Bug#342053: Boot-time script to disable DFB's HW acceleration

[Attilio Fiandrotti]

This script should disable DFB's harware acceleration for those vesa 
drivers whose accelerated modes are known to be broken.
I think this script should be named something like "Sxxdisable_dfbhw.sh" 
and should be installed into /lib/debian-installer.d and provided by 
rootskel-gtk package.
Since this is meant mainly for PPC systems, Sven could you please have a 
look at it?
A more appropriate name for "DISABLE_FB_ACCELERATION" boot option i've 
added may be needed too.

thanks
Attilio


#List of vesa drivers that require DFB's HW acceleration to be disabled
BAD_LIST="atyfb nvidiafb"

if [ -z "DISABLE_FB_ACCELERATION" ]; then
        echo "no-hardware" >>/etc/directfbrc
else
        for driver in $BAD_LIST; do
                if [ $(dmesg|grep $driver |wc -w) -gt 0 ];then
                        echo "no-hardware" >>/etc/directfbrc
                        break;
                fi
        done
fi


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