Bug#901919: this bug hits hard

[Vladimir Zhuravlev]

Please at the very least spread the word about the 
usercopy_fallback workaround, if the bug cannot be fixed for 
now.

I was also  affected, it took me several hours to find what 
the problem was. There was also an unrelated timidity bug 
that killed sound too in the recent update. So yesterday I 
updated the system and both video and audio went down hard.

By the way, why is this an "important" bug? I think it 
should be classified as "grave" or "critical". It clearly 
broke my system, and made the package unusable.