I had the same problem with Ubuntu 12.04 and kernel 3.13.0-37-generic This solution working: http://askubuntu.com/questions/169912/fb-conflicting-fb-hw-usage-inteldrmfb-vs-efi-vga-removing-generic-driver
but is incomplette. That helped me to make permanent fix: " --- /etc/grub.d/10_linux 2014-10-22 15:22:09.749586332 +0200 +++ /etc/grub.d/10_linux 2014-10-22 15:08:09.908607933 +0200 @@ -95,9 +95,10 @@ if ! ${recovery} ; then save_default_entry | sed -e "s/^/\t/" - cat << EOF - gfxmode \$linux_gfx_mode -EOF +# comment to fix "fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver" +# cat << EOF +# gfxmode \$linux_gfx_mode +#EOF fi cat << EOF " ther run update-grub, reboot and the error message is gone. SInce the boot hang was occasional i cannot check it immediately, but if it happen with this fix ill report it back. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1296660 Title: Kernel oops: fb: conflicting fb hw usage astdrmfb vs VESA VGA (unable to handle kernel NULL pointer dereference / con_set_unimap+0x32 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1296660/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs