Power profiles low and mid are identical on Radeon HD6470M

[Wolfgang Fritz]

Hello,

I have an HP Elitebook 8560p with Radeon HD7470M graphics, running 
Debian sid with kernel 3.0.4.

I noticed that the power profiles low and mid are setting identical 
clocks and voltage, the lowest possible values:

default engine clock: 750000 kHz
current engine clock: 99990 kHz
default memory clock: 900000 kHz
current memory clock: 149970 kHz
voltage: 900 mV

Looking at the code, this seems to be intentional at least for the 
mobility chips, but the chip provides more modes:

[    9.361401] [drm] R600: Number of power states = 7
[    9.361402] [drm] Is mobility = YES
[    9.361403] [drm] ps #0 type 0, modes=3
[    9.361404] [drm] 0: mclk=90000, sclk=75000, volt=1100, vddci=0
[    9.361406] [drm] 1: mclk=90000, sclk=75000, volt=1100, vddci=0
[    9.361407] [drm] 2: mclk=90000, sclk=75000, volt=1100, vddci=0
[    9.361409] [drm] ps #1 type 4, modes=3
[    9.361410] [drm] 0: mclk=15000, sclk=10000, volt=900, vddci=0
[    9.361411] [drm] 1: mclk=90000, sclk=40000, volt=1000, vddci=0
[    9.361413] [drm] 2: mclk=90000, sclk=75000, volt=1100, vddci=0
[    9.361414] [drm] ps #2 type 0, modes=3
[    9.361415] [drm] 0: mclk=90000, sclk=70000, volt=1100, vddci=0
[    9.361417] [drm] 1: mclk=90000, sclk=70000, volt=1100, vddci=0
[    9.361418] [drm] 2: mclk=90000, sclk=70000, volt=1100, vddci=0
[    9.361419] [drm] ps #3 type 2, modes=3
[    9.361420] [drm] 0: mclk=15000, sclk=10000, volt=900, vddci=0
[    9.361422] [drm] 1: mclk=15000, sclk=10000, volt=900, vddci=0
[    9.361423] [drm] 2: mclk=30000, sclk=30000, volt=900, vddci=0
[    9.361424] [drm] ps #4 type 2, modes=3
[    9.361426] [drm] 0: mclk=65000, sclk=40000, volt=900, vddci=0
[    9.361427] [drm] 1: mclk=65000, sclk=40000, volt=900, vddci=0
[    9.361428] [drm] 2: mclk=65000, sclk=40000, volt=900, vddci=0
[    9.361430] [drm] ps #5 type 2, modes=3
[    9.361431] [drm] 0: mclk=30000, sclk=30000, volt=900, vddci=0
[    9.361433] [drm] 1: mclk=30000, sclk=30000, volt=900, vddci=0
[    9.361434] [drm] 2: mclk=30000, sclk=30000, volt=900, vddci=0
[    9.361435] [drm] ps #6 type 0, modes=3
[    9.361436] [drm] 0: mclk=65000, sclk=40000, volt=900, vddci=0
[    9.361438] [drm] 1: mclk=65000, sclk=40000, volt=900, vddci=0
[    9.361439] [drm] 2: mclk=65000, sclk=40000, volt=900, vddci=0
[    9.361440] [drm] NOT CHIP_R600

(dmesg output from patched radeon module)

Questions:
1. Is this a bug or a feature? (I see that it is not obvious which power 
state to choose)
2. What do the 3 clock/voltage modes per power state mean?

Regards,
Wolfgang