popcornmix HiassofT just keeping you both informed....
Been running on the Matrix 19.3 build on one of my Pi's and it has been great. No black screens during boot and fast and responsive boot and transitions when changing resolutions and refresh rates. It just works.
Reboots have also been working well.
If that changes I'll post back but so far it remains good.
I have been running on the Matrix build, testing many times with reboots and fully powering off, via the Kodi shutdown menu and finally by switching the power off to the Pi when all activity stops. Then powering the Pi back up.
It has never made a black no signal screen yet.
I will keep using that build, but so far it has been fine. The boot process is quick and smooth.
Apart from what I have been asked to include in the config file it is vanilla. This problem occurred even with a vanilla config file. No difference there.
Both the TV shows and Movie libraries are populated but as the blank screen starts just after the coloured square PI screen it doesn't suggest it gets far into the boot process of Kodi.
I will keep testing.
Yes I will do that. I just wanted to confirm if the changes to the port made a difference.
When I move over to the other Pi with the build noted by HiassofT do you want me to add the command (drm.debug=0x04 ) to the cmdline.txt file and post the contents gained from it for you, if it happens.?
Am I right in thinking that you are running at 1080p me not 4k.?
When I switch to HDMI 3 it is at 4k. Part of that boot process seems to make changes before it gets to the Kodi desktop at 1080p 60Hz.
You have not asked for it but here are the contents of that file from a SUCCESSFUL boot with the Matrix build linked previously. It does boot "smoother" and straight to the Kodi UI, much more responsively than the nightly build.................
if and when I get any failings to boot I will try and post that also, provided I can still SSH to the Pi.
Thanks
Well I had hoped that things were working ok after the change to "enhanced" HDMI port. But this morning I booted the Pi (nightly build) and it did the coloured splash and then a flash to the Libreelec boot screen before it seemed to try and change resolution (?) but then vanish to a black screen. It did this several times on each power off and on attempt to boot it. Eventually booting ok to a Kodi screen.
This can happen using either of the Raspberry Pi 4B's shown in the photo in post #4
HiassofT Ok will do...
This is my setup with two Rasp Pi's ver 4B rev 1.4....
I might have something that could be interesting BUT more testing is required. Since I have changed my HDMI port to "Enhanced" (see photo above in post #19) the Nightly Pi has been booting and rebooting without issue. It also has been switching resolution as needed very responsively, without pause.
When first booted, after the Pi coloured square splash screen, it now goes immediately to the Libreelec boot screen. EVEN if that worked before there was a delay before it did that, sometimes failing with an even longer black screen delay. No black screens noted as yet.
But I will keep testing, this time on the nightly build, as I feel that it could well be resolved due to the port being set to enhanced and support 4k at 60Hz. Not sure of the technical reasons as to why that could happen.
HiassofT in my simple way this is what I have.....One SD card with the latest nightly (like the HDR10 tags btw) and that is experiencing those long black pauses. I sometimes see shorter, but still there, pauses when it tries to change resolutions and refresh rates when playing a file that is different to the UI. That can be most noticeable.
I also have a second SD card with this version loaded......
LE 10.0.1 / Rpi4 / No picture after update from LE 10.0.0 - Page 3 - Bug Reports - LibreELEC Forum
see post #42 posted by you. Is it in that version you wish me to test for these black screen type pauses...?
Once booted (nightlies) it seems to be fine, apart from those sometimes noted resolution and refresh changes I mentioned.
So would you like me to test the one linked in this post, rather than carry on with the nightlies..?
HiassofT Thanks. If you go back to my original posts I didn't mention 4k @ 60Hz. I didn't think that was relevant to my initial concerns. All of my 4k content plays with a refresh rate less than 60Hz. But I thought that with you wanting me to add that line to the config file it might help with my black screen situation...?
I always run the GUI at 1080p at 60Hz. Seems the best all round experience, the video content will auto switch to what is needed and whitelisted.
Today, just as I was preparing to boot up into Kodi by switching on the Pi, it paused for a long time again during that boot, after the coloured square splash screen. This time I do not switch it off but go back into my other room and try and SSH into it. By the time I got the SSH app up and going I could do this and then put the new latest nightly into the update folder. I went back into the other room where the Pi and large TV are and the Kodi screen was there.
Perhaps, as you pointed out by you pinging the Pi Devs in regards to the bug within the video driver that is where the problem is.
BTW Since I changed my external inputs to the first attachment I now get 60Hz if ever needed in the Kodi settings, see second attachment.
Could you tell me if changes made to the config file remain after the Pi is updated by using the nightly updates OR would it be wiped clean..?
By the way I kept the two changes you suggested within the config file.
Long black pauses are still an issue.
Thanks
Da Flex No worries, understand. Thanks for the reply.
chewitt thanks for that. I now have both the original version of 10 build and then that one you linked wit hthe latest drivers etc.
Could you tell me how long it is before my posts can be directly sent to the forum without moderator approval, thanks.
Does anyone have a link for me to download and test 10 with please for the Raspberry Pi 4..? I can't seem to find the images for 10, just 10.0.01
I do seem to be having blank screen issues after the coloured square screen when booting and the latest nightlies.
I had been noting some of my issues here...
Raspberry 4, Libreelec 10.0.1, no picture after reboot - General Support - LibreELEC Forum
EDIT: never mind, didn't realise that I could just "show all" within the creator. I am now making a version 10 to test out.
Thanks
HiassofT FYI......
These photos are with an Amazon Fire TV Cube using the 19.3 version of Kodi and a bog std HDMI cable....
So I do know that the TV is capable of running at 4k with a 60Hz refresh rate and Kodi, using the hardware in the Cube.
Just for information purposes.
Thanks 
HiassofT Hopefully it might help to resolve that bug, thanks for pinging them.
I added that line and then rebooted. I don't think that it might have added that refresh rate as I see this....
See file "limited refresh rate available"
and also I ensured that the HDMI port is set to FULL range. The cable is ok for 60Hz and 4k.
I have whitelisted all available 4k modes, but 60Hz is not there.
I have seen an odd post or two where such issues of attaining 60Hz at 4k seems to happen, not sure if that is something I could resolve..?
As for how often............At times it seems to be pretty regular, say one in three boots. That is a power off at the system from within Kodi, wait until only a red light on the Pi and then use the power off toggle switch within the USB-C cable. Then leave for twenty seconds or so and then power on.
At other times I can do several of those cycles and it seems fine with no issues.
I do know that if watching Amazon or Netflix I get both Dolby Vision and HDR fine, as their logos and video info of what is playing states that is streaming.
Do you wish me to keep the drm.debug=0x04 there within that other file...?
Delay still occurring as my posts are needed to be moderated before they can be viewed.
just seen your other post and so added that line, it now reads....
# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2009-2014 Stephan Raue ([email protected])
# Copyright (C) 2016-present Team LibreELEC (https://libreelec.tv)
################################################################################
# Bootloader configuration
# config.txt version v1 (do not remove or change this line!)
################################################################################
# For more options and information see
################################################################################
# Default GPU memory split, 76MB are needed for H264 decoder
gpu_mem=76
# Don't send initial active source message.
# Avoids bringing CEC (enabled TV) out of standby and channel switch when
# rebooting.
hdmi_ignore_cec_init=1
################################################################################
# Include distribution specific config file if it exists.
################################################################################
[all]
include distroconfig.txt
# uncomment to enable infrared remote recevier connected to GPIO 18
#dtoverlay=gpio-ir,gpio_pin=18
hdmi_enable_4kp60=1
force_turbo=1
HiassofT You are welcome.
Took a few times before it would occur after adding that line. It does seem to have a very long pause on some boots, rather than not boot.
Here is that file....
the above was taken from the boot of Libreelec after it started from that long delay, via SSH.
BTW how many posts would it be before I get to post directly to the forum without the need of moderation.?
Thanks for what you have written, it might have had some clues to help me.
Rather than think that something is an issue, just because I see that message about there being no signal, I wait and it seems that it does boot to the Kodi desktop. Albeit sometimes it takes a while.....
I am now not thinking that there is a blank screen issue, in the same sense, just a delay that I was not allowing for during some boots.
BTW even tho I am subbed to this thread I do not get updated reminders by email.
Not sure why I don't get an email notification of a reply but.....
Ok I added the above the the update folder. The first issue, before it updated, is that the re-boot function isn't great. That often results in the Pi rebooting, coloured square screen showing, and then a black blank screen. No SSH is possible at that stage.
Powered off and on a couple of times and then it booted, and updated to the latest version as linked. Powered off for a while and then a blank screen after the initial coloured square splash. SSH shows this at this stage....Photo attached.
Video showing the attempted boot....
I have returned to using a Rasp Pi 4b and a the latest nightly build on LibreElec connected to my Sony 4K TV, directly. 60Hz refresh rate is not used.
I do not know how the non-nightly version would work.
As per OP now and again I do get a blank screen on trying to boot the PI. The TV is already on and turned to the right HDMI connection. I do get the square coloured screen of the Pi initiating and then blank, only now and again. When I do get a Kodi screen all is well.
when it next does this I will try and SSH into it. I can SSH to it when it boots fine, I use that to update to the latest nightly.
If you could tell me, can't seem to find it by searching, how to retrieve the dmseg file, assuming I could do this from SSH and if it works with a blank screen.....Would it be....
Open Terminal and type....... dmesg | Paste
and then return the URL that is provided..?
Not that it might matter but I have briefly tested OSMC before I used the nightly Libreelec, and that seemed fine. But only several boots were done when testing that, using their full release and not the test one.
