This affects me as well. Adding my scenario which is similar.
I'm running Ubuntu 15.04 on a Dell XPS 13. I installed with the encrypted LVM option. Typically, I boot, I get the purple screen asking for my encryption passphrase, I put it in, then it goes to the standard login screen.
Now, I boot, I get that purple screen for the passphrase, but I can't seem to type anything. Even if I type my password and click enter, the screen doesn't change. I hold the power button to shut off and then I boot again. This second boot goes straight into Grub. I choose to boot Ubuntu, and it goes to a purple screen for me to enter my passphrase. This screen seems to be a low quality text screen however. I can type my passphrase just fine on this screen and then it goes to Ubuntu's login screen from there.
This affects me as well. Adding my scenario which is similar.
I'm running Ubuntu 15.04 on a Dell XPS 13. I installed with the encrypted LVM option. Typically, I boot, I get the purple screen asking for my encryption passphrase, I put it in, then it goes to the standard login screen.
Now, I boot, I get that purple screen for the passphrase, but I can't seem to type anything. Even if I type my password and click enter, the screen doesn't change. I hold the power button to shut off and then I boot again. This second boot goes straight into Grub. I choose to boot Ubuntu, and it goes to a purple screen for me to enter my passphrase. This screen seems to be a low quality text screen however. I can type my passphrase just fine on this screen and then it goes to Ubuntu's login screen from there.