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VGA console blanking code.

Hello,

My system has a rather odd bug - when, after beeing idle for some time, it
tries to blank the console, it leaves untouched those characters which are in
brighter colours.

I suppose the buggy code is somewhere around
linux/drivers/video/console/vgacon.c, though I might be mistaken. 

Can somebody give me a hint where to look for details?

Best regards,
-- 
tadeusz andrzej kadłubowski

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