Re: [9front] MB Pro early-2011 support status

[unobe@cpan.org]

Quoth Nick Owens <mischief@offblast.org>:
> i added blanking for some cards in this commit:
> 
> changeset:   6686:2f61fba90cd1
> user:        mischief <mischief@offblast.org>
> date:        Tue Aug 21 11:31:45 2018 -0700
> summary:     igfx: support blanking by turning off panel power and backlight
> ...
> you can also see the value of PP_CONTROL in the aux/vga -p output in
> your sysinfo. maybe double check the programming manual for the
> PP_CONTROL register location and value to see if those bits are
> correct.
> 
> IIRC this code worked for me and others on thinkpads, but it's
> possible that this register isn't hooked up in this hardware.

Thanks, mischief!  I had seen that bit of code so thought it should
have worked as well. 
https://01.org/sites/default/files/documentation/snb_ihd_os_vol3_part3_0.pdf
on pages 49-51 explain PP_CONTROL, and it would be odd, I would think,
for it not to work on a macbook that does do screen blanking when
running OS X (unless there's another mechanism for it).  A couple
lines down from the ppcontrol in 'aux/vga -p' there's a line about
lvds and vgacntrl:

	igfx lvds            [000e1180] = 80300302
	igfx vgacntrl        [00041000] = 8024298e

Do you know if that means vga commands for blanking could then be
supported, something like what's tried in
/sys/src/9/pc/vga.c:/^vgablank ?