A fix for the kernel on the horizon?
Wasn't this fixed in 9.2.2 ?
Posts by smp
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Wouldn't in case of bad cable NIC connect at 100Mbps or show some errors/dropped frames?
In your case it looks like it does connect at 100M but for some reason reports 1000M.
I would test it with a short, known good cable before pulling out any cables from the wall
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I have the same motherboard with the same Realtek chip. No issues here:
Display MoreCode- Connecting to host 192.168.88.199, port 5201
- [ 5] local 192.168.88.7 port 43690 connected to 192.168.88.199 port 5201
- [ ID] Interval Transfer Bitrate Retr Cwnd
- [ 5] 0.00-1.00 sec 114 MBytes 954 Mbits/sec 0 404 KBytes
- [ 5] 1.00-2.00 sec 113 MBytes 945 Mbits/sec 0 424 KBytes
- [ 5] 2.00-3.00 sec 113 MBytes 945 Mbits/sec 0 540 KBytes
- [ 5] 3.00-4.00 sec 111 MBytes 935 Mbits/sec 14 460 KBytes
- [ 5] 4.00-5.00 sec 112 MBytes 941 Mbits/sec 0 509 KBytes
- [ 5] 5.00-6.00 sec 112 MBytes 941 Mbits/sec 0 530 KBytes
- [ 5] 6.00-7.00 sec 112 MBytes 942 Mbits/sec 0 570 KBytes
- [ 5] 7.00-8.00 sec 112 MBytes 941 Mbits/sec 0 594 KBytes
- [ 5] 8.00-9.00 sec 112 MBytes 940 Mbits/sec 0 595 KBytes
- [ 5] 9.00-10.00 sec 113 MBytes 944 Mbits/sec 0 602 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - - -
- [ ID] Interval Transfer Bitrate Retr
- [ 5] 0.00-10.00 sec 1.10 GBytes 943 Mbits/sec 14 sender
- [ 5] 0.00-10.00 sec 1.10 GBytes 941 Mbits/sec receiver
Try to test with another cable. At Gigabit speed Realtek NICs are very picky with ethernet cables. I've seen some short cat5e cables that work fine at 100M but fail at 1000M.
I'm using Cat6 7.5m cable.
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On a Pi3 it was possible to improve this by messing around with "vcgencmd arbiter set arm_uc" command, e.g.:
# vcgencmd arbiter status
# vcgencmd arbiter set arm_uc 12 0
No idea it this is still valid for Pi4.
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I think LibreELEC-Generic.x86_64-9.80-devel-20200201013402-e776789.img.gz contain a limit to use 8-bit output and if I remember correctly using 4:2:0 50/60hz 8-bit works
Nope, 8-bit does not work too. I actually have to use only 8-bit because of the above mentioned issues with Samsung TVs.
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Did you do that?
I only have J4105 and I saw no issues with 4K/60 (non-HDR).
The experimental HDR build is too early to make any conclusions.
4K/24Hz HDR mode works fine but 4K/60Hz HDR mode does not work properly:
Maybe devs know something regarding this issue. Kwiboo ?
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I see no reason why the number of EUs would affect the video playback. It can only make a difference when rendering Kodi GUI.
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Asking because in this test (Intel NUC7CJYH im Test mit LibreELEC und unter Windows 10) which is running on Kodi in WIndows, the test file did run perfectly on the J5005, but not on the 4005
That same test also says:
QuoteUnder LibreELEC all of our test files run smoothly
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I need to get hold of version 8.2.5 for Le Potato.
There is no 8.2.5 for Le Potato.
And yes, 9.0.2 is buggy and unusable on Le Potato - live TV issues and also file transfer issues due to this buggy patch.
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I figured out how to force YCbCr 4:4:4 instead of RGB:
Display MoreDiff- diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
- index 93ac0f2..6336b4b 100644
- --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
- +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
- @@ -2418,7 +2418,7 @@ 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 = !force_dvi && intel_hdmi->has_hdmi_sink;
- if (pipe_config->has_hdmi_sink)
Unfortunately this did not fix the Samsung issue. 4K YCbCr 4:4:4 8-bit works fine but "no signal" with 12-bit.
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That's not correct.
Yeah, it is indeed in the specs. But still the only useful 4:2:0 modes are 8-bit (for displays that don't support > 9Gbps link speed).
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Since GLK does not support 10bit modes, does that mean the signal being sent was 12bit?
No, the signal was 8-bit. Despite the popular opinion HDR does not really require 10/12 bit and the TV will switch to HDR/ST.2084 mode when HDR metadata is present.
I wasnt sure how to get more info from the j4105 about what display mode is being used.
Enable DRM debug logging in syslinux.cfg:
Then
journalctl -f | grep -E 'color|bpc'
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4K 4:2:0 with Deep color is not a part of HDMI spec. It should always be 8-bit.
No idea how to force YCbCr 4:4:4. Intel driver knows what's best for you and use RGB.
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From memory, to get it working I booted the j4105 with the TV in UHD mode, got the available UHD modelines via SSH, and then added them via a boot script and xrandr.
That will not give you the 12-bit Deep color modes in 4K (10-bit is not supported by GLK hardware). There is no difference how you force it to output the desired modes.
I also tried to mess around with editing the EDIDs dumped with both HDMI UHD Color On and Off to narrow down the issue.
Any 4K mode that requite the HDMI pixel clock higher than 297 Mhz give "no signal".
Intel driver does not support YCbCr 4:2:2 output. When the EDID report the max.pixel clock of 297 Mhz (UHD Color Off) - Intel driver is using those modes for 4K and they work fine:
4K 24/25/30Hz RGB 8-bit
4K 50/60Hz YCbCr 4:2:0 8-bit
When the EDID report the "high speed" pixel clock mode (594 Mhz) is available - Intel driver is using those modes (and they give no signal):
4K 24/25/30Hz RGB 12-bit
4K 50/60Hz RGB 8-bit
IMO the issue has something to do with Samsung having limited support for 4K RGB modes. It probably expects YCbCr 4:2:2 which Intel does not support.
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I know still are some incompatibility example with Samsung HDR TV, which is actually issue of intel driver/
I tried to figure out what is causing that "no signal" issue on Samsung TV when "HDMI UHD color" is enabled.
At first I thought that Samsung does not support 4K RGB modes with Deep Color. But the odd thing is that when trying 4K 50/60 modes - Intel driver is switching to RGB 8-bit and it doesn't work as well.
So, the only 4K HDMI modes that work with GLK+Samsung TV are:
4K 24/25/30Hz RGB 8-bit
4K 50/60Hz YCbCr 4:2:0 8-bit
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It's a new Comet Lake CPU. No wonder LE 9.2.0 does not support it. Use the Milhouse nightly build.
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Use the keymap editor addon to remap the buttons.
