Comment 139 for bug 1283938

PS: (to my previous comment)

My grub params in /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="noquiet nosplash acpi_osi=Linux acpi_backlight=vendor acpi_sleep=s4_nohwsig loop.max_part=63 loop.max_loop=64"
GRUB_CMDLINE_LINUX=""