[Bug 68235] Display freezes after login with kernel 3.11.0-rc5 on Cayman with dpm=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68235

--- Comment #32 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
(In reply to comment #31)
> Created attachment 85989 [details] [review]
> testing patch
> 
> Try this patch independent from any other patches.  It forces the engine and
> memory clocks of all performance levels within a power state to the lowest
> level.  If it works, then try and comment out either the sclk part or the
> mclk part and see if either helps.  That should help us narrow down whether
> it's a mclk problem or an sclk problem.

Running with the patch works fine over a vanilla kernel 3.12-rc1. The following
works also fine:
//    if (pl->sclk > 25000)
//        pl->sclk = 25000;
    if (pl->mclk > 15000)
        pl->mclk = 15000;
Which means sclk is working properly.

However, the opposite results in a blank screen before I can even get at the
login screen. It seems mclk is the problematic part.

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