OK, so sorry for spamming the comments here, but this seems to be happening more and more often, and it's so annoying. I've removed the startup script from my lightdm config in case it was xbacklight screwing up the graphics when I tried to change the backlight level - It happened twice this moring, once after the other. I think this is a Plymouth bug as Plymouth starts garbled too.
OK, so sorry for spamming the comments here, but this seems to be happening more and more often, and it's so annoying. I've removed the startup script from my lightdm config in case it was xbacklight screwing up the graphics when I tried to change the backlight level - It happened twice this moring, once after the other. I think this is a Plymouth bug as Plymouth starts garbled too.