I've just upgraded to Ubuntu 13.04 on my HP dv6, and I've been going through the usual ritual of setting up Bumblebee etc. Since Jupiter is no longer supported, I followed the steps here to install TLP. I also followed the instructions in the Update section of the answer, to add PowerSavingTweaks for Intel Graphics by editing /etc/default/grub to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force i915.lvds_downclock=1 drm.vblankoffdelay=1 i915.semaphores=1"
I then got down to installing e4rat, following the procedure described here. I managed to successfully run e4rat-collect, but I can't complete the rest of the procedure (the e4rat-realloc portion), since I am unable to boot into the single-user mode. The steps I followed are the same as those mentioned in the HTG article. However, the screen goes black, some stuff gets loaded up, the screen gets cleared and then I see a message saying kvm: diabled by bios with the cursor blinking below it.
I have waited for more than an hour, tried Ctrl+Alt+F1, but all to no avail. I have also tried moving single around in that line - before quiet splash, after quiet splash, at the end of the line (after vthandoff). I have even tried deleting the Power Saving Tweak code and replacing it with single, but I get the same result every time. Interestingly, before I started this entire procedure, I had tried to boot into single-user mode and it had worked back then.
nomodeset single? I tried out what you said but it didn't work.