Bug 770470

Description of problem:

I'm using HP EliteBook 8530P laptop with Mobility Radeon HD 3650, and it's overheating with RHEL 6.x. I've tested with RHEL 6.0 and RHEL 6.1, and now I tested also with CentOS 6.2 liveCD (2.6.32-220.el6.x86_64).

This problem also happens with Fedora 14, Fedora 15 and Fedora 16.

As a default radeon power_profile "default" is being used, and it causes laptop
overheating and emergency thermal shutdowns.. on a completely idle system! It
seems the power management doesn't work with the opensource radeon driver on
this laptop. See below for analysis and more info.

When I manually switch the radeon power_profile to "low" (see below) the
temperature of the laptop decreases over 10-20 degrees celsius, making the laptop much cooler and also the fans will immediately slow down because the
temperature goes down. Any idea why the "default" power_profile doesn't
automatically run the card at lower engine/memory clock speeds?

More information from CentOS 6.2 liveCD (x64) below.. notice how the
temperature goes down from 84C-89C to 72C when manually switching to power_profile "low".


Version-Release number of selected component (if applicable):
RHEL 6.2, 2.6.32-220.el6.x86_64.

How reproducible:
Always.

Steps to Reproduce:
1. Install RHEL 6.2 on HP EliteBook 8530P with the default Gnome desktop.
2. Notice how the laptop runs very hot and fans are running at high speed all the time, even when the system is idle, only running the empty desktop.
3. Manually switch to power_profile "low" and the temperature immediately goes down and fans slow down.
  
Actual results:
With the default settings laptop overheats and does emergency thermal shutdowns.

Expected results:
Laptop runs cool and works normally.

Additional info:

Upstream bug:
"radeon default power_profile "default" makes laptop overheat (Mobility Radeon HD 3650)":
https://bugs.freedesktop.org/show_bug.cgi?id=41762


$ uname -a
Linux livecd.centos 2.6.32-220.el6.x86_64 #1 SMP Tue Dec 6 19:48:22 GMT 2011 x86_64 x86_64 x86_64 GNU/Linux

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

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

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

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
84000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
89000


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


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

$ 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
77000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
76000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
75000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
74000

$ cat /sys/devices/virtual/thermal/thermal_zone3/temp
73000

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