Posts by HiassofT

camelreef the important bits in the edid are that it contains support for YCbCr 4:2:2 support in the CTA extension block (pretty much any HDMI TV should support that):

Block 1, CTA-861 Extension Block:
  Revision: 3
  Underscans IT Video Formats by default
  Basic audio support
  Supports YCbCr 4:4:4
  Supports YCbCr 4:2:2

And for deep color (10/12bit RGB 4:4:4) the DC_30bit and/or DC_36bit bits should be contained in the HDMI vendor block:

  Vendor-Specific Data Block (HDMI), OUI 00-0C-03:
    Source physical address: 4.0.0.0
    Supports_AI
    DC_36bit
    DC_30bit
    DC_Y444

In addition to that the edid also should contain an HDMI Forum vendor block which announces support for TMDS rates up to 600MHz to get RGB 4:4:4 at 4kp30 with 10/12 bit or YCbCr 4:2:2 12bit at 4kp60 - at 300MHz TMDS rate the max is 1920x1080p30 at YCbCr 4:2:2. eg:

  Vendor-Specific Data Block (HDMI Forum), OUI C4-5D-D8:
    Version: 1
    Maximum TMDS Character Rate: 600 MHz
    SCDC Present

so long,

Hias

Yes, we tested it, and I missed that deinterlace is broken - just noticed it now We're already working on it.

To verify output mode you could check if your TV/display has some kind of diagnostics / info menu. My LG C8 is unfortunately a bit too old and only tells me resolution and refresh rate - newer models should also report color format and bit depth.

popcornmix checked with his HDMI analyzer and we both checked dmesg - with drm.debug=0x02 you'll see the mode and bit depth buried in tons of other logs, eg

[   73.507849] vc4-drm gpu: [drm:vc4_hdmi_encoder_atomic_check] Mode 3840x2160 @ 60Hz: Found configuration: bpc: 12, fmt: YUV 4:2:2, clock: 593407000

or

[  152.031004] vc4-drm gpu: [drm:vc4_hdmi_encoder_atomic_check] Mode 3840x2160 @ 24Hz: Found configuration: bpc: 12, fmt: RGB, clock: 445054500

so long,

Hias

If you are in the mood for some experimental testing here's a first LE11 testbuild with 10/12bit output support

https://www.horus.com/~hias/tmp/libreelec/LibreELEC-RPi4.arm-11.0-devel-20211216212118-cdca5e3.tar

If you play a 10bit video file the video driver should select the best mode supported by the display: RGB 12bit is preferred, then YCbCr 4:2:2 12bit, then RGB 10bit and if none of that is supported by the display RGB 8bit is used (as before).

Note: this is a LE11 testbuild with kodi Nexus so better install it on a separate SD card if you're running LE10 and don't want to trash that installation.

so long,

Hias

Update to LE 9.2.x or see here if you wish to stay on 9.0.x: RE: Cannot Install/Update Addons

so long,

Hias

FYI: there's no need to unsquash/update/squash SYSTEM to add/update wifi firmware, simply drop it in /storage/.config/firmware/brcm (you need to create that directory first) and reboot

so long,

Hias

yullaw thanks a lot, this is very interesting. So it seems your TV doesn't like the initial "handover" from firmware to linux graphics driver if the resolution isn't changed.

I hope this observation will help RPi engineers to find a solution, maybe there's some timing related issue (random guess).

so long,

Hias

You can fix it by booting from SD, either with LE or the eeprom recovery image.

so long,

Hias

Are you booting from USB or network? If yes, then ENABLE_SELF_UPDATE=0 will surely prevent updating, it needs to be set to 1.

so long,

Hias

The patch was included in the 5.10.80 kernel about 2 weeks ago and should be in the next LE release (nightly builds should already have it for some time).

so long,

Hias

Tim was quick, we already got a fix, PR with rpi-eeprom update is here https://github.com/LibreELEC/LibreELEC.tv/pull/5936 and should be in nightly builds soon.

so long,

Hias

I could reproduce the issue and opened a bug report here https://github.com/raspberrypi/rpi-eeprom/issues/383

so long,

Hias

This seems to be a bug introduced by the recent rpi-eeprom package update. I'll have a look.

so long,

Hias

Puschl the kernel update with the spidev fix is in today's nightly build https://test.libreelec.tv/LibreELEC-RPi4…130-26827ca.tar - can you give it a try?

so long,

Hias

Thanks for the report! I Just PR'ed a kernel update which should be included in nightly builds soon. https://github.com/LibreELEC/LibreELEC.tv/pull/5930

so long,

Hias

Quote from twilightened

Is there a key combination that will allow me to select the boot source on Raspberry Pi 4 while booting? Let's say i want to boot the usb stick when the sd card is inserted. Is it possible to do so?

No, you can only configure the boot priority/order.

so long,

Hias

Quote from camelreef

I'm guessing that it will be on the next nightly, as nightly-20211127-e3a7c06 still gives me the white lines.

I'll eagerly wait, test and report back!

Yes, exactly. It's Nov 28 here and the builds will start in a few hours, so nightly-20211128-... will have it. Timezones can be a bit confusing in international communications, so I better should have used the term "next"

so long,

Hias

We've added a fix for the "white line" artefacts https://github.com/LibreELEC/LibreELEC.tv/pull/5925 which will be in today's nightly builds.

Testing here on RPi4 looked good so far, more feedback is always welcome

so long,

Hias

You have to use the first HDMI port (labelled HDMI0 on RPi4 PCB, HDMI-A-1 in linux), the second port supports CEC, too, but libcec (which is used by kodi) doesn't support it, it's hardwired to the first one without a possibility to change that...

so long,

Hias