https://bugs.freedesktop.org/show_bug.cgi?id=103370

--- Comment #28 from Shih-Yuan Lee <fourdollars@gmail.com> ---
`vblank_mode=0 DRI_PRIME=1 glxgears` will also introduce the GPU lock up.
However when using radeon.dpm=0, it won't happen but it is tearing all the
time.

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