** · June 11, 2020 at 10:39 PM

Thanks for the edid file, I could reproduce the issue with it.

It looks like your projector has a broken edid, edid-decode throws up a lot of "Unknown tag 0" errors and a "Broken CTA audio block length 13" error.

RPi firmwares up to a year ago (Jun 10 2019 to be more specific) coped better with it, but later firmwares trip over that. I've flagged that to the RPi devs.

so long,

Hias

schMA · June 14, 2020 at 10:25 PM

WOW, thanks for the super quick analysis, awsome!

Just let me know if there's something I can test on my end. Unfortunately there's no firmware update (or the like) available for the projector

Will simply stay on 9.0 for now.

**HiassofT** · June 15, 2020 at 12:00 AM

Staying on 9.0 is probably the easiest solution for now.

Another possibility would be fixing the edid, if you add hdmi_edid_file=1 to config.txt the RPi will read edid.dat from the /flash partition. Unfortunately I can't help much with fixing the edid, I'm not really familiar with the edid editor programs.

Anyways, we'll keep you posted if we got something to test!

so long,

Hias

**HiassofT** · June 16, 2020 at 12:42 PM

RPi engineer 6by9 had a go at your edid file and manually fixed it.

Can you test if it works?

Just extract the ZIP, store panasonic-pt-ae5000e_edited.bin as edid.dat on the flash partition and set hdmi_edid_file=1 in config.txt.

so long,

Hias

schMA · June 18, 2020 at 11:13 PM

You guys are awesome!

Just activated the patched EDID file, works like a charm. 1080p@24 1080p@50 1080p@60 720p@50 720p@60 all seem to work just fine.

I tested with a fresh 9.2.3 as well as with my original installation (now upgraded to 9.2.3 again), looks very good.

I even gave 3D (1080p frame packing) a quick (!) go, seems to work. Kodi uses (half?-)side-by-side now by default (but my Raspi 3 is not really fast enough for that) but after manually switching to top-bottom it looks good.

Shout-out to 6by9 for fixing the EDID information!