Backlight control on iMAC G5 8,1

[Daniel Sharoh]

Hi everyone,

Sorry if this is the wrong place for my question. Maybe I should ask on IRC
instead?

I'm new to freeBSD and BSD in general, but am a long time linux user. I
have an iMac G5 that I've installed freeBSD 10.2 on, and it's generally
working well. This system uses the ATI Radeon 9600 graphics card, and I am
using the ati-ums driver with X because the the regular ati driver won't
build on my system (it says intel only when I try to build it). One major
problem I have with my system is that I cannot control the backlight level.

For example 'sysctl dev.backlight.0.level=0' has no effect.
'xset dpms force off'  blanks the screen but leaves the backlight on

When I query sysctl dev.backlight I get

dev.backlight.0.level: 2956
dev.backlight.0.%parent: vgapci0
dev.backlight.0.%pnpinfo:
dev.backlight.0.%location:
dev.backlight.0.%driver: backlight
dev.backlight.0.%desc: PowerBook backlight for nVidia graphics
dev.backlight.%parent:

Which seems suspicious because I don't have an nVidia graphics card.

I see atibl.c in /usr/src/sys/powerpc/powermac/, but that module isn't
available in /boot/kernel/ or /usr/src/sys/modules

Does anyone have any idea what I could do? I haven't been able to find any
information, probably because I'm new to BSD and ask the wrong questions.

Another unrelated problem is that I don't have any control over the
hardware volume using 'mixer.' Programs like mplayer can use software
control, as in this post
https://lists.freebsd.org/pipermail/freebsd-ppc/2014-January/006796.html,
but it would be nice to have hardware control. Is this currently achievable
on the iMac 8,2?

Thanks!
Dan


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