journalctl -r -x --boot=-2. This is the log when booted with radeon.dpm=0
journal_log_radeon_dpm_is_0 (text/plain), 184.56 KB, created by Trippler on 2015-05-02 17:24:50 UTC
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Creator: Trippler
Created: 2015-05-02 17:24:50 UTC
Size: 184.56 KB
Actions: View
Attachments on bug 90284: 115515 | 115516 | 115594 | 115595

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