[BUG] simplefb not showing any output

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Hi guys,

I have been trying simplefb from mainline (v3.11-5058-g57d7309), with
a couple of patches on top (one to make simplefb actually load on my
system, posted to x86 earlier today, and one to make it show some
output posted to this list earlier today).

The driver seems to load ok, but sadly it does not give any output. If
I boot via the gummiboot menu the screen remains black, and if I don't
enter the gummiboot menu the screen remains grey (it is a Mac).

Except for that the machine works (I can log on blindly in order to reboot).

Is this a known problem? Any suggestions on where to start debugging?
Any more info I could provide?

The output given during boot is

calling  simplefb_driver_init+0x0/0x14 @ 1
simple-framebuffer simple-framebuffer.0: simplefb: framebuffer at
0x90000000, mapped to 0xffffc90009b00000
simple-framebuffer simple-framebuffer.0: simplefb: format a8r8g8b8,
mode is 1366x768x32, linelength=5632
simple-framebuffer simple-framebuffer.0: fb0: simplefb registered!
initcall simplefb_driver_init+0x0/0x14 returned 0 after 1072 usecs

-t
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