Tiny Core Linux

Tiny Core Base => Raspberry Pi => Topic started by: yvs on July 03, 2024, 10:58:15 AM

Title: piCore15 and RPi3B+: GUI black screen
Post by: yvs on July 03, 2024, 10:58:15 AM

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

Quote

[     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+).

Title: Re: piCore15 and RPi3B+: GUI black screen
Post by: Paul_123 on July 03, 2024, 11:01:04 AM

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.

Title: Re: piCore15 and RPi3B+: GUI black screen
Post by: yvs on July 03, 2024, 11:12:08 AM

> 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?

Title: Re: piCore15 and RPi3B+: GUI black screen
Post by: Paul_123 on July 03, 2024, 11:52:05 AM

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

Title: Re: piCore15 and RPi3B+: GUI black screen
Post by: yvs on July 03, 2024, 03:00:22 PM

> 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

Quote

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

Quote

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Title: Re: piCore15 and RPi3B+: GUI black screen
Post by: Paul_123 on July 03, 2024, 03:18:46 PM

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

Title: Re: piCore15 and RPi3B+: GUI black screen
Post by: yvs on July 03, 2024, 03:34:35 PM

openssh.tsz

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

Title: Re: piCore15 and RPi3B+: GUI black screen
Post by: yvs on July 03, 2024, 03:46:53 PM

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

Title: Re: piCore15 and RPi3B+: GUI black screen
Post by: curaga on July 04, 2024, 03:20:44 AM

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.

Title: Re: piCore15 and RPi3B+: GUI black screen
Post by: yvs on July 04, 2024, 08:54:19 AM

> 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.