[Bug 291935] Vidconsole (amd64 only) does now show anything on old hardware (MacBook2,1)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291935

--- Comment #6 from Ruslan Zalata <rz@fabmicro.ru> ---
I noticed another problem. As loader detects UGA it switches to "graphics mode"
(default is text mode) and no output from loader is visible since then. I'm
sure that fb_addr, fb_size and fb_stride detected correctly because kernel
produces correct output. Also I tried writing to framebuffer myself from within
efi_find_framebuffer() and could observe it on the screen.

If I set gfx_state.tg_fb_type = FB_TEXT somewhere in cons_update_mode() after
call to efi_find_framebuffer(), it reverts loader console back to text mode and
I can observe output both from loader and from kernel. Looks like there's one
more bug (or an artifact) in loader while rendering text in graphics mode on
UGA.

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