buildroot 2021.02.1: black screen after Xorg launched

Hello,

Using buildroot 2021.02.1 for x64 I built root file system that contain Xorg.
Right after Xorg is launched I got black screen.

According to Xorg.0.0.log (attached) there is no error.
I tried to run: xeyes and got:
Can't open display

I noticed the following lines in Xorg.0.0.log:
Code:[ 5.116] (==) No Layout section. Using the first Screen section.
[ 5.116] (==) No screen section available. Using defaults.
[ 5.116] (**) |-->Screen "Default Screen Section" (0)
[ 5.116] (**) | |-->Monitor "<default monitor>"
[ 5.117] (==) No monitor specified for screen "Default Screen Section".On the same PC I booted Knoppix 9.1. Xorg works fine.

I noticed that Knoppix contains several files in:
/usr/share/X11/xorg.conf.d

But in my file system this folder contains only the file: 10-quirks.conf

Can you please advise what can be the reason for the black screen ?

Thank you,
Zvika
Attached Files

	cpuinfo.log (15.6 KB)
	dmesg.log (57.8 KB)
	meminfo.log (1.2 KB)
	Xorg.0.0.log (31.8 KB)
	config.log (102.0 KB)