I have an older Radeon card, XPRESS 200M 5955 (PCIE) and see graphical artifacts without KMS. With KMS I cannot suspend/hibernate. I'm still on 4.5, haven't yet had time to update. I guess trying the latest [http://www.fsfla.org/svnwiki/selibre/linux-libre/download/releases/ Linux-libre kernel] might help.

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