I had been test and ....with:
nomodeset nouveau.modeset=0 On Nvidia i have Xorg working but colors are 
totally wrong and gfx totally glitchedRadeon reply with drm ERROR UMS not 
supported by radeon module.
nomodeset nouveau.modeset=0 radeon.modeset=0 video=radeonfb:off 
video=nouveaufb:off On Nvidia i have Xorg working but colors are totally wrong 
and gfx totally glitchedRadeon reply with drm ERROR UMS not supported by radeon 
module.
if i set: nomodeset nouveau.modeset=1 radeon.modeset=0 video=radeonfb:off 
video=nouveaufb:off i have black screen on nvidia and on radeon
if i set :nomodeset nouveau.modeset=0 radeon.modeset=1 video=radeonfb:off 
video=nouveaufb:off i have screen on radeon but Xorg crash like reported on 
Xorg dev .
if i set :video=offb:off in all the options write before and not set the 
modeset to 1 on one the modulei dont have screen at all.

Luigi Burdo
(i continue be out for all new release  :- ( ) 
> Date: Thu, 30 Apr 2015 22:49:43 -0700
> From: dand1...@yahoo.com
> Subject: Re: PowerMac G5, GeForce FX 5200, black screen
> To: rbtho...@pobox.com
> CC: intermedi...@hotmail.com; risto.suomi...@gmail.com; 
> debian-powerpc@lists.debian.org
> 
> On my machine with an ATI card, the boot parameters "radeon.modeset=0" or 
> "nomodeset" work.  So on the second Yaboot screen, I type either "Linux 
> radeon.modeset=0" or "Linux nomodeset" to disable KMS.  For machines with 
> Nvidia cards, you can do either "Linux nomodeset" or "Linux 
> nouveau.modeset=0".  To make the boot parameters permanent so you don't have 
> to type them in anymore, add them with the "append" line to your yaboot.conf 
> like this:
> 
> image=/boot/vmlinux
>     label=Linux
>     read-only
>     initrd=/boot/initrd.img
>     append="nomodeset video=offb:off"
> 
> I added the "video=offb:off" parameter because my machine experienced a bug 
> where the open firmware framebuffer was inhibiting the fall-back radeon 
> framebuffer from loading:
> 
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=782066
> 
> Also, don't forget to run "sudo ybin -v" after changing yaboot.conf.  I 
> always forget that.
> 
> Regards,
> 
> Dan
>         
> --------------------------------------------
> On Thu, 4/30/15, Rick Thomas <rbtho...@pobox.com> wrote:
> 
>  Subject: Re: PowerMac G5, GeForce FX 5200, black screen
>  To: "Dan DeVoto" <dand1...@yahoo.com>
>  Cc: "luigi burdo" <intermedi...@hotmail.com>, "Risto Suominen" 
> <risto.suomi...@gmail.com>, "PowerPC List Debian" 
> <debian-powerpc@lists.debian.org>
>  Date: Thursday, April 30, 2015, 5:39 PM
>  
>  Disabling KMS sounds like
>  something I could try (as I say, no X running on this
>  machine).
>  
>  How do I do
>  that?
>  
>  Thanks!
>  Rick
>  
>  On Apr
>  30, 2015, at 2:02 PM, Dan DeVoto wrote:
>  
>  > I have the black screen problem on my
>  iBook.  It happens about halfway through the boot process,
>  when kernel modesetting is enabled.  I left a bug
>  report:
>  > 
>  > https://bugs.freedesktop.org/show_bug.cgi?id=90220
>  > 
>  > A workaround is to
>  boot with parameters that disabled KMS, but if you have X
>  running you'll have an unaccelerated desktop.
>  > 
>  > Regards,
>  > 
>  > Dan
>  > 
>  > 
>  >
>  --------------------------------------------
>  > On Thu, 4/30/15, Rick Thomas <rbtho...@pobox.com>
>  wrote:
>  > 
>  > Subject:
>  Re: PowerMac G5, GeForce FX 5200, black screen
>  > To: "luigi burdo" <intermedi...@hotmail.com>
>  > Cc: "Risto Suominen" <risto.suomi...@gmail.com>,
>  "PowerPC List Debian" <debian-powerpc@lists.debian.org>
>  > Date: Thursday, April 30, 2015, 1:35 PM
>  > 
>  > 
>  > I
>  > don’t have X.org
>  on this machine.  I’m trying to keep
>  >
>  it as simple as possible, so I did not install any
>  desktop
>  > task.  Just the basic virtual
>  terminal console.
>  > 
>  >
>  Even so, I get the usual text
>  > streaming
>  by during the boot process, but then a blank
>  > screen.  The system is up — I can ssh
>  into it, but no
>  > console.
>  > 
>  > Anybody know
>  > what’s causing it?
>  >
>  
>  > Rick
>  > 
>  > On Apr
>  > 30, 2015, at
>  5:02 AM, luigi burdo <intermedi...@hotmail.com>
>  > wrote:
>  > 
>  >> I start have
>  > this
>  issue on Jessie
>  >> but the black
>  > screen is the simptom i face because Xorg
>  make a hard crash
>  > (reported to xorg
>  devs).
>  >> switch to tty
>  > ... and try to make xinit or start x .
>  >> 
>  > 
>  >> On wheezy delete the xorg.conf and
>  > probably you will fix it
>  >> 
>  >> Luigi
>  Burdo
>  >> 
>  >>>
>  Subject: Re: PowerMac G5, GeForce FX
>  >
>  5200, black screen
>  >>> From: rbtho...@pobox.com
>  >>> Date: Thu, 30 Apr 2015 02:49:42
>  > -0700
>  >>> CC: debian-powerpc@lists.debian.org
>  >>> To: risto.suomi...@gmail.com
>  >>> 
>  >>>
>  Hi
>  > Risto,
>  >>>
>  
>  >>> 
>  > I’m
>  seeing this as well. I have a PowerMac11,2 (dual core
>  > G5 7GB RAM)
>  >>>
>  
>  >> 
>  >> Did you
>  ever discover how to fix it without holding
>  > back on the kernel level?
>  >>> 
>  >>>
>  Anybody? All clues are welcome!
>  >>>
>  
>  >>> Thanks!
>  >>> Rick
>  >>>
>  
>  >>> On Dec 1, 2014, at 6:16 AM,
>  Risto
>  > Suominen <risto.suomi...@gmail.com>
>  > wrote:
>  >>> 
>  >>> 
>  >> Hi,
>  >>>> 
>  >>>> This is probably an old
>  issue,
>  > possibly discussed before, even
>  on this list.
>  >>>> 
>  >>>> 
>  > I've
>  been holding my linux-image as version 3.2.0-2 to
>  > avoid the problem.
>  >>>> 
>  >>>> So, the problem: after
>  upgrading
>  > to 3.2.0-4, X display is not
>  working.
>  >> 
>  >>> According to Xorg.log everything
>  is as before, but
>  > the screen remains
>  >>>> black. (At
>  > boot the text console is ok.)
>  >>>> 
>  > 
>  >>>> I'm using kernel
>  command
>  > line:
>  >>>> 
>  >> 
>  >>> video=TV-1:d
>  >>>> 
>  >>>> and xorg.conf:
>  >>>> 
>  >>>> 
>  > Section
>  "Device"
>  >>>> 
>  > Identifier "Configured Video
>  Device"
>  >>>> BusID
>  > "PCI:240:16:0"
>  >>>> 
>  > Driver
>  "nouveau"
>  >>>> 
>  > Option "Monitor-TV-1"
>  "Configured
>  > Monitor"
>  >>>> Option   
>  > "NoAccel"   
>  "true"
>  >>>>
>  EndSection
>  >> 
>  >>> 
>  >>>>
>  Section
>  > "Monitor"
>  >>>> 
>  >
>  Identifier "Configured Monitor"
>  >>>> Option "Ignore"
>  > "true"
>  >>>> 
>  >
>  EndSection
>  >>>> 
>  >>>> Section "Screen"
>  >>>> Identifier "Default
>  > Screen"
>  >>>> Device
>  >
>  "Configured Video Device"
>  >>
>  
>  >>> EndSection
>  >>>> 
>  >>>> In addition, I've tried
>  to
>  > add /etc/modprobe.d/nouveau.conf:
>  >>> 
>  >> 
>  >>>> nouveau noaccel=1
>  >>>> 
>  >>>> 
>  > It makes
>  no difference.
>  >>>> 
>  >>>> I'm using Wheezy (7.7)
>  with
>  > all latest packages.
>  >>>> 
>  >>>> The machine is PowerMac7,3
>  > (2x1,8 GHz, 1,25 GB RAM).
>  >>>> 
>  >>>> Anyone else seen this?
>  >>>> 
>  >>>> 
>  > Risto
>  >>>> 
>  > 
>  > 
>  > --
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>  
>  > 
>  
>  
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