For the Lenova B575 this problem also occurs with Ubuntu 11.10 beta 2 using kernel 3.0.0-11-generic x86_64. Booting with live CD is OK except that grub menu is unreadable (like with 11.04). Upon shutdown the computer continues apparently without error until the message: "Please remove installation media and close the try then press ENTER:"
At this point it is possible to switch among the virtual terminals but no virtual terminal is responsive. Once enter is pressed the system becomes totally unresponsive and does NOT poweroff.
For the Lenova B575 this problem also occurs with Ubuntu 11.10 beta 2 using kernel 3.0.0-11-generic x86_64. Booting with live CD is OK except that grub menu is unreadable (like with 11.04). Upon shutdown the computer continues apparently without error until the message: "Please remove installation media and close the try then press ENTER:"
At this point it is possible to switch among the virtual terminals but no virtual terminal is responsive. Once enter is pressed the system becomes totally unresponsive and does NOT poweroff.