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blacklist modulename
Modules can contain their own aliases: usually these are aliases describing the devices they support, such as "pci:123...". These "internal" aliases can be overridden by normal "alias" keywords, but there are cases where two or more modules both support the same devices, or a module invalidly claims to support a device that it does not: the blacklist keyword indicates that all of that particular module's internal aliases are to be ignored.