https://bugs.freedesktop.org/show_bug.cgi?id=91880
--- Comment #7 from Lauri Gustafsson luutifa@gmail.com --- I did get Unigine Heaven running with DPM on for a few seconds (before hanging), showing way better frame rates than before. It really seems that - The performance issues are most likely caused by the lack of DPM - DPM for Grenada GPUs is not supported completely Or: - My card has a really weird (stock) VBIOS that Radeon(si?) cannot interpret/work with.