Comment # 7
on bug 75992
from Ed Tomlinson
The only setting I cannot revert in the patch is: pi->mclk_dpm_key_disabled = 1; To avoid humdreds of: radeon 0000:01:00.0: GPU fault detected: 146 0x0aa20804 and 147 type errors I had to add: export R600_DEBUG=nohyperz in the X startup as documented in: https://bugzilla.kernel.org/show_bug.cgi?id=66981 Also found some funny stuff to do with primary and secondary graphic cards. booting with the primary as the builtin hd4600, with no radeon specific stuff in the kernel command line does NOT enable the dpm on the secondary radeon card and trying to use radeon.dpm=1 causes the X startup to stall. Note in all cases the a xorg.conf file selects the radeon card to be used.
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