LibreELEC v8.90.004 : no UI

sk4hrr · September 13, 2018 at 9:52 PM

Hello,

I recently bought an AREZ Radeon RX550 to test 4K and HDR2SDR, but kodi never lauched. With only fresh installs :

LibreELEC 8.2.5 : error message about Flexbox
LibreELEC 8.90.004 : LibreELEC splash screen displayed, system booted (see DLNA) but Kodi not launched
LibreELEC build #0912 : same as above

About my hardware :

MB : ASRock FM2A88M Extreme4+
CPU : AMD A6-6400K (3.9 GHz) Black Edition
GPU : AREZ Radeon RX550 (2GB)
TV : TV Panasonic TX-55CX700E UHD
HDMI : KabelDirekt HDMI 4K (2.0)

**blueribb** · September 13, 2018 at 10:05 PM

RX 550 - GPU not supported

sk4hrr · September 13, 2018 at 10:13 PM

Milhouse talks about build #0511, but I'm testing with #0912...

**blueribb** · September 13, 2018 at 10:50 PM

Then try build #0511 and contact Milhouse if you still have issues

sk4hrr · September 14, 2018 at 12:33 AM

In readme.md file is specified to open a post here...

**blueribb** · September 14, 2018 at 12:59 AM

Contact Milhouse

**mglae** · September 14, 2018 at 4:37 PM

Maybe the system is confuse by having both the RX 550 and the Radeon HD 8470D of the A6-6400K CPU.

To get more information you can remove the RX 550 card. Configure network and sshd in the recent Milhouse build and test the ssh access over network.

Insert the RX 550 again. After boot network access should be still possible. Please post the results of:

Code

dmesg|paste
journalctl|paste
paste /var/log/Xorg.0.log

sk4hrr · September 16, 2018 at 9:50 AM

Sorry for my late answer and thank you for yours.

LibreELEC 8.2.5: http://ix.io/1mmn | http://ix.io/1mmo | http://ix.io/1mmo
LibreELEC 8.90.004: http://ix.io/1mmx | http://ix.io/1mmy | http://ix.io/1mmz
LibreELEC build #0912: my bad, do when I will be to home

My BIOS is configured to boot on PCI graphic card : 1537087792.jpg

I did some tests on Debian and Ubuntu with XFCE:

Debian buster: need firmware-amd-graphics
Ubuntu 18.04.1: works at boot

On Ubuntu I tried with the drivers from the AMD website, but impossible to change resolution to UHD (black screen). Still on Ubuntu, with Kodi 18, I had the hardware decoding of the HEVC but no audio passthrough.

**mglae** · September 16, 2018 at 8:47 PM

The kernel of 8.2.5 is to old for RX550 support.

On 8.90.004 the kernel activates the radeon driver for HD 8470D and the amdgpu driver for the RX550. The system detects the radeon driver first and configures xorg for it.

Try:

Bash

sed '/DRIVER=="radeon"/d' </lib/udev/rules.d/97-xorg.rules >~/.config/udev.rules.d/97-xorg.rules

to remove radeon detection and reboot.

sk4hrr · September 16, 2018 at 10:18 PM

With your command: http://ix.io/1mpm

LibreELEC 8.2.5: thanks for your explanation
LibreELEC 8.90.004: http://ix.io/1mpn | http://ix.io/1mpo | http://ix.io/1mpp
LibreELEC build #0915: http://ix.io/1mpr | http://ix.io/1mps | http://ix.io/1mpt

The next tests will only be done on the last nightly (current, and tested: build #0915).

**mglae** · September 17, 2018 at 6:54 PM

Now amdgpu driver is loaded and your monitor is detected. But the radeon driver is loaded too and xorg does crash.

Two Ideas:

- Disable the onboard graphics of the A6-6400K in BIOS configuration if possible.

- Disable the radeon kernel driver:

Code

mount -o remount,rw /flash
nano /flash/syslinux.cfg

Add initcall_blacklist=radeon_init to the APPEND line, save and reboot.

sk4hrr · September 17, 2018 at 7:50 PM

Disabling the A6 GPU does not change anything: 1537209101.jpg

But, your tips works, but with this command:

Code

mount -t vfat -o rw,remount /dev/sda1 /flash

Should I do that every time I update?

**mglae** · September 17, 2018 at 10:36 PM

Quote from sk4hrr
Disabling the A6 GPU does not change anything: 1537209101.jpg

But, your tips works, but with this command:
Code
mount -t vfat -o rw,remount /dev/sda1 /flash

Thanks, fixed my post.

Quote

Should I do that every time I update?

No, an update does not change syslinux.cfg.

Without kernel radeon driver ~/.config/udev.rules.d/97-xorg.rules is not needed any more, delete it.

sk4hrr · September 17, 2018 at 11:09 PM

Quote from mglae

Without kernel radeon driver ~/.config/udev.rules.d/97-xorg.rules is not needed any more, delete it.

After I test on the latest nightly build (#0916), I did a test on fresh install of 8.90.005 release. So, it's already deleted, thanks.

Start-up problem solved, but conversion from HDR to SDR not. Too bad. Thank you for your help!

LibreELEC v8.90.004 : no UI

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