How to force YUV 4:4:4 on Intel x64 generic ?

atoulmin · April 11, 2024 at 3:28 AM

Quote from sky42

portapro I made a quick rebuild of my last community version with the force YCbCr 4:4:4 patch.

download image here https://sky42.libreelec.tv/testing/intel-yuv444/

here is the full source https://github.com/sky42src/Libre…-240324y-yuv444

this commit you can pick for your own build if it works for you https://github.com/sky42src/Libre…7d8a8158956b078

Edit:
Short test on my N100 -> X6700H -> OLED55E6D show it does what it is suposed to do. All is in YCbCr 4:4:4 says the info screen of my Denon with or without HDR10.
You may run into audio trouble when playing 2160p @ 23.976 Hz and using pass through.
quick workaround is to only use 10 bit not 12
systemctl stop kodi && intel-gpu-max-10-bit.sh && systemctl start kodi

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This works perfect, i have to use the 10-bit option otherwise i get dropouts.

However i noticed that the video output refresh rate is 23.95, not 23.976 which creates stutters. Any ideas?

**chewitt** · April 11, 2024 at 10:11 AM

Kodi rounds values in GUI/logs and often reports 23.98 when the actual rate is 23.976. So if you're seeing 23.98 all is fine. If you're truly seeing 23.95 then something is wrong.

atoulmin · April 12, 2024 at 12:58 AM

Yeah it was 23.95, and my lumagen reported that as well. I ended up using a new build and applying the 10bit patch to it. All fine now.

hugosboss · December 2, 2025 at 7:34 PM

how does one need to change the projects/Generic/devices/Generic/patches/linux/linux-100.01-force-yuv.patch

so it will still work?

I want to use a newer version then 11.95 because of the LFE audio support (i have a capable 2.0 system)

Display Spoiler

Code

ake[1]: Leaving directory '/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/build/libcap-2.77/.x86_64-linux-gnu/libcap'
>>> libcap:host seq 26 >>>
[020/326] [DONE] build   libcap:host
[021/326] [DONE] build   pigz:host
<<< pigz:host seq 27 <<<
GET      pigz (archive)
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
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 85  118k   85  101k    0     0  66845      0  0:00:01  0:00:01 --:--:-- 66815
100  118k  100  118k    0     0  78068      0  0:00:01  0:00:01 --:--:-- 78059
    INFO      Calculated checksum: eb872b4f0e1f0ebe59c9f7bd8c506c4204893ba6a8492de31df416f0d5170fd0
UNPACK      pigz
BUILD      pigz (host)
    TOOLCHAIN      manual
make[1]: Entering directory '/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/build/pigz-2.8'
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -I/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/include  -c -o pigz.o pigz.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -I/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/include  -c -o yarn.o yarn.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/hash.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/cache.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/util.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/lz77.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/tree.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/katajainen.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/symbols.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/squeeze.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/blocksplitter.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -c zopfli/src/zopfli/deflate.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -O3 -Wall -Wextra -Wno-unknown-pragmas -Wcast-qual -I/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/include  -c -o try.o try.c
/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/bin/host-gcc -Wl,-rpath,/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/lib -L/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/toolchain/lib -o pigz pigz.o yarn.o try.o deflate.o blocksplitter.o tree.o lz77.o cache.o hash.o util.o squeeze.o katajainen.o symbols.o -lm -lpthread -lz
ln -f pigz unpigz
make[1]: Leaving directory '/home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/build/pigz-2.8'
>>> pigz:host seq 27 >>>
[022/326] [FAIL] build   linux:host

The following log for this failure is available:
  /home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/.threads/logs/25.log

<<< linux:host seq 25 <<<
GET      linux (archive)
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  1  146M    1 1950k    0     0  5316k      0  0:00:28 --:--:--  0:00:28 5315k
 13  146M   13 19.7M    0     0  14.4M      0  0:00:10  0:00:01  0:00:09 14.4M
 25  146M   25 37.8M    0     0  15.9M      0  0:00:09  0:00:02  0:00:07 15.9M
 38  146M   38 55.8M    0     0  16.5M      0  0:00:08  0:00:03  0:00:05 16.5M
 50  146M   50 73.8M    0     0  16.9M      0  0:00:08  0:00:04  0:00:04 16.9M
 62  146M   62 92.0M    0     0  17.1M      0  0:00:08  0:00:05  0:00:03 18.0M
 75  146M   75  109M    0     0  17.2M      0  0:00:08  0:00:06  0:00:02 18.0M
 86  146M   86  127M    0     0  17.2M      0  0:00:08  0:00:07  0:00:01 17.8M
 99  146M   99  145M    0     0  17.3M      0  0:00:08  0:00:08 --:--:-- 17.8M
100  146M  100  146M    0     0  17.3M      0  0:00:08  0:00:08 --:--:-- 17.8M
    INFO      Calculated checksum: 5a8de64a75fca706c01c6c0a77cf75a74618439db195e25f1f0268af6b2fb1da
GET      intel-ucode (archive)
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

100 14282    0 14282    0     0  20884      0 --:--:-- --:--:-- --:--:-- 20884
100 14.6M    0 14.6M    0     0  9279k      0 --:--:--  0:00:01 --:--:-- 15.7M
100 15.8M    0 15.8M    0     0  9629k      0 --:--:--  0:00:01 --:--:-- 15.8M
    INFO      Calculated checksum: 5a9a0d17240f486461bc101ef74f2b8c10675cdd02d0ba0bd6168b061c62e970
UNPACK      intel-ucode
UNPACK      linux
    APPLY PATCH (common - default)      packages/linux/patches/default/linux-062-imon_pad_ignore_diagonal.patch
patching file drivers/media/rc/imon.c
Hunk #1 succeeded at 1439 (offset 95 lines).
    APPLY PATCH (common - default)      packages/linux/patches/default/linux-999.02-0001-pm-disable-async-suspend-resume-by-default.patch
patching file kernel/power/main.c
Hunk #1 succeeded at 123 with fuzz 2 (offset 77 lines).
    APPLY PATCH (device)      projects/Generic/devices/Generic/patches/linux/linux-100.01-force-yuv.patch
patching file drivers/gpu/drm/i915/display/intel_hdmi.c
Hunk #1 succeeded at 2234 with fuzz 1 (offset 38 lines).
Hunk #2 FAILED at 2215.
Hunk #3 succeeded at 2333 (offset 86 lines).
1 out of 3 hunks FAILED -- saving rejects to file drivers/gpu/drm/i915/display/intel_hdmi.c.rej
*********** FAILED COMMAND ***********
patch -d "${PKG_BUILD}" -p1 < ${i} >&${VERBOSE_OUT}
**************************************
*********** FAILED COMMAND ***********
${SCRIPTS}/unpack "${PKG_NAME}" "${PARENT_PKG}"
**************************************
FAILURE: scripts/build linux:host has failed!

The following log for this failure is available:
  /home/user/LibreELEC.tv/build.LibreELEC-Generic.x86_64-13.0-devel/.threads/logs/25.log

>>> linux:host seq 25 >>>
Parallel build failure - see log for details. Time of failure: Tue Dec  2 20:18:00 CET 2025
make: *** [Makefile:10: image] Fehler 1

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I have no idea what I am doing + I have no idea what I am doing wrong

I was following this https://wiki.libreelec.tv/development/build-basics + nano projects/Generic/devices/Generic/patches/linux/linux-100.01-force-yuv.patch copy paste from https://github.com/sky42src/Libre…force-yuv.patch

**chewitt** · December 3, 2025 at 12:31 AM

The patch was authored for Linux 6.6.22 and the master branch currently targets Linux 6.17.8; so the kernel code the patch targets has changed and the patch cannot be applied.

hugosboss · December 6, 2025 at 11:27 AM

I tried for hours on no end to patch on 12.0

patch: **** malformed patch at line xyz: } is killing me

chatgpt is no help in this issue

Rant about Samugn TV

Samsung TVs are just annoying. The moment you connect something like a PC, the TV decides: “Oh, you’re using a computer? Then you definitely don’t want correct color profiles.”
Yes, Samsung. I actually do.

There’s supposed to be a fix. If you set the HDMI input to Cable Box, everything suddenly looks normal again. But it doesn’t last. As soon as something glitches, the TV updates, or the input is detected again, the settings reset and you have to redo the entire process.

my tried patch

Diff

--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2194,11 +2194,18 @@ intel_hdmi_sink_format(const struct intel_crtc_state *crtc_state,
        if (!crtc_state->has_hdmi_sink)
                return INTEL_OUTPUT_FORMAT_RGB;

-       if (connector->base.ycbcr_420_allowed && ycbcr_420_output)
-               return INTEL_OUTPUT_FORMAT_YCBCR420;
-       else
-               return INTEL_OUTPUT_FORMAT_RGB;
+       /* Prefer full YCbCr444 if supported */
+       if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444 ||
+           connector->ycbcr_444_allowed)
+               return INTEL_OUTPUT_FORMAT_YCBCR444;
+
+       /* Fallback to YCbCr420 if available */
+       if (connector->base.ycbcr_420_allowed && ycbcr_420_output)
+               return INTEL_OUTPUT_FORMAT_YCBCR420;
+
+       /* Otherwise: RGB */
+       return INTEL_OUTPUT_FORMAT_RGB;
 }

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I would really love it if someone could make a newer version of the Sky42 image.

**smp** · December 6, 2025 at 2:01 PM

git diff intel_hdmi.c.original intel_hdmi.c.edited > linux-force-yuv.patch

then edit the patch to fix the path to intel_hdmi.c (drivers/gpu/drm/i915/display/intel_hdmi.c)

**chewitt** · December 6, 2025 at 5:53 PM

If the sources are in a git tree edit the file with the changes then either commit the changes and run "git format-patch HEAD~1" or without committing do "git diff > linux-force-yuv.patch" .. either way gets you a diff patch with the correct paths.