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.
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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
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