$ uname -a
Linux localhost.localdomain 3.1.0-7.fc16.x86_64 #1 SMP Tue Nov 1 21:10:48 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

$ cat /sys/class/drm/card0/device/power_profile 
default

$ cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 600000 kHz
current engine clock: 594000 kHz
default memory clock: 700000 kHz
current memory clock: 693000 kHz
voltage: 1100 mV
PCIE lanes: 16


$ cat /sys/devices/virtual/thermal/thermal_zone3/device/path 
\_TZ_.CPUZ

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
86000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
86000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
91000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
94000



# echo low > /sys/class/drm/card0/device/power_profile

$ cat /sys/class/drm/card0/device/power_profile 
low

$ cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 600000 kHz
current engine clock: 334120 kHz
default memory clock: 700000 kHz
current memory clock: 405000 kHz
voltage: 900 mV
PCIE lanes: 16

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
83000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
81000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
80000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
79000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
78000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
77000