[Bug 370173] Re: laptop overheats and suddenly shuts down/off

[ceg]

** Description changed:

  Ubuntu 9.04, fresh install on Acer Aspire 5005.
  (confirmed also with 9.10)
  
  Not sure about package, but it seems the problem is with CPU frequency adjustment or fan control.
  Laptop shuts down right in the middle of CPU-greedy operation overheated. I haven't seen it before (since 7.10).
  The issue is discussed at several forums (eg. http://ubuntuforums.org/showthread.php?p=7399158 )
  
       *-cpu
            product: AMD Turion(tm) 64 Mobile Technology ML-37
            vendor: Advanced Micro Devices [AMD]
            physical id: 1
            bus info: cpu at 0
            version: 15.4.2
            size: 2GHz
            capacity: 2GHz
            width: 64 bits
            capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt x86-64 3dnowext 3dnow up pni lahf_lm cpufreq
  
+ 
+ -----
  Replication:
- -----
- try:
+ 
+ You can try:
  # sudo apt-get install stress
  # stress --cpu 16 --vm 2 --vm-bytes 128M
  
  But it may be the graphics card (gpu), connected to the same heat sink
- as the cpu, that causes the shutdown. (The gpu only overheating when cpu
- fan is not running fast enough.)
+ as the cpu, that causes the shutdown. And the gpu only overheating when
+ cpu is not getting stressed/hot and the fan is not running fast enough
+ to keep the gpu from overheating.
  
+ 
+ -----
  Workarounds:
- -----
+ 
+ 
  Make sure heatsink is not dusty (Pressured air/vacuum at own risk).
  
- In some cases loading some additional kernel modules seemed/used to work around the problem.
+ In some cases loading some additional kernel modules seemed to/used to work around the problem.
  http://ubuntuforums.org/showthread.php?s=cb341b218b0f159c552006cac37a6632&t=1312317
  
  Comment #308 points out how with ati graphics cards supported by fglrx
  driver you can disable its acpi functions as a workaround.
  
-     Possible /etc/X11/xorg.conf for non-fglrx users:
+ A possible /etc/X11/xorg.conf to keep the gpu cooler:
  
          Section "Screen"
     Identifier	"Configured Screen Device"
         Device	"Configured Video Device"
          EndSection
  
          Section "Device"
     Identifier	"Configured Video Device"
     Option "ClockGating" "true"
     Option "DynamicPM" "true"
     Option "DynamicClocks" "on"
          EndSection
  
- Comment #327 points to the "server" edition which has no acpi and does
- not suffer from this bug, as well as to a blog post linking to
- summaries. http://designbygravity.wordpress.com/2009/12/01/how-linux-
- almost-drove-me-to-windows-xp/
+ Comment #327 points to the "server" edition which does not use acpi and
+ does not suffer from this bug.
  
- If your fan does not start at all, but in overheating conditions:
+ 
+ ----
+ You are seeing another issue if your fan does not start at all, but in emergency overheating conditions:
  
  Comment #328 points out updating BIOS to latest version and adding
  "acpi.power_nocheck=1" (https://patchwork.kernel.org/patch/23156/)
  option to boot line may help.
  
- In this situation also staying 10 seconds or so in the grub boot menu
+ With this issue also staying 10 seconds or so in the grub boot menu
  until the fan starts controlled by the bios can help.

-- 
laptop overheats and suddenly shuts down/off
https://bugs.launchpad.net/bugs/370173
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