https://bugzilla.kernel.org/show_bug.cgi?id=12878





--- Comment #111 from H. Peter Anvin <h...@zytor.com>  2012-10-22 22:14:10 ---
OK, I guess what happens is that the bootloader (or possibly the BIOS) probably
enables E820 via port 92h whereas the BIOS expects it to have been enabled via
the KBC.  There is a reason the Linux code does the order BIOS, KBC, port 92h
even though port 92h is faster.

What I'd like to know is if calling enable_a20_bios() unconditionally works on
your system (i.e. disable the first a20_test_short() only?)

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