@emigrant: First, try to avoid using bug reports as support forums. Second, you need to make sure you are actually affected by the bug. When your screen turns black, can you switch back to a session with CTRL-ALT-F7 , CTRL-ALT-F8, CTRL-ALT-F9, etc? If so, then you are affected by bug 40011. If not, then re-read this bug and all the duplicates to help verify that you are actually having the exact same problem.
@emigrant: First, try to avoid using bug reports as support forums. Second, you need to make sure you are actually affected by the bug. When your screen turns black, can you switch back to a session with CTRL-ALT-F7 , CTRL-ALT-F8, CTRL-ALT-F9, etc? If so, then you are affected by bug 40011. If not, then re-read this bug and all the duplicates to help verify that you are actually having the exact same problem.