[Bug 30922] New: [radeon] Noisy fan with Radeon R600 and Toshiba Satellite L500-164

[Bug 30922] New: [radeon] Noisy fan with Radeon R600 and Toshiba Satellite L500-164

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30922

           Summary: [radeon] Noisy fan with Radeon R600 and Toshiba
                    Satellite L500-164
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.38-rc8 (at least since 2.6.35)
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: denisw@online.de
        Regression: No


When I use my Toshiba Satellite L500-164 laptop (AMD/ATI Radeon HD 4650) with
the radeon KMS driver, the GPU fan spins up very quickly (and loudly) after
booting and makes no attempt at spinning down subsequently (I need to fully
reboot for this to happen). The resulting noise makes the driver unusable for
me currently, which is unfortunate as it works perfectly otherwise.

I have tested this with every kernel version since I have this laptop, that is,
2.6.35, 2.6.36, 2.6.37 (different distributions each), and 2.6.38-rc8 mainline.

I don't know if it is helpful in any way, but I have looked to see if the
machine has any external thermal sensors attached to the GPU (using lm_sensors
and by looking into sysfs), but only the Intel Core sensors (coretemp) have
been found. I assume that means that the GPU has an internal thermal sensor,
but I don't know.

With the propietary fglrx driver, fan speed control works just fine.

If you need any further information, just ask.

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[Bug 30922] [radeon] Noisy fan with Radeon R600 and Toshiba Satellite L500-164

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30922


Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com




--- Comment #1 from Alex Deucher <alexdeucher@gmail.com>  2011-03-15 07:29:57 ---
For more information about the power management options in the driver, see the
"KMS Power Management Options" section of this page:
http://wiki.x.org/wiki/RadeonFeature

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[Bug 30922] [radeon] Noisy fan with Radeon R600 and Toshiba Satellite L500-164

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30922





--- Comment #2 from Alex Deucher <alexdeucher@gmail.com>  2011-03-15 07:30:38 ---
Laptops generally expose the GPU temperature via an acpi thermal zone or an oem
specific sensor.

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[Bug 30922] [radeon] Noisy fan with Radeon R600 and Toshiba Satellite L500-164

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30922





--- Comment #3 from Denis Washington <denisw@online.de>  2011-04-05 13:30:30 ---
I am aware of the power management options you pointed to, but they don't help
with the fan problem (at best, they delay it slightly). /sys/class/thermal does
not contain any thermal zones, there are only two CPU-related cooling devices
and an LCD cooling device listed there:

$ ls /sys/class/thermal
cooling_device0
cooling_device1
cooling_device2
$ cat /sys/class/thermal/cooling_device0/type
Processor
$ cat /sys/class/thermal/cooling_device0/device/path
\_PR_.CPU0
$ cat /sys/class/thermal/cooling_device1/type
Processor
$ cat /sys/class/thermal/cooling_device1/device/path
\_PR_.CPU1
$ cat /sys/class/thermal/cooling_device2/type
LCD
$ cat /sys/class/thermal/cooling_device2/device/path
\_SB_.PCI0.P0P2.VGA_.LCD_

Does that mean it is an OEM-specific sensor? Why is it that fglrx can control
the fan just fine then? (Or does fglrx have code specific to certain hardware
vendors?) How I can find out more about how the GPU fan is controlled with this
laptop?

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[Bug 30922] [radeon] Noisy fan with Radeon R600 and Toshiba Satellite L500-164

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30922





--- Comment #4 from Denis Washington <denisw@online.de>  2011-05-27 09:30:10 ---
I have talked to Dave Airlie on IRC (#radeon at freenode) today and it seems
that my assumption that thermal sensor access is needed for proper fan control
is wrong. Rather, the GPU seems to do fan control automatically and can only be
influenced by the driver by giving a new policy table to the graphics card's
BIOS.

The radeon driver doesn't currently do this, however, and relies on the BIOS'
defaults, which however seem to be bad on my machine. This is why my fan mostly
runs in full speed.

Dave says he thinks that there's some of the code lying around inside AMD to do
proper fan control setup, but still in need of a lot of review. If this is the
case, I would be happy to test the code once it's published in git.

(Please correct me if I am wrong about anything I've written here.)

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[Bug 30922] [radeon] Noisy fan with Radeon R600 and Toshiba Satellite L500-164

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30922





--- Comment #5 from Alex Deucher <alexdeucher@gmail.com>  2011-05-27 14:23:25 ---
Laptops don't generally use the onboard GPU fan controller and thermal sensor
since they usually have a single fan for both the GPU and the CPU.  The fan and
thermal zones are generally exposed via ACPI or a vendor specific control.  For
more info on the power management options in the driver see the page I linked
in comment #1.

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[Bug 30922] [radeon] Noisy fan with Radeon R600 and Toshiba Satellite L500-164

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30922





--- Comment #6 from Denis Washington <denisw@online.de>  2011-06-02 10:46:39 ---
As I have already stated, changing the power management options didn't change
anything at all. Even running the "low" profile doesn't stop the fan from
cranking up to full speed under normal desktop load and never spinning down
again, even if the system is idling.

I am also most certain that my laptop has a separate GPU fan; I can, in fact,
control the CPU fan per sysfs, but whatever I do, the GPU fan keeps spinning at
the same speed, so I guess there must be separate fans for CPU and GPU.

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[Bug 30922] [radeon] Noisy fan with Radeon R600 and Toshiba Satellite L500-164

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30922


Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|                            |OBSOLETE




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