Use this 
Linux radeon.modeset=1 video=offb:off video=1024x768-32 video=radeonfb:off 
radeon.agpmode=-1

Sent from my iPhone

> On Apr 29, 2015, at 2:41 PM, Christian Wehrli <[email protected]> wrote:
> 
> Hallo Herminio,
> 
> I was using no boot parameters.
> 
> Am 29.04.2015 20:30, schrieb Herminio Hernandez Jr. : 
> 
>> What did you use as your boot parameters in yaboot?
>> 
>> Sent from my iPhone
>> 
>> On Apr 29, 2015, at 12:47 PM, luigi burdo <[email protected]> wrote:
>> 
>>> Here on Quad G5 Xorg crash totally on jessie and it is not usable ...
>>> sed the Wheezy was working really good.
>>> The same issue i face on Lubuntu 15.04 and Ubuntu Mate too.
>>> No problems on Open Suse 13.2
>>> I had been reported the issue of Xorg to xorg devs with a screenshot of the 
>>> issue and crash.
>>> 
>>> Luigi Burdo
>>> 
>>> Date: Tue, 28 Apr 2015 20:14:30 +0200
>>> From: [email protected]
>>> Subject: Debian Jessie with openbox on iBook G4 crashing when 
>>> firmware-linux-nonfree is installed
>>> To: [email protected]
>>> 
>>> Hi!
>>> 
>>> I have upgraded my Debian Wheezy to Jessie on my iBook G4 following the 
>>> upgrade manual from Debian which is really great by the way. 
>>> After that I wasn't able to  type the username in the Loginpanel (slim). 
>>> I was able to change to the command line with CTRL+ALT+F1 and starting a 
>>> openbos session with "startx". Openbox crashes then after ii try to resize 
>>> a window.
>>> With firmware-linux-nonfree not installed it works without crashing once. 
>>> There are also two kernel modules that can't be loaded.  ppdev
>>> andapm_emu.
>>> I decied to make a fresh install. Same behaviour. I made a fresh install on 
>>> another iBook G3. Same behaviour.
>>> Then I tried uninstalling packages. firmware-linux-nonfree was the 
>>> reproducable cause. After reinstalling it crashes again.
>>> 
>>> When running the system without firmware-linux-nonfree I have no sound. So 
>>> I decided to help myself with a 10$ USB DAC from EBAY. It worked fine as 
>>> workaround.
>>> 
>>> Does anyone else had also the same problem?
>>> 
>>> Cheers
>>> Chris

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