[Bug 92974] Fiji Nano long boot up and long X startup with amdgpu-powerplay enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92974

--- Comment #17 from charlie <bug0xa3d2 at hushmail.com> ---
The bios was updated from 0801 to 2603. The machine booted normally with an
unpatched kernel.  I restored previous overclocking settings and the long boot
bug returned.  Among testing a few bios parameters I found that adjusting "NB
Configuration--PCIEX16_1"--like forcing auto(PCIEX16_2), X16 or X8--has no
effect on the bug.

"APU Frequency" or base clock is the only setting found to effect the long
boot/startx bug.  Any base clock values greater than 100 causes the bug. 
Underclocking CPU, NB and RAM has no effect when base clock is set to 101--the
bug remains.

This behavior did not occur before the commit mentioned earlier in this bug
report thread as the base clock remained the same since before I first
submitted the bug and until my recent testing today.

With "amdgpu.pcie_gen_cap=0x00030003" applied through LILO this machine is
capable of running at 104 base clock stable with system RAM near
2500mhz--without the long boot/startx bug.

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