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Thread: No vgaswitcheroo in /sys/kernel/debug - why not?

  1. #1
    Join Date
    Jul 2006
    Location
    Aberdeen, UK
    Beans
    50
    Distro
    Ubuntu 12.04 Precise Pangolin

    Question No vgaswitcheroo in /sys/kernel/debug - why not?

    Hi All,

    I've been fighting with my laptop (Asus UL30VT) for the past couple of hours trying to get hybrid graphics working the way I would like - I have tried bumblebee, and found it to work well, but I am not able to use the HDMI output, which is essential for me, as my laptop is connected to my TV for a large portion of the time.

    After reading around a bit, it appears the best solution for me is asus_switcheroo - but I can't get this to work! It all appears to install just fine, but I never get the /sys/kernel/debug/vgaswitcheroo/switch file, so I can never use it! I realise that this is not related to asus_switcheroo itself, but I can't seem to find what the problem is!

    After trying a few different things, I did a fresh install of 12.04, then did the updates. I'm SURE I should be able to get this to work, as others with the same laptop have!

    lspci |grep VGA returns:
    Code:
    00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
    01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce G210M] (rev a2)
    So I definitely have two cards there - seems fine.

    grep -i switcheroo /boot/config-3.2.0-* returns:
    Code:
    /boot/config-3.2.0-29-generic:CONFIG_VGA_SWITCHEROO=y
    /boot/config-3.2.0-31-generic:CONFIG_VGA_SWITCHEROO=y
    So the kernel should contain the vgaswitcheroo module.

    I have the debugfs mounted (it is by default), as I can see other things in there, and
    Code:
    sudo mount -t debugfs none /sys/kernel/debug
    returns:
    Code:
    mount: none already mounted or /sys/kernel/debug/ busy
    mount: according to mtab, none is already mounted on /sys/kernel/debug
    I followed the advice given in this askubuntu question but adding the two lines to initramfs didn't help.

    I've made certain that xserver-xorg-video-nouveau and xserver-xorg-video-intel are installed.

    Any more suggestions? I would really like to get this working, so I can use my laptop the way I would like to! I could just disable the Intel card with the SATA setting in the BIOS, but that slows down the drive a lot!

    Thanks in advance for your help!

  2. #2
    Join Date
    Aug 2011
    Beans
    327
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: No vgaswitcheroo in /sys/kernel/debug - why not?

    Hi have you tried Bublebee, it works well with my Intel/Nvidia graphic card laptop.

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