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[Lamer <544525@xxxxxxxxxxxxxxxxxx>]

Thanks for pointing me to this quick workaround "jcervilla", on my
system it worked only after I disabled KMS via kernel parameter (I don't
know why the original method using "/etc/modprobe.d/radeon-kms.conf"
didn't have any effect on my laptop.). In "/etc/default/grub" I added:
GRUB_CMDLINE_LINUX="radeon.modeset=0". Than I updated grub (sudo update-
grub) and after the restart external monitor stopped flickering (Also I
was able to set the appropriate resolutions on both displays).

-- 
[RV380] dual monitor not working - M24 1P [Radeon Mobility X600]
https://bugs.launchpad.net/bugs/544525
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