Ubuntu

Noisy fan and slowness after upgrade to Gutsy

Bug #156995 reported by malex
6
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Ubuntu
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Bug Description

After upgrading from Feisty to Gutsy, on my old Asus L3000D the fan starts when the cpu temperature reach 70C and it never stops. On the same moment, the system starts going very slow, running at a fraction of the cpu power. I didn't find a way to fix this issue, I need to restart the system and keep cpu temperature below the 70C. I can reproduce this behavior using glxgears. See below:

malex@laptop:~$ date
gio ott 25 10:35:41 CEST 2007
malex@laptop:~$ glxgears
1500 frames in 5.0 seconds = 299.217 FPS
1695 frames in 5.1 seconds = 331.437 FPS
1695 frames in 5.2 seconds = 328.003 FPS
1695 frames in 5.2 seconds = 327.978 FPS
1695 frames in 5.3 seconds = 322.321 FPS
1695 frames in 5.1 seconds = 329.639 FPS
1695 frames in 5.2 seconds = 327.958 FPS
1695 frames in 5.2 seconds = 327.182 FPS
1695 frames in 5.2 seconds = 328.103 FPS
565 frames in 6.9 seconds = 81.580 FPS <===== here the fan starts spinning
339 frames in 7.5 seconds = 44.943 FPS
339 frames in 7.5 seconds = 45.467 FPS
339 frames in 7.5 seconds = 45.193 FPS

malex@laptop:~$ date
gio ott 25 10:37:07 CEST 2007

Revision history for this message
malex (malexorg) wrote :

When booting with old kernel (2.6.20-16) this issue disappears, so it looks like a kernel bug. Again, with old kernel, running the glxgears program doesn't heat the cpu as the new kernel, and his temperature never reaches the trigger value of 70C.

Revision history for this message
yannek (yannek-deactivatedaccount) wrote :

I have also problems on a L3000D with a fan that shows erratic behavior. Yet different from yours. But could you please post the content of /proc/acpi/processor/CPU0/power in bug #157407 as I'm "investigating" several ACPI problems that became much more appearant with 2.6.22.

And a possible fix to your Problems could be a fixed DSDT.
You could take a look at: https://help.ubuntu.com/community/ACPIBattery
There is described how to fix a DSDT an use it as a substitute to the one in the BIOS.

The behaviour of my laptop was the following: If the CPU Tempretur dropped below 35°C, what was usual every cold start after a pause, the fan went to full speed stayed there and the cpu became abysmal slow.
If it stayed above this level from the beginning the fan ran slowly till the system had booted up and the colling became effectiv enough to cool it below 35°C and bang.
I located the variable in the DSDT that encoded this 35° and lowered it to 16°. Now the fan never stops (staying slow), but the laptop can be used until a proper solution ist found.

Revision history for this message
Leann Ogasawara (leannogasawara) wrote :

Hi Malex,

I'm going to mark this report as a duplicate of 160103. That report is assigned to a specific package which is more helpful to us. Also, you've attached the appropriate log files to that report so it has more useful information to help us debug. Thanks!

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