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bbfa235
(Get the code!)
Actually, my problem is likely different than yours. Your issue is that the radeon card is still active, even if you are not using the driver.
I switch off the graphics card I'm not using with a startup script:
# disable radeon card
echo DIGD > /sys/kernel/
echo OFF > /sys/kernel/
# disable intel card
echo DDIS > /sys/kernel/
echo OFF > /sys/kernel/