[Bug 69723] GPU lockups with kernel 3.11.0 / 3.12-rc1 when dpm=1 on r600g (Cayman)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69723

--- Comment #38 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
A couple of observations. I've forced power state to performance and
performance state to high. Here is the result:
[root at Xander device]# more /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 2    sclk: 83000 mclk: 130000 vddc: 1060 vddci: 1150

Now, keeping this configuration, I launched a video relying on UVD. The result
downclocks the core clock from 830 (probably limited to 800 as we know) to 725.
[root at Xander device]# more /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 54000 dclk: 40000
power level 2    sclk: 72500 mclk: 130000 vddc: 1060 vddci: 1150

However, if I don't force this power and performance states combination
(letting it as balanced and auto or performance and auto), I have the
following:
[root at Xander device]# more /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 54000 dclk: 40000
power level 0    sclk: 50000 mclk: 130000 vddc: 1000 vddci: 1150
[root at Xander device]# more /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 54000 dclk: 40000
power level 2    sclk: 72500 mclk: 130000 vddc: 1060 vddci: 1150

As you can see, it will adapt to the needed performance state.

- So, first question: is it expected to see a lowered sclk when UVD is active?
- Second one: when the performance is changed automatically (auto), could we be
triggering a performance state change too quickly?
- Third one: it was previously said mclk is tied to vddci AND vddc. Wouldn't
there be a chance we could encounter a problem here if vddc=1000 and not 1060
when running at full speed?
- Last one: is there a way to monitor the GPU temperature and/or the GPU fan
speed? (even at full speed when highly solicited, the fan is not running as
fast as when dpm=0. I'm wondering if I'm not overheating from time to time).

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