Regarding your display issue I can only point you in the direction of what is 
already in the FAQ 
https://wiki.ubuntu.com/PowerPCFAQ#Are_there_any_radeon_tweaks_I_can_do.3F
 
Play around with EXA and XAA in an xorg.conf and see if it is that.
 > Date: Wed, 22 Feb 2012 00:20:09 -0800
> From: [email protected]
> To: [email protected]; [email protected]; 
> [email protected]
> Subject: [Lubuntu-qa] results of      
> lubuntu/daily-live/20120221/precise-desktop-powerpc
> 
> see
> http://iso.qa.ubuntu.com/qatracker/milestones/204/builds/12316/testcases/1182/results
> 
> some long standing ppc-specific bugs could use some confirmation, namely
> * Lubuntu Software Center crashing on boot
> * lubuntu-default-settings for Application Launch Bar in lxpanel
> mistakenly referencing chromium-browser.desktop and not firefox.desktop
> 
> also some quirky behavior with the artwork which seems to be new but not
> ppc-specific.
> 
> and a crash removing a plugin from lxpanel which i've never experienced
> before. might be a fluke. not sure if it's ppc-specific or not.
> 
> lastly, ever since testing 12.04 on ppc i've had this same problem with
> the display that i can't quite figure out what to file a bug against.
> see previous mail here:
> https://lists.launchpad.net/lubuntu-qa/msg00122.html
> and also see comment on the test report. they may be related. any help
> would be most appreciated.
> 
> wxl
> 
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