# cat /etc/redhat-release 
Fedora release 16 (Verne)

# uname -a
Linux localhost.localdomain 3.1.0-0.rc6.git0.3.fc16.x86_64 #1 SMP Fri Sep 16 12:26:22 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

# lspci|grep -i vga
01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon HD 3650

$ 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 
84000

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

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

(wait for 5 mins.. and notice how fans slow down)

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp 
72000

# 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