I'd just like to point out that this bug is more than a cosmetic issue,
it has privacy implications, as well.  Anything displayed on screen at
any time may be viewed again minutes, hours, or in some cases days later
by any user.

Usually, it's just a brief 1 second flash, but in extreme cases when
there is lots of I/O activity, the old video memory can be displayed for
minutes at a time.  The worst case I've seen is probably the default KDE
locked screen saver that appears after waking a machine up from suspend
mode.  The slightly garbled contents of old video memory are displayed
for the world to see indefinitely while the screen saver waits for a
user to enter a password.  An account is not even needed to peek at what
was being displayed on screen previously.

-- 
momentary video garbage upon drawing new objects
https://bugs.launchpad.net/bugs/254468
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