Here's what I think is happening: the nouveau or nvidia driver kernel module is being loaded when the system boots, since the GPU is on by default. When the test_off.sh script is run, the GPU is forcefully powered off without the driver knowing the state changed and may cause crashes or system instability.
George Shearer suggested disabling the pci device node, and blacklisting the kernel module in his M11X post here: http://forums.fedoraforum.org/showpost.php?p=1402584&postcount=45 echo 0 >/sys/bus/pci/devices/0000:01:00.0/enable echo 1 >/sys/bus/pci/devices/0000:01:00.0/remove echo blacklist nouveau >/etc/modprobe.d/blacklist-nouveau.conf The pci bus address may vary by manufacturer. Another workaround might be to unload nvidia or nouveau modules first thing in the test_off.sh script: lsmod | grep "^nvidia " && sudo rmmod nvidia lsmod | grep "^nouveau " && sudo rmmod nouveau On Tue, Nov 16, 2010 at 1:18 PM, Albert Vilella <[email protected]> wrote: > ccing to the mailing list > > On Tue, Nov 16, 2010 at 4:33 PM, Davion <[email protected]> wrote: > > hello,avilella > > I'm sorry for interupting you so much, but I got a problem with my > > laptop: SONY VAIO Z12 when using acpi_call. Due to I should do something > > in linux environment, I installed ubuntu10.10, and I found it can't turn > > off discrete graphics card, Geforce GT 330M. Then I found this acpi_call. > > After using this module of executing test_off.sh, my ubuntu10.10 seems > > really unstable, even breaks down and I should restart my laptop. I think > I > > should email the auther mkottman for help, but I can't find his address. > > When I visiting github website, I saw you , so I want to ask if you could > > help me to find out what's the problem, or you can tell me mkottman's > email. > > I would appreciate you very much, thank you. > > In addition, my laptop info: I5 540M cpu, Geforce GT 330M, 4G RAM, > SONY > > VAIO Z12. > > ------------------ > > > yours,Davion > > >
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