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Re: grub2 code

From: Ben Guthro
Subject: Re: grub2 code
Date: Mon, 3 Feb 2014 07:42:11 -0500

On Mon, Feb 3, 2014 at 6:57 AM, Colin Watson <address@hidden> wrote:
> On Sun, Feb 02, 2014 at 07:25:51PM +0000, Robert Parnell wrote:
>> I was just looking at the grub2 source code and saw that
>> <>
>> says to contact with questions.
>> I was looking at the source because I encountered a bug on my machine
>> that has been previously reported
>> ( and
>> thought I'd have a look to see if I could find the problem.
>> So I have 2 questions:
>> 1. Is the code on launchpad the up to date code?
> It's an automatically-imported version of the Ubuntu packaging.  It's
> up-to-date with what we're shipping, yes, but we do our work in git
> these days.  The upstream code is here:
> ... and the packaging used by both Debian and Ubuntu is here (the
> "experimental" branch is most current):
>> 2. Line 177 of
>> <>
>> is a function that flushes the keyboard buffer, could this be what is
>> causing the bug?
> That seems unrelated.
> Ben's patch referenced in touches
> code that I wrote and that I maintain as a patch, so this would
> presumably be my problem to fix.  But I don't understand why Ben's patch
> fixes anything related to NumLock.  The code being commented out is
> essentially:
>         movw    $(GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR + 0x17), %bx
>         andb    $3, (%bx)
> ... followed by something that tests the condition flags.  But all that
> does is test whether either Shift key is held down, not actually set the
> NumLock state (see  That is,
> it reads from the BIOS Data Area, but it doesn't write to it.
> Ben (CCed), could you shed some light on why your patch would fix this?

Adding Roger Cruz, as he was the original author of this fix, where I
was just trying to get it upstreamed - though, this was quite some
time since he developed it (Oct 2011), so I'm sure this isn't exactly
fresh in his mind.

Roger, could you shed some light on  this?


> Thanks,
> --
> Colin Watson                                       address@hidden

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