piCore15 and RPi3B+: GUI black screen

[yvs]

Hi everyone!

After piCore15 installation on Raspberry 3B+ I've tried to load Xorg and stuck with black screen on DSI display (std RPi 7" screen).
Looking at Xorg.log, there's lines about detection of proper screen resolution like

[     8.958] (II) FBDEV(0): checking modes against framebuffer device...
[     8.958] (II) FBDEV(0): checking modes against monitor...
[     8.958] (II) FBDEV(0): Virtual size is 800x480 (pitch 800)

but screen is still blank. Suppose that I've missed something obvious. Is there some way to find out what's missing there?

p.s. I'm sure that chosen dtoverlay vc4-fkms-v3d is correct for this Pi (at least it works with other linus' distros on RPi3B+).

[Paul_123]

fkms does nothing anymore on modern kernels.  The DSI display on the pi3B should work without the vc4 driver, If you want to use the vc4 driver, there are specific overlays for the dsi screen.

I'm not in a spot where I can get them, but they are listed in the README in the overlay folder.

[yvs]

> The DSI display on the pi3B should work without the vc4 driver

I usually add that overlay if there's blank Xorg screen with this RPi3B+,
Okay, I've commented out that 'vc4-' overlay, there's still a blank screen when Xorg started.

What needs to be checked out there?

[Paul_123]

What extensions do you have loaded, and what drivers.  What does the Xorg.log say?

[yvs]

> What extensions do you have loaded,
>
  Xorg (and openssh on boot if it matters)

> and what drivers.
>
  not sure what drivers mean here, if that's kenel modules, manually - none, and `lsmod` output looks like

Module                  Size  Used by    Not tainted
squashfs               49152 67
zram                   24576  2
zsmalloc               24576  1 zram
raspberrypi_hwmon      12288  0
raspberrypi_gpiomem    12288  0

 
> What does the Xorg.log say?
>
 a lot of Xorg noisy log lines and nothing suspicious (to me)
 Can't include it in the post, because of getting

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at webmaster@forum.tinycorelinux.net to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

response from the forum www server.

[Paul_123]

You have no drivers loaded.   What are the contents of onboot.lst

[yvs]

openssh.tsz

or (if lazy to type startx)
openssh.tcz
Xorg.tcz

[yvs]

The original question is closed:
after added TC.tcz pack I got GUI screen (cannot get why there wasn't even mouse pointer without WM, but it doesn't matter)

Thanks for hints

[curaga]

Modern Xorg defaults are a black screen and no cursor (for prettier startup). Use the -retro option to get the old stipple and default cursor.

[yvs]

> no cursor for prettier startup
>
  Thanks for clarification.
  It was my wrong expectations based on outdated experience in this case (mouse pointer) as well as with v4- overlay before.