Using 12.04.3 to install and boot up the system, it works well. It will use radeon driver and runs unity 3d without any problems.
So, I think the problem had been fixed by 12.04.3 ** Changed in: linux (Ubuntu) Status: In Progress => Fix Released ** Changed in: linux (Ubuntu Precise) Status: Confirmed => Fix Released ** Changed in: linux (Ubuntu Quantal) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1125610 Title: [Lenovo b475e]: Precise 12.04.2 install fails Status in “linux” package in Ubuntu: Fix Released Status in “linux” source package in Precise: Fix Released Status in “linux” source package in Quantal: Fix Released Bug description: Attempting an install of 12.04.2 precise results in a few major blocking issues. B475e 1: Mainboard LB475B UMA MB SIT 11312-SB 1.0G DIP#1 UEFI BIOS version: HPET18WW (1.03) UEFI BIOS Date 2012-05-29 Problem encountered: Systems hangs while at Ubuntu Splash screen. Will not accept any keyboard activity Steps to reproduce: 1.) Download and Install 12.04.2 to key, cd, or other boot media. 2.) Choose "Install Ubuntu" Option B475e 2: Mainboard LB475B UMA MB SIT 11312-SB 1.7G DIP#5 UEFI BIOS version: HPET09WW (0.09) UEFI BIOS Date 2012-03-15 Problem encountered: Systems hangs while at grub loader after installation: error: no suitable mode found error: no video mode available Also, to control boot menu options an external usb keyboard must be used. Cannot use onboard keyboard. Steps to reproduce: 1.) Download and Install 12.04.2 to key, cd, or other boot media. 2.) Choose "Install Ubuntu" Option 3.) Go through installation process 4.) Remove media 5.) Reboot These machines do not present a problem installing 12.04.1 6.) Wait for machine to attempt to boot from HD. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1125610/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp