No /sys/kernel/debug/vgaswitcheroo after loaded (Ubuntu 12.04)

[mekpro]

I'm using Asus UL30Vt with a fresh install of Ubuntu 12.04 LTS. I tried install the module with "make install-ubuntu", the make process seems fine as i reboot and got these 4 modules loaded.

modprobe -l
...
extra/asus-switcheroo/asus-switcheroo.ko
extra/asus-switcheroo/byo-switcheroo.ko
extra/asus-switcheroo/nouveau-jprobe.ko
extra/asus-switcheroo/i915-jprobe.ko

Also found /sys/module/asus_switcheroo/ directory too.

I'm pretty sure the module had been loaded, The problem, however, is that the path /sys/kernel/debug/vgaswitcheroo doesn't seems to exists at all. I tried adding debugfs to /etc/fstab and its also not work too.

uname -a
3.2.0-24-generic #37-Ubuntu SMP x86_64 GNU/Linux

Apologize my newbie

[awilliam]

Please provide dmesg, the vgaswitcheroo file is only created if there are 2 clients registered (nouveau + intel) and 1 handler, asus-switcheroo. If attempting to use this with the nvidia driver, see notes in README about the dummy-client option.

[mekpro]

So many thanks ! It worked now.

I didn't notice that Ubuntu had automatically install NVIDIA driver for me. I uninstalled it and make sure the nouveau driver had been loaded. The debugfs had appeared now but the switch doesn't seem to have effect.

I then change the /etc/initramfs-tools/modules to skip i915-jprobe out and rerun update-initramfs -k all -u. (According to the readme, i think this module is not needed). Reboot, and worked. I'm not quite sure why.

Thanks again :)

[mekpro]

A little note to anyone about the BIOS settings. For UL30Vt, the harddisk mode must be set to "Enhanced". Make sure of this by running lscpi and you should see 2 VGA Device, Intel and Nvidia.