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[The Bright Side <899669@xxxxxxxxxxxxxxxxxx>]

I can now say that, when the corruption occurs, as soon as I press
Enter, I am thrown back to the login screen (and then the bug is gone).

I have disabled the automatic login in Ubuntu (btw, changing account
settings crashes Gnome Shell: panel and window decorations disappear,
and it no longer responds to keystrokes like CTRL-ALT-DELETE), because I
figure that if I have to go to the login screen every other time I boot,
I may as well start out there.

Now, when the corruption occurs and I press CTRL-ALT-F1 to F7 to cycle
through the consoles, about half of the screen is cleared, but the
corruption stays.

I clearly remember seeing consoles displayed that way a couple distros
ago: the graphics driver wouldn't properly switch to text mode, and show
garbled pixel junk instead of the console.

I am now almost convinced that when this bug happens, Ubuntu boots into
console mode, but overlays the GUI over the console in some way. I have
no way of telling what the console is saying. There has to be some
message there that explains what's going on.

If anybody is reading this, do you know how where Ubuntu's boot logs
are? Is the log overwritten with each new boot?

** Attachment added: "This is how the screen looks when switching to the console (CTRL-ALT-F1). Photo taken after typing some random garbage to make corruption more visible."
   https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/899669/+attachment/2629499/+files/CTRL-ALT-F1.JPG

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https://bugs.launchpad.net/bugs/899669

Title:
  Screen Corruption and crash after Gnome Shell login

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