PPC64/Jessie/TrustyTahr - GraphicFailure

[richard kuenz <csae2608@uibk.ac.at>]

Hello ,

i would like to use my newly acquired Powermac G5 with Linux PPC for 
Kodi/XBMC.

With Wheezy i had success installing and configuring sound with the help 
of this list; so that was really nice.

but XBMC did not run as hoped as there were quite some broken 
dependencies; so i ended up upgrading to jessie;

but after upgrading, i get a messed up screen at StartX and cannot login.

same happened with ubuntu - which was very loud when installed from a 
mini.iso of 12.04 from 2010 - but after upgrading to 14.04 LTS 3 offered 
the same panorama - messed up graphic screen where the login-window used 
to be.


i am able with ALT+CTRL+f1 to enter terminal.

what can i do here?


thanks

richard