Sometime in the last few days, the boot splash screen (shown when you start the computer, not to be confused with the splash screen shown after login) has stopped showing.
I have GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
and it was all working fine before but now I just get a black screen on bootup, followed by the usual login screen. When I shutdown however, the boot splash does show up (and it used to earlier as well).
What could have changed?