[Linux-parport] The Intel parport bug

Adam Baker adam at baker-net.org.uk
Thu Jun 16 16:12:17 EDT 2011

On Wednesday 15 Jun 2011, Leopold Palomo-Avellaneda wrote:
> Package: linux-image-2.6
> Severity: normal
> Tags: patch
> Hi,
> there's a bug in the parport module that have been reported (in another
> places) some time ago [1]. Also, this bug was reported at Redhat [2], but
> nobody follow the report and it was closed.
> As Adam baked said [1] :
> <quote>
> A long time ago (~ 10 years), Intel produced a chipset that
> included broken EPP support. The Linux parport driver was written to detect
> such a chipset and disable EPP support on it. Unfortunately the test that
> was written gives false positives for many current chipsets and no-one
> seems to know exactly what the problem hardware was, let alone have a
> sample of it to see if a better test can be written. After such a long
> time it is probably appropriate to just remove the test (on average it
> does more harm than good) however you are correct in asserting the driver
> is unmaintained so no-one is bothering to fix it.
> </quote>
> I have applied the patch to the standard debian kernel and it compiles and
> runs perfectly. Applied to some Dell hardware, now the EPP mode is detected
> and, after some initial tests it's working.
> I don't have any hope that it would be solved in the linux kernel, but at
> least in the debian kernel it could be applied.
> Please, apply the patch.

The reason I gave up on trying to get this into the mainline kernel was 
because I binned the only hardware I had that used EPP and I needed at least 
one and preferably more people to confirm this was an effective fix for a real 
world problem, not just something that happened to once work for me.

As the parport driver is currently orphaned you need to post a patch to the 
LKML if you want to get it included in mainline but if your prepared to do 
some testing that would be the best solution for everyone.


More information about the Linux-parport mailing list