[Bug 36438] ATI card fan is always on with opensource radeon driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=36438

Tadej Janež <tadej.janez at tadej.hicsalta.si> changed:

           What    |Removed                     |Added
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                 CC|                            |tadej.janez at tadej.hicsalta.
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--- Comment #19 from Tadej Janež <tadej.janez at tadej.hicsalta.si> 2012-05-13 07:31:00 PDT ---
Hi!

The overheating of my HP Elitebook 8530p with Mobility Radeon HD 3650 video
card has been bothering me for a while now, however, I've just been researching
the issue today.

(In reply to comment #18)
> 
> This problem seems to be specific to your system.  Please make sure the heat
> sinks and fans are clear of dust and and that the acpi thermal zones for your
> system are working properly.

Alex, I can confirm this issue is not specific to his system.
I have the same laptop (HP Elitebook 8530p) with the same graphics card
(Mobility Radeon HD 3650 video card - AMD RV635) and I'm also experiencing the
same issues. I've also thought the issue is with the "dust carpet" around the
heat fan/sink, but it is not the case. Since I bought the laptop in Nov 2008, I
had to remove the dust around the heat fan/sink every half year to keep the
laptop cool (the temperature dropped around 5 degrees Celsius after cleaning),
so I know this could be an issue.

Only today, I managed to decrees the laptop's temperature by using the fix
suggested by Pasi in bug #41762, namely switching the power_profile from
"default" to "low":

[root at tlinux64 ~]# cat /sys/class/drm/card0/device/power_profile 
default
[root at tlinux64 ~]# 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
[root at tlinux64 ~]# echo low > /sys/class/drm/card0/device/power_profile 
[root at tlinux64 ~]# cat /sys/class/drm/card0/device/power_profile 
low
[root at tlinux64 ~]# cat /sys/kernel/debug/dri/0/radeon_pm_info 
default engine clock: 600000 kHz
current engine clock: 109680 kHz
default memory clock: 700000 kHz
current memory clock: 405000 kHz
voltage: 900 mV
PCIE lanes: 16
[root at tlinux64 ~]

As I commented in bug #41762, the system is around ~15 degrees colder now.

Alex, does this convince you that the issue is real and it should be worked on?

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