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From: Mr. Strat on 14 Jan 2010 21:40
In article <140120101232053767%star(a)sky.net>, Davoud <star(a)sky.net>
wrote:

> Someone please help me get a handle on this. Mr. Strat says that he did
> it and Mike says that he couldn't have done it.

No, I said that it can't be done. When Apple releases a new model of
computer, it is unable to run any previous operating system version.
From: Davoud on 14 Jan 2010 22:17
Davoud:
> > Someone please help me get a handle on this. Mr. Strat says that he did
> > it and Mike says that he couldn't have done it.

Mr. Strat:
> No, I said that it can't be done. When Apple releases a new model of
> computer, it is unable to run any previous operating system version.

My apologies. There's nothing worse than being misquoted -- ask any
politician.

Still, I need to reconcile Mike's claim to have done this with your
assertion that it can't be done.

Davoud

--
I agree with almost everything that you have said and almost everything that
you will say in your entire life.

usenet *at* davidillig dawt cawm
From: David Empson on 14 Jan 2010 22:51
Davoud <star(a)sky.net> wrote:

> Mr Strat wrote:
> > Mike wrote:
> > > I reloaded an iMac 27" with 10.5 and that's working fine except for
> > > the brightness control. I partitioned the hard drive and loaded
> > > 10.6 in the second partition. My two questions are how to adjust
> > > the brightness in 10.5 and how to fix the freezing issues in 10.6.
> >
> > There's no way you're going to load 10.5 on a new 27" iMac. It will
> > reject the DVD when you try to boot from it.
>
> Someone please help me get a handle on this. Mr. Strat says that he did
> it and Mike says that he couldn't have done it.

You got the names backwards. Mike wrote the first paragraph and Mr.
Strat wrote the second. I've corrected the attributions above.

> I don't think it can be both ways.

The second statement is wrong. It is not true that "there is no way"
that 10.5 can be installed onto a 27" iMac. You just can't do it in the
obvious way (booting from the install DVD), because there is no 10.5.x
install DVD which will recognise a 27" iMac as a supported platform.

Some 10.5 install DVDs will probably boot on a 27" iMac but they not let
you proceed with installation.

Other methods could be used to install 10.5, such as putting the 27"
iMac into target mode and installing from another (supported) Mac, or
cloning an existing 10.5 system.

I would not recommend trying this.

The resulting 10.5 system would be unreliable at best, due to running on
unsupported hardware. In particular, it would be missing drivers for new
hardware components in the 27" iMac. It appears from Mike's original
post that control of the display brightness is one such issue.

There could be lots of other issues, including subtle ones in areas like
managing the CPU, caches, power subsystem, fans, etc. which could result
in poor performance or overheating.

[Agree fully with the rest of Davoud's post, apart from the mixed up
names of earlier posters.]

> I'm neutral -- though I would be curious to know why someone would buy the
> latest and greatest with an OS that was designed for it, one which (at
> least on my wife's new 27") works very well, and then partition the hard
> drive in order to downgrade to two OS's that are obsolete for that
> machine. My WAG is that it seemed like a good idea, or even a necessary
> thing, at the time.
>
> The following assumes, just for the moment, that Mr. Strat did what he
> says he did and that Mike is incorrect in his assertion.
>
> As for Mr. Strat's question, part 1: OS 10.5 is not fully functional
> with the latest generation of iMacs because it lacks the drivers to
> deal with the latest iMac hardware. Lack of the proper video driver is
> the reason you can't adjust the brightness. It may be that the only fix
> is for you to write new video drivers for 10.5 -- if that version of
> the OS can support the features that those drivers need.
>
> Part 2: Wipe the drive and reinstall the OS using the disks that came
> with the iMac. If using the proper OS does not solve the freezing
> issues, a trip to the Genius Bar is in order.
>
> Here's what has worked for me with Macs for more than a quarter of a
> century: start with Apple's recommended OS, then upgrade as recommended
> by Apple. I know that this works for the overwhelming majority of Mac
> users. If your Mac cannot do what you want with the Mac OS, perhaps you
> need to install Windows or another OS on the Mac, or get a different
> hardware set, or write your own OS, along with drivers and software to
> go with it.
>
> Davoud


--
David Empson
dempson(a)actrix.gen.nz
From: Mike Rosenberg on 15 Jan 2010 08:30
Mr. Strat <rag(a)nospam.techline.com> wrote:

> No, I said that it can't be done. When Apple releases a new model of
> computer, it is unable to run any previous operating system version.

And yet he's doing it:

"I reloaded an iMac 27" with 10.5 and that's working fine except for
the brightness control."

--
My latest dance performance <http://www.youtube.com/watch?v=I_9pudbFisE>

Mac and geek T-shirts & gifts <http://designsbymike.net/shop/mac.cgi>
Prius shirts/bumper stickers <http://designsbymike.net/shop/prius.cgi>
From: Mr. Strat on 15 Jan 2010 09:24
In article <1jccq7b.w913vd4hm6iiN%mikePOST(a)TOGROUPmacconsult.com>, Mike
Rosenberg <mikePOST(a)TOGROUPmacconsult.com> wrote:

> Mr. Strat <rag(a)nospam.techline.com> wrote:
>
> > No, I said that it can't be done. When Apple releases a new model of
> > computer, it is unable to run any previous operating system version.
>
> And yet he's doing it:
>
> "I reloaded an iMac 27" with 10.5 and that's working fine except for
> the brightness control."

I'm still not buying it - I do computers for a living.
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