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Re: Mac G3 testing - desktop .iso


o jordan,

The adding module process did not work for me, maybe I missed a step.
Should I add my comments to yours at your bug report?
I still like your idea, especially the part about getting KMS to work as "KMS is the future"

What I tested on a G3 iMac 400MHz, Lubuntu precise-alternate-powerpc.iso 20120305.

1. sudo nano /etc/yaboot.conf
2. edited append="quiet splash" to append="quiet splash video=offb:off"
3. control-o, then control-x
4. sudo ybin -v

5. sudo nano /etc/modules
6. added: aty128fb 
7. control-o, then control-x
8. sudo nano /etc/initramfs-tools/modules
9. added: aty128fb
10. control-o, then control-x
11. sudo update-initramfs -u
12. sudo reboot

Brings me eventually to a black screen where control-option-1 works to bring me to command line.

Alternately, a second try modifying line 6) aty128fb mode_option=1024x768-24@60
brought me to a black screen where control-option-1 did not work.

And then I tried updating the xorg.conf:
Section "Monitor" 
     Identifier "Monitor0"
     HorizSync 58-62 
     VertRefresh 75-117
No change.

Eventually, I edited xorg.conf as I have before with a longer list of entries.
That didn't work until I restored yaboot.conf and etc/modules back to their original states, before my changes.

Paul Gorski


-----Original Message-----
From: o jordan <ojordan12345@xxxxxxxxxxxxx>
To: Paul Gorski <paul@xxxxxxxxxxx>; lubuntu-qa <lubuntu-qa@xxxxxxxxxxxxxxxxxxx>
Sent: Wed, Mar 7, 2012 1:44 pm
Subject: RE: [Lubuntu-qa] Mac G3 testing - desktop .iso

In the past there were many problems.  This is not necessarily the case anymore.  The one you hit first is this:

       Option "UseFBDev" "boolean"
              Enable or disable  use  of  an  OS-specific  framebuffer  device
              interface  (which  is not supported on all OSs).  See fbdevhw(4)
              for further information.  Default: on for PowerPC, off for other

The r128 video driver is trying to use a framebuffer you don't have loaded (it is blacklisted).  That is why I have raised this bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/949288 .  Please confirm.

Until the aty128fb gets built back in, the fix for the problem on an installed system without editing the xorg.conf is explained here https://wiki.ubuntu.com/PowerPCFAQ#How_do_I_load_a_kernel_module.3F .  Add aty128fb to /etc/modules and the initramfs-tools file as explained.  You'll need to use video=offb:off when booting.

You shouldn't have to mess around disabling dri as you shouldn't have hardware acceleration in 12.04.

On reboot, if you still hit a command prompt then you'll have to adjust your frequency settings in an xorg.conf.  

Section "Monitor" 
     Identifier "Monitor0"
     HorizSync 58-62 
     VertRefresh 75-117

That's all you should need to put in, but it could be the case it works without it now.

To: ojordan12345@xxxxxxxxxxxxx; lubuntu-qa@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Lubuntu-qa] Mac G3 testing - desktop .iso
From: paul@xxxxxxxxxxx
Date: Wed, 7 Mar 2012 12:00:57 -0500

I appreciate the interest in the problem. The PowerPC FAQ does little to explain the root cause of the problem, but does offer a wealth of information regarding temporary fixes, usually through xorg.conf.

I'm all for getting the problem fixed correctly. At one time the live CD wasn't work on iBook G4's or Powerbook G4's, but that problem has been resolved. (12.04 boots fine on iBook G4, although desktop installer screens are dark).

If there are any logs or screen shots that I can supply to help out, let me know.

Also, is there anything I can do, other than modifying the xorg.conf, to get the live installer to work or the alternate to not boot to a command prompt. I'd just like to test 12.04 on the G3 iMac.

For example, at Yaboot prompt:

live video=aty128fb:1024x768-24@60 video=offb:off  NoUseFBDev

(I'm guessing at the correct syntax based on the PowerPC FAQ and some other notes I have. Not even sure if I can invoke NoUseFBDev at this point.)

I'd still have to write some sort of permanent changes to the new install, wouldn't I?



Paul Gorski


-----Original Message-----
From: o jordan <ojordan12345@xxxxxxxxxxxxx>
To: lubuntu-qa <lubuntu-qa@xxxxxxxxxxxxxxxxxxx>
Sent: Wed, Mar 7, 2012 2:28 am
Subject: Re: [Lubuntu-qa] Mac G3 testing - desktop .iso

Paul and Jim,

If you read the PowerPC FAQ there is a large section on graphics, much of it based around the imac G3.  It explains what is going and why it fails to load.  It explains it much better than I can put in a single post to a message list.

In 11.04 and 11.10 (and at the moment 12.04) the appropraite framebuffer is not built in.  I'm going to file a bug to get the ones used by Apple hardware built back in to the kernel.  This is why the openfirmware framebuffer is loading and causing you problems.

In the past the r128 caused dri lockup.  This is not going to happen in 12.04 because you won't have 3d hardware acceleration.

Please do not include a 5 year plus old xorg.conf file in a recent version on Lubuntu.  The problems are not the same.
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