Posts by smp

What's the point? YCbCr 4:4:4 is the same as RGB

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 821411b..557bd91 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2423,7 +2423,7 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder,
     if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
         return -EINVAL;
 
-    pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
+    pipe_config->output_format = INTEL_OUTPUT_FORMAT_YCBCR444;
     pipe_config->has_hdmi_sink = intel_has_hdmi_sink(intel_hdmi,
                              conn_state);

Yes, but 4:2:0 is still only at 8-bit.

From JVC NX5 manual:

When the color space is RGB/YCbCr(4:4:4), only 8-bit input is supported.

^ There's your answer. You will have to use 8-bit for 4k/24Hz.

systemctl stop kodi

./proptest -M i915 -D /dev/dri/card0 308 connector 314 8

systemctl start kodi

try if 4K/24 now works

Upd: the manual actually refers to 4K 50/60Hz modes, so deep color should be supported with 4K/24. Try also 10-bit (./proptest -M i915 -D /dev/dri/card0 308 connector 314 10)

Quote from Noumenon

It seems that 4k23.98hz files won’t output video.

My best guess is that your projector does not like the 4K RGB 12-bit mode.

Try to reduce it to 10-bit. You can do that with libdrm proptest tool.

Copy proptest to /storage, then

chmod 755 proptest

./proptest

and post the output here

Quote from Noumenon

24hz 4:2:2 is supported though?

No. RGB 12-bit.

Quote from Noumenon

RGB 8bit,

On Intel hardware 4K 50/60Hz HDMI video modes will always be RGB 8-bit because Intel driver does not support YCbCr 4:2:2. Some type of dithering would be required.

Quote from Noumenon

the colorimetry is labelled sRGB instead of bt2020

Wrong colorimetry issue was discussed a few posts back. BT.2020 works with this unmerged PR. It will not be included in Kodi 20/LE 11.

This is needed for BT2020. It's not merged yet.

It should work. Try older nightlies, maybe something is broken for Jasper Lake in current Mesa 3D.

If you are able to compile your own LE image - TBS5922 driver should be rather trivial to port from TBS repo.

TBS5922 driver (initial commit)

av201x tuner (initial commit)

tas2101 demod (initial commit)

Quote from michael123

do you reckon this one will work?

I doubt it has an HDMI 2.0 chipset. Also, in the description it says:

"5.184 or 8.64 Gbit/s forward link channel supports high resolution displays with a single cable."

Quote from michael123

I presume I'd still get 4k/HDR

You will have to use an active DP to HDMI 2.0 converter.

Yes

Add i915.force_probe=56a1 to syslinux.cfg

This issue has nothing to do with the colorspace. AMD driver doesn't even allow setting the specific colorspace via drm properties.

Quote

The Colorspace property is only exposed on intel hardware and vc4 (RPi4).

Quote from atoulmin

This may fix the problem?

No. That commit was always included in my builds.

Quote from chcore

Deinterlacing does not work/cannot be enabled when DRM PRIME is enabled

It looks like the developer who was working on it ( Kwiboo) hasn't been active for almost 2 years. See his comment from 2019.

HDR is partially working without DRM PRIME. It seem to be limited to HEVC 24p videos. In fact, this limited HDR functionality now present in current Kodi master/LE nightly.

Quote from chcore

but my LG G1 never switched to HDR mode

Does it switch to HDR with my LE build?