linux-kernel - Re: I'd like to donate a MacBook Pro

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Date:   Wed, 3 May 2017 20:34:19 -0600
From:   Alex Henrie <alexhenrie24@...il.com>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: I'd like to donate a MacBook Pro

2017-05-03 8:58 GMT-06:00 Joerg Roedel <jroedel@...e.de>:
> On Wed, May 03, 2017 at 08:35:47AM -0600, Alex Henrie wrote:
>> 2017-05-03 5:58 GMT-06:00 Greg KH <gregkh@...uxfoundation.org>:
>> > On Tue, May 02, 2017 at 10:55:09PM -0600, Alex Henrie wrote:
>> >> Today I ran a regression test to determine which commit made the
>> >> keyboard stop working entirely. The last commit that worked for me was
>> >> c09e22d5370739e16463c113525df51b5980b1d5. After that, there is a long
>> >> series of commits where the screen stays black, and after that, I
>> >> start getting errors like the one above.
>> >
>> > So git bisect said that commit was a good change, what one was the "bad"
>> > commit that git bisect pointed at?
>>
>> The commit right after that, but it's not clear whether the screen
>> blanking problem was part of the same bug or just another bug that was
>> introduced at about the same time.
>
> That would be 39ab9555c24110671f8dc671311a26e5c985b592:
>
>         iommu: Add sysfs bindings for struct iommu_device
>
> And it introduced a regression when iommu-sysfs entries are accessed.
> This is fixed in a7fdb6e648fb.
>
> Does that commit fix the screen blanking problem?

At a7fdb6e648fb the screen works but the keyboard is broken. I think
that the screen was actually fixed by an earlier commit, but when I
tried to run a regression test to find when the keyboard problem
appeared after the screen was fixed, I gave up because testing each
revision takes about half an hour and the keyboard problem appears to
be somewhat intermittent.

-Alex