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Message-ID: <6101e8c40802160632y2723ccc3xb0940b9aebfa20f5@mail.gmail.com>
Date: Sat, 16 Feb 2008 15:32:06 +0100
From: "Oliver Pinter" <oliver.pntr@gmail.com>
To: "Andrew Buehler" <abuehler.kernel@gmail.com>
Subject: Re: USB regression (and other failures) in 2.6.2[45]*
Cc: linux-kernel@vger.kernel.org, "Andrew Morton" <akpm@linux-foundation.org>,
       "Greg KH" <greg@kroah.com>, linux-scsi@vger.kernel.org,
       linux-usb@vger.kernel.org
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add CC (Andrew, Greg and linux-usb)

On 2/15/08, Andrew Buehler <abuehler.kernel@gmail.com> wrote:
> In my workplace, I use a customized version of Novell's ZENworks imaging
> boot CD, which is based off of Linux. I have one particular model of
> laptop - the IBM/Lenovo R61 - on which three different things fail
> completely in current kernels (tested with 2.6.24.2 and 2.6.25-rc1):
> USB, AHCI (and thus access to the SATA drive), and networking. As a
> consequence of all three failing in parallel, I have no practical way to
> get logs and other information off of the machine to help with tracking
> down the bugs.
>
> I am primarily concerned about the AHCI and networking issues, since
> they are what need to be working in order for us to do what we need to
> with these boot discs and these laptops. However, I intend to focus on
> the USB issue first, because it seems slightly more tractable and fixing
> it would allow me to reliably get logs off of the computer so as to
> provide information to help track down and fix the other problems.
>
> Specifically, the USB issue is more tractable in that I have found one
> narrow set of circumstances in which I *can* get it to work, and so have
> been able to obtain an lspci log and a dmesg log from the failing
> laptop. I seem to remember the lkml FAQ advising not to simply attach
> such files unsolicited, so I have not provided them here, but I am more
> than willing to send them (and the matching .config file) along upon
> request. Instead, I will do my best to summarize the errors as I have
> observed them, though that best may be somewhat poor. In the following,
> unless explicitly specified, I am using 2.6.25-rc1, simply because I
> expect that it will be more likely to get attention and fixes than
> earlier (released) versions.
>
>
> Early in the boot process, immediately after the 'io scheduler foobar
> registered' lines, the message
>
> ====
> 0000:00:1a.7 EHCI: BIOS handoff failed (BIOS bug?) 01010001
> ====
>
> appears twice. Despite the parenthetical suggestion, I do not believe
> that the problem could be a bug in the BIOS, because Windows is able to
> access all of the hardware on these laptops - including USB devices,
> which is what I understand EHCI to involve - without the slightest
> difficulty.
>
> If there is no USB Flash drive is connected during the boot process,
> there are no further apparently-USB-related errors during boot that I
> can recognize, and various messages about USB host controllers being
> detected appear; they seem to be perfectly normal. When the boot process
> completes, connecting such a drive produces no visible response
> whatsoever.
>
> If on the other hand there *is* a USB Flash drive connected during the
> boot process, there are many other USB-related messages, some of which
> appear to be errors. I am not certain which are in fact relevant, and
> would prefer not to simply copy-and-paste blindly from the log; if the
> information is necessary, I would prefer to simply provide the entire
> log rather than risk missing something important. However, when the boot
> process is done and the usb-storage module is loaded, the drive is in
> fact recognized and can be mounted, though it is very slow to respond;
> in my one test it took ~20+ seconds to mount the drive (512MB, vfat), an
> unmeasured but quite long time to dump dmesg into a file on that drive,
> a barely noticeable but still present blink to copy /proc/config.gz to
> the drive, and four seconds to unmount afterwards.
>
>
> For reference, I have on hand a version of this same boot disc built
> using kernel 2.6.23.1, which does not produce the EHCI errors, and on
> which the USB drive is usable in exactly the way I expect from a Linux
> system. I have not made a significant attempt to narrow down the point
> at which the functionality broke, but I can do so if desired, though it
> will take some time - the more so as I can test this only while at work,
> and am facing an impending three-day weekend.
>
> (I do not have a working git environment, and do not understand well how
> to set one up, as the mechanics and to some extent the interface
> semantics of git seem to be rather different from those of any VCS with
> which I am familiar. That is, however, the only reason - aside from the
> time involved - why I would be unwilling to track down the exact change
> which caused the regression.)
>
> I am quite certain that I have not provided enough information to
> address the problem. Please let me know what would be necessary, and I
> will do my best to provide it. Additionally, if I have made any major
> flubs (of etiquette or otherwise), please do point them out so that I
> can avoid them in future.
>
> --
>     Andrew Buehler
> --
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>


-- 
Thanks,
Oliver
--
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