[Bug 91880] Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing

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Comment # 7 on bug 91880 from
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.


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