12.04 backlight issue for Acer Aspire 5734z-4725 running on usb flash drive

Posted by Shawn on Ask Ubuntu See other posts from Ask Ubuntu or by Shawn
Published on 2012-09-03T02:05:01Z Indexed on 2012/09/03 3:48 UTC
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12.04

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live-usb

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acer

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backlight

I have followed the fix found here: Backlight Issue

However I can't use the sudo update-grub2 command as it errors with /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).

As this laptop's hard drive is shot, I can't install the OS. I have been able to get it to temporarily work with sudo setpci -s 00:02.0 F4.B=00.

I'm new to Ubuntu, so if you know how to fix this please provided as much detail to what I would need to do.

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