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TinyCore x86 boots to black screen with underscore

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GNUser:
I have a T400 ThinkPad. Nothing fancy about it except for the fact that it has Libreboot rather then BIOS. All hardware is 2008 vintage, including integrated Intel graphics ("Mobile 4 Series Chipset Integrated Graphics Controller" according to lshw).

- Core x86 (no X) works beautifully on this machine: Boots to a command line and everything works.
- TinyCore x86 (with X) does not seem to work: Boots to a black screen with an underscore at the top left.

I'm not sure how to troubleshoot given that no errors are shown and I can't even change to a different tty using Ctrl+Alt+F<number>

I'd like to make TC the OS on my laptop, but need to get over this hump. Can you please help me troubleshoot this issue?

GNUser:
P.S. When booting TinyCore, the initial steps of the boot process seem to go well: I see the duplicate Tiny Core graphic at the top, then several boot messages scroll by without any obvious errors or warnings. Then the screen is cleared a first time and I briefly see an "ascii art" penguin at the top and a message about mcookie...urandom read yada yada. At that point the screen is cleared a second time (my guess is that this second clearing of the screen is when X is being started) and remains all black except for a steady underscore at top-left; keyboard input has no effect.

Juanito:
Can you check if Xvesa, flwm, wbar and aterm are loaded?

GNUser:
I don't think I can check that. Even if I boot with multivt bootcode, when boot process is complete the system does not respond to any keyboard input.

Juanito:
Use the “text” boot code.

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