vt(4)-related hang of 11.2

[Eugene Grosbein]

>>>> In most cases it's just wrong info passed from UEFI firmware about FB.
>>>> try to hardcode FrameBuffer params into vt_efb driver, to know exatly.
>>>
>>> Forgot to add importand detail: it boots and works with vt(4) using FreeBSD 11.1.
>>>
>>
>> r322258 is known working stable/11 revison that booted such a system with default console just fine;
>> stable/11 r338465 hangs.
> 
> Looking at the diff, I see I should try hw.vga.acpi_ignore_no_vga=1 that stable/11 got in between...
> I'll try next day and respond.

hw.vga.acpi_ignore_no_vga=1 solved the problem and now it boots with vt(4) just fine.

The question is: why it hangs and does not boot "blind" without this setting?
Can it panic maybe?

This box has no COM-port at glance (for serial console) but dmidecode reports it has...