A few questions from an iMac G5 user...

[Torrance]

Hi all,

I have a few questions about running Debian PPC on my iMac G5 (rev A). I
have recently switched from Ubuntu after learning that their ppc distro was
in question and I'm settling in fine, but have a few queries:

1) Is it possible to enable either sleep or suspend functions for the iMac
G5? I am currently running the 2.6.19 kernel, but I don't have the slightest
clue how to enable suspend or sleep. These functions never worked in Ubuntu.
Is this possible?

2) Is it a good idea to enable ESD? I was having a few system freezes when
using multiple multimedia players (Totem Xine, Rhythmbox and VLC), and have
since enabled esd (and installed gstreamer-esd and vlc-esd). Things seem to
be fine, but I'm not really sure what is an ideal sound setup.

3) How do I install java for running, eg. internet java applets? In Ubuntu
we had to download from an IBM site. Currently, that site requires
registration and even then told me that export laws (or something) would
mean the download would be reviewed and I'd be notified when it was
available. Of course, this never happened. So how else do ppc users get java
installed? Alternatively, how long will it be before we see Adobe's recently
released source code making its way into sid?

4) Is it possible to brighten the screen on an iMac G5. It looks darker and
duller than OS X, but besides altering the gamma settings, there seems no
way to brighten the screen.

Cheers,
Torrance

Re: A few questions from an iMac G5 user...

[Torrance]

Hi Ben (and Charles),

Thanks for your replies!


There is currently no sleep support for G5s Suspend To Disk should
be doable without too much pain though I didn't have time to do  
anything

about it, I remember some patches were posted at one point doing at
least part of the job.


These are patches to the kernel? Do you know where I could find those?


2) Is it a good idea to enable ESD? I was having a few system freezes
when using multiple multimedia players (Totem Xine, Rhythmbox and
VLC), and have since enabled esd (and installed gstreamer-esd and
vlc-esd). Things seem to be fine, but I'm not really sure what is an
ideal sound setup.


System freeze ? Or just application blocking because another one is
using the driver ?


Well, not quite a system freeze. The music would continue playing,  
and the mouse would move, but no windows would be selectable, and no  
keyboard commands would do anything. Forcing-quitting x-windows was  
non-responsive, and I couldn't shift into another terminal space  
either. This problem was repeatable, but not consistently so. In any  
case, ESD hasn't done this to me yet (but I haven't pushed it too far  
either), but I still am unsure what the best sound setup is, and  
whether I should be letting sound go straight through to ALSA and  
(presumably) hardware mixing.



Yes, there is a magic register and indeed, it looks like the value set
in there by nvidiafb might be slightly lower than what OS X does on  
this

machine


Great! So I'm not crazy! ;) Is this user-configurable? Which conf  
file should I be editing?


Weird, they might have changes something... I had no problem last  
time I

d/l the IBM Java. That's the best option at the moment. Now that Sun
Java is GPL, there is hope to have more options available though.


I know, it is weird. Last time I checked the US hadn't put any trade  
sanctions on New Zealand!!


Thanks,
Torrance






On 3/12/2006, at 12:26 AM, Benjamin Herrenschmidt wrote:




1) Is it possible to enable either sleep or suspend functions for the
iMac G5? I am currently running the 2.6.19 kernel, but I don't have
the slightest clue how to enable suspend or sleep. These functions
never worked in Ubuntu. Is this possible?


There is currently no sleep support for G5s Suspend To Disk should
be doable without too much pain though I didn't have time to do  
anything

about it, I remember some patches were posted at one point doing at
least part of the job.

As for Suspend To RAM... well... the iMac G5 is an SMU based  
machines. I
_think_ I know what command can be sent to the SMU to instruct it  
to put

the machine to sleep, though I haven't really tried doing it. The main
problem is that sleep will shut down the video chip and we currently
can't bring an nVIdia chip back.

It might be possiblea after a good deal of reverse engineering, or  
help

from nVidia (don't hold your breath on that), but not at the moment.


2) Is it a good idea to enable ESD? I was having a few system freezes
when using multiple multimedia players (Totem Xine, Rhythmbox and
VLC), and have since enabled esd (and installed gstreamer-esd and
vlc-esd). Things seem to be fine, but I'm not really sure what is an
ideal sound setup.


System freeze ? Or just application blocking because another one is
using the driver ?


3) How do I install java for running, eg. internet java applets? In
Ubuntu we had to download from an IBM site. Currently, that site
requires registration and even then told me that export laws (or
something) would mean the download would be reviewed and I'd be
notified when it was available. Of course, this never happened. So  
how

else do ppc users get java installed? Alternatively, how long will it
be before we see Adobe's recently released source code making its way
into sid?




You can also use gij/gcj but they can't run quite as much things as  
the
IBM JVM can (at least IBM own internal expense report system :-)  
Though

I've been told they can run Eclipse.

There's also Kaffe but that's pretty outdated...


4) Is it possible to brighten the screen on an iMac G5. It looks
darker and duller than OS X, but besides altering the gamma settings,
there seems no way to brighten the screen.


Yes, there is a magic register and indeed, it looks like the value set
in there by nvidiafb might be slightly lower than what OS X does on  
this

machine

The problem is that there are several machine models with similar  
nVidia
chips and they seem to require differnent "max" values there,  
though we

haven't quite figured how to properly identify which model needs what,
so we are stuck right now with what we think is a "safe" value (ie.
won't damage the display).

I have some contacts at nVidia that were supposed to enquire about  
that

but I had no reply over the past few monthes, I'll try to ask again.

Ben.

iMac G5 Bugs and new wiki

[Torrance]

Hi all,

A few of us iMac G5 users who have recently switched from Ubuntu to Debian
(testing) have been writing up a wiki with all the little hacks to get
things sorted, and also with those that we still don't know how to fix. The
new wiki is here: http://wiki.debian.org/iMacG5

In case anybody knows the answers to our remaining problems, I thought I'd
ask them here:

1) Fan control and sound do not work 'out of the box.' We know how to fix
these through a simple kernel recompile, but we were wondering if these will
be fixed when Etch goes stable?

2) Hibernate does not work. So far, no patches or hacks have allowed us to
suspend-to-disk. We are aware that standby (suspend-to-ram) is very unlikely
to be able to work, but hibernate should.

3) Switch User Freeze. The option in the Gnome menu that appears when
logging out, called "Switch User", results in a total system freeze. The
screen becomes a total mess of coloured pixels, and no kill-xserver command
saves us. We are forced to hard-reboot.

4) Screen too dim. The default backlight brightness in Debian is noticably
dimmer than in MacOS X. So far, we have not been able to work out how to fix
this.

5) Screen cannot be turned off. SImilar to above: no command allows us to
put the display to sleep, and turn off the backlight. At the moment, the
screen goes black but the backlight remains on, resulting in no power saving
and potentially damaging the screen.

None of these issues have been filed as bugs; the Debian bug system is too
difficult for us newbies to understand as it requires us to know the
packages we are filing the bugs under.

Thanks in advance,

Torrance

Re: iMac G5 Bugs and new wiki

[Torrance]

Hi Michel,

We've discovered the problem lies with the kernel configuration: the
standard Debian 2.6.18 kernel Switches Users fine. Our custom kernels
however, do not.

Unfortunately, I'm not sure what exactly isn't configured properly. My
kernel is essentially a standard g5_defconfig, plus firewall support. I've
attached the config file, and would be most interested if anyone can spot
the problem.

Torrance

On 12/12/06, Michel Dänzer <[EMAIL PROTECTED]> wrote:


On Sun, 2006-12-10 at 15:03 +1300, Torrance wrote:
>
> 3) Switch User Freeze. The option in the Gnome menu that appears when
> logging out, called "Switch User", results in a total system freeze.
> The screen becomes a total mess of coloured pixels, and no
> kill-xserver command saves us. We are forced to hard-reboot.

There's probably an issue with starting the second X server. At least
the full X config and log files are required for diagnosing this.


--
Earthling Michel Dänzer   |  http://tungstengraphics.com
Libre software enthusiast |  Debian, X and DRI developer



config-2.6.19-g5_defconfig
Description: Binary data

Re: Default I/O Scheduler for Etch

[Torrance]

Hi Brian,

Yes, this is the case. Check out the kernel config file in /boot and  
you'll see the kernel has been compiled with CFQ as default.


Torrance


On 15/12/2006, at 12:06 AM, Brian wrote:

Can anyone tell me if the default scheduler for Etch (specifically  
Etch-Testing) is CFQ?


I took a look at my /sys/block/sda/queue/scheduler
file, and it looks like this:

noop anticipatory deadline [cfq]

Do the brackets around [cfq] indicate that it is the default  
scheduler?


I'm just wondering because the faqs on
http://www.linux1394.org
suggest that cfq is good for firewire (among other things)

Thanks!


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Constantly Switching Gnome Theme on Fresh Install

[Torrance]

Hi,

I've just done a fresh install of Debian Etch from a daily build net- 
install cd image on an iMac DV SE (g3, graphite), and everything is  
working fine except that the gnome theme is constantly changing  
between the one I have it set to and and old-looking theme. It looks  
as though there is some conflict between theme settings.


After a while, I received this error:


There was an error starting the GNOME Settings Daemon.

Some things, such as themes, sounds, or background settings may not  
work correctly.


The Settings Daemon restarted too many times.

The last error message was:

System exception: IDL:Bonobo/GeneralError:1.0 : Child process did not  
give an error message, unknown failure occurred


GNOME will still try to restart the Settings Daemon next time you log  
in.

__

So what's going on? It's bringing my system to a halt. Not sure if  
its a ppc-specific issue or not.


Torrance



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Re: Constantly Switching Gnome Theme on Fresh Install

[Torrance]

Wow, yes, that worked! And such a quick reply. :)

Thanks very much,
Torrance

On 3/5/07, Ananda Samaddar <[EMAIL PROTECTED]> wrote:


There is a known bug in Gstreamer that only affects non-Altivec PowerPC
machines.  You need to get upgraded libvisual packages from here:

http://people.debian.org/~sjoerd/libvisual/

This worked for me.

regards,

Ananda



On Mon, 5 Mar 2007 18:14:17 +1300
Torrance <[EMAIL PROTECTED]> wrote:

> Hi,
>
> I've just done a fresh install of Debian Etch from a daily build net-
> install cd image on an iMac DV SE (g3, graphite), and everything is
> working fine except that the gnome theme is constantly changing
> between the one I have it set to and and old-looking theme. It looks
> as though there is some conflict between theme settings.
>
> After a while, I received this error:
>
> 
> There was an error starting the GNOME Settings Daemon.
>
> Some things, such as themes, sounds, or background settings may not
> work correctly.
>
> The Settings Daemon restarted too many times.
>
> The last error message was:
>
> System exception: IDL:Bonobo/GeneralError:1.0 : Child process did not
> give an error message, unknown failure occurred
>
> GNOME will still try to restart the Settings Daemon next time you log
> in.
> __
>
> So what's going on? It's bringing my system to a halt. Not sure if
> its a ppc-specific issue or not.
>
> Torrance
>
>
>
> --
> To UNSUBSCRIBE, email to [EMAIL PROTECTED]
> with a subject of "unsubscribe". Trouble? Contact
[EMAIL PROTECTED]
>


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Re: [FYI] hibernate on G5

[Torrance]

Hi Jonhannes (or anyone else),

Are you talking about the vanilla 2.6.22 kernel? I have 2.6.22-rc2 from
kernel.org but I can't find the option to enable your patches. I'm using
menuconfig to configure the kernel - could you tell me where your patch(es)
are and how they should be enabled? I'm interested to test out the
suspend-to-disk functionality!

I have EXPERIMENTAL=y already set.

Thanks,

Torrance

On 5/18/07, Johannes Berg <[EMAIL PROTECTED]> wrote:


Hi,

Recently, I wrote some patches to allow hibernate (aka suspend-to-disk)
to work on G5 machines and at one point posted references to them in
some thread here. These patches are available with the kernel as of
2.6.22-rc1 when compiled with EXPERIMENTAL=y.

johannes

Re: [FYI] hibernate on G5

[Torrance]

Also, assuming the kernel is compiled correctly, how does one run the new
suspend-to-disk scripts? I tried using hibernate which failed, complaining
there were no known methods available. However, this could also simply be a
result of not properly compiling the kernel.

Torrance

On 5/20/07, Torrance <[EMAIL PROTECTED]> wrote:


Hi Jonhannes (or anyone else),

Are you talking about the vanilla 2.6.22 kernel? I have 2.6.22-rc2 from
kernel.org but I can't find the option to enable your patches. I'm using
menuconfig to configure the kernel - could you tell me where your patch(es)
are and how they should be enabled? I'm interested to test out the
suspend-to-disk functionality!

I have EXPERIMENTAL=y already set.

Thanks,

Torrance

On 5/18/07, Johannes Berg <[EMAIL PROTECTED] > wrote:
>
> Hi,
>
> Recently, I wrote some patches to allow hibernate (aka suspend-to-disk)
> to work on G5 machines and at one point posted references to them in
> some thread here. These patches are available with the kernel as of
> 2.6.22-rc1 when compiled with EXPERIMENTAL=y.
>
> johannes
>
>

Re: [FYI] hibernate on G5

[Torrance]

On 5/20/07, Johannes Berg <[EMAIL PROTECTED]> wrote:



Well, the regular applies. If you have SMP then you need to enable
CPU_HOTPLUG, and then you should be able to enable SOFTWARE_SUSPEND.



Ah, thank you.

Except now when I attempt to suspend-to-disk the screen gets messed up with
colours, the system freezes, and after a short while the fans spin up to
full speed.

Here's the verbose output of a dry run (I can't make sense of it):

[EMAIL PROTECTED]:~$ sudo hibernate -v4 --dry-run
hibernate: Trying method in suspend2.conf...
hibernate: Trying method in disk.conf...
hibernate: Trying method in ususpend-disk.conf...
hibernate: Including configuration from common.conf
hibernate: Trying method in sysfs-disk.conf...
hibernate: Including configuration from common.conf
+ date
+ echo Starting suspend at Sun May 20 21:35:05 NZST 2007
+ tee -a -i /var/log/hibernate.log
+ EXIT_CODE=0
+ [ tee -a -i /var/log/hibernate.log = cat ]
+ [ -n  ]
+ trap  INT
+ exec
+ exec
+ DoWork
+ trap ctrlc_handler INT HUP
+ local ret
+ local CHAIN_UP_TO
+ local bit
+ CHAIN_UP_TO=0
+ SortSuspendBits
+ /bin/echo -ne
91ModulesUnloadBlacklist\n99DoSysfsPowerStateSuspend\n10EnsureSysfsPowerStateCapable\n95XHacksSuspendHook2\n11XHacksSuspendHook1\n91ModulesUnloadBlacklist\n59RemountXFSBootRO\n01NewKernelFileCheck\n89SaveKernelModprobe\n98CheckRunlevel\n01CheckRunlevel\n01CheckLastResume\n01LockFileGet\n
+ tee -a -i /var/log/hibernate.log
+ sort -n
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("01CheckLastResume", 1, 2)}
+ new_CHAIN_UP_TO=01
+ [ -n 01 ]
+ CHAIN_UP_TO=01
+ bit=CheckLastResume
+ vecho 1 hibernate: [01] Executing CheckLastResume ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [01] Executing CheckLastResume ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("01CheckRunlevel", 1, 2)}
+ new_CHAIN_UP_TO=01
+ [ -n 01 ]
+ CHAIN_UP_TO=01
+ bit=CheckRunlevel
+ vecho 1 hibernate: [01] Executing CheckRunlevel ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [01] Executing CheckRunlevel ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("01LockFileGet", 1, 2)}
+ new_CHAIN_UP_TO=01
+ [ -n 01 ]
+ CHAIN_UP_TO=01
+ bit=LockFileGet
+ vecho 1 hibernate: [01] Executing LockFileGet ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [01] Executing LockFileGet ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("01NewKernelFileCheck", 1, 2)}
+ new_CHAIN_UP_TO=01
+ [ -n 01 ]
+ CHAIN_UP_TO=01
+ bit=NewKernelFileCheck
+ vecho 1 hibernate: [01] Executing NewKernelFileCheck ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [01] Executing NewKernelFileCheck ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("10EnsureSysfsPowerStateCapable", 1, 2)}
+ new_CHAIN_UP_TO=10
+ [ -n 10 ]
+ CHAIN_UP_TO=10
+ bit=EnsureSysfsPowerStateCapable
+ vecho 1 hibernate: [10] Executing EnsureSysfsPowerStateCapable ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [10] Executing EnsureSysfsPowerStateCapable ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("11XHacksSuspendHook1", 1, 2)}
+ new_CHAIN_UP_TO=11
+ [ -n 11 ]
+ CHAIN_UP_TO=11
+ bit=XHacksSuspendHook1
+ vecho 1 hibernate: [11] Executing XHacksSuspendHook1 ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [11] Executing XHacksSuspendHook1 ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("59RemountXFSBootRO", 1, 2)}
+ new_CHAIN_UP_TO=59
+ [ -n 59 ]
+ CHAIN_UP_TO=59
+ bit=RemountXFSBootRO
+ vecho 1 hibernate: [59] Executing RemountXFSBootRO ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [59] Executing RemountXFSBootRO ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("89SaveKernelModprobe", 1, 2)}
+ new_CHAIN_UP_TO=89
+ [ -n 89 ]
+ CHAIN_UP_TO=89
+ bit=SaveKernelModprobe
+ vecho 1 hibernate: [89] Executing SaveKernelModprobe ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [89] Executing SaveKernelModprobe ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("91ModulesUnloadBlacklist", 1, 2)}
+ new_CHAIN_UP_TO=91
+ [ -n 91 ]
+ CHAIN_UP_TO=91
+ bit=ModulesUnloadBlacklist
+ vecho 1 hibernate: [91] Executing ModulesUnloadBlacklist ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [91] Executing ModulesUnloadBlacklist ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("91ModulesUnloadBlacklist", 1, 2)}
+ new_CHAIN_UP_TO=91
+ [ -n 91 ]
+ CHAIN_UP_TO=91
+ bit=ModulesUnloadBlacklist
+ vecho 1 hibernate: [91] Executing ModulesUnloadBlacklist ...
+ local v
+ v=1
+ shift
+ [ x = x1 ]
+ [ 1 -le 4 ]
+ echo hibernate: [91] Executing ModulesUnloadBlacklist ...
+ [ -n 1 ]
+ continue
+ local new_CHAIN_UP_TO
+ awk BEGIN{print substr("95XHacksSuspendHook2", 1, 2)}
+ new_CHAIN_UP_TO=95
+ [ -n 95 ]
+ CHAIN_UP_TO

Re: [FYI] hibernate on G5

[Torrance]

The messed up screen seems to be partly an error with the nv driver  
or nvidiafb. Issuing the command "echo disk > /sys/power/state" with  
xserver running results in the same error.


However, with xserver stopped I get this response from the hibernate  
command:


Stopping task... done
Shrinking memory... done (0 pages free)
Freed 0 kbytes in 0.06 seconds (0.00MB/s)
Suspending console(s)

Unfortunately at this point the system locks up, the text above  
remains on the screen, and after a short while the fans spin up to  
full speed.


I'm not sure what's going on. :(

Torrance


On 20/05/2007, at 9:46 PM, Johannes Berg wrote:


On Sun, 2007-05-20 at 21:44 +1200, Torrance wrote:

On 5/20/07, Johannes Berg <[EMAIL PROTECTED]> wrote:

Well, the regular applies. If you have SMP then you need to
enable
CPU_HOTPLUG, and then you should be able to enable
SOFTWARE_SUSPEND.

Ah, thank you.

Except now when I attempt to suspend-to-disk the screen gets  
messed up

with colours, the system freezes, and after a short while the fans
spin up to full speed.

Here's the verbose output of a dry run (I can't make sense of it):


Neither can I. Have you tried just "echo disk > /sys/power/state"? And
have you turned off nvidiafb?

johannes



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Re: PowerBook G4 screen in Debian not as bright as Mac OS X or OpenBSD

[Torrance]

Hi Amit,

I'm not sure what the graphics card is in your powerbook, but I  
noticed a reduction in brightness compared to OSX when using Debian  
on my iMac G5 (revA) which has an nvidia device. When I put the  
question to this list, this is the response I got back:



On Sun, Dec 10, 2006 at 03:03:29PM +1300, Torrance wrote:

4) Screen too dim. The default backlight brightness in Debian is  
noticably
dimmer than in MacOS X. So far, we have not been able to work out  
how to fix

this.



What kind of graphics chip do you have?

You should be able to upload a new backlight curve if you're using  
Linux

2.6.18 or higher. Also, for NVidia chips, we haven't yet found out for
sure how to detect the maximum value allowed (I was the one rewriting
the backlight infrastructure in 2.6.18). Hence it might be that, when
using an NVidia chipset, the display is not that bright as in Mac  
OS X.


And anyway, this is in no way distribution specific.

Greets,
Michael


Unfortunately, I had no idea how to play with the brightness curve so  
I had to stick with the brightness I was given.


Torrance


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Re: fonts in xorg

[Torrance]

Hi Gustav,

It may be related to this problem: http://wiki.debian.org/iMacG5  
(scroll down to "Minor Font Fix" section) It's not a problem with  
your font rendering, as far as I can tell, but just with the specific  
rendering of Helvetica on specific sites that force its use.


And yeah, it's not powerpc specific.

Torrance



On 1/09/2007, at 1:19 AM, Gustav Gepard wrote:

Hi

I'm trying to get better font resolutions on websites that I visit.  
Many fonts seem hard and pixilated, such as on Debian's home page.  
How can I optimise xorg for better font rendering?


cheers

Gustav


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On 1/09/2007, at 1:19 AM, Gustav Gepard wrote:


Hi

I'm trying to get better font resolutions on websites that I visit.  
Many fonts seem hard and pixilated, such as on Debian's home page.  
How can I optimise xorg for better font rendering?


cheers

Gustav


Alt i én. Få Yahoo! Mail med adressekartotek, kalender og notisblokk.



GnuPG / PGP Encrypted mail welcome.
Public key ID: F708102A

CD Drive Issue Installing on iMac G5

[Torrance]

Hiya everyone,

I'm a total newbie to Linux/Debian and I'm trying to install Sarge on
my iMac G5. I'm getting past the initial installer screens, setting
the language, country, keyboard, etc. HOWEVER, just before it attempts
to run the rest of the installer of the CD it comes up with an error
claiming it cannot locate the CD drive. It asks me to locate the
driver (I think) but I wouldn't know where to point it.

I have no idea what to do - but this must be a common problem with
hardware that is as generic as Apple's. Can anyone help?

These are my computer specs in brief:

Hardware Overview:

  Machine Name: iMac G5
  Machine Model:PowerMac8,1
  CPU Type: PowerPC G5  (3.0)
  Number Of CPUs:   1
  CPU Speed:1.8 GHz
  L2 Cache (per CPU):   512 KB
  Memory:   1.5 GB
  Bus Speed:600 MHz
  Boot ROM Version: 5.2.2f4

And this the CD drive specs in detail:

MATSHITA DVD-R   UJ-825:

  Firmware Revision:DBN7
  Interconnect: ATAPI
  Burn Support: Yes (Apple Shipped/Supported)
  Cache:2048 KB
  Reads DVD:Yes
  CD-Write: -R, -RW
  DVD-Write:-R, -RW, +R, +RW
  Burn Underrun Protection CD:  Yes
  Burn Underrun Protection DVD: Yes
  Write Strategies: CD-TAO, CD-SAO, DVD-DAO
  Media:
  Media Type:   CD-ROM
  Blank:No
  Erasable: No
  Overwritable: No
  Appendable:   No