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-   -   Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging (http://www.linux-archive.org/debian-kernel/643159-bug-663433-udev-does-not-load-acpiphp-thinkpad-t520-although-needed-expresscard-hotplugging.html)

03-11-2012 08:44 AM

Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging
 
reassign 663433 linux-2.6
thanks

On Mar 11, Martin Steigerwald <Martin@Lichtvoll.de> wrote:

> I reported it upstream on kernel.org back then, but maybe it is more
> of a userspace, of a udev issue, cause when the module is loaded
> hot plugging of Express Cards does work as expected.
The module does not provide any aliases for autoloading.

--
ciao,
Marco

Martin Steigerwald 03-11-2012 08:52 AM

Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging
 
Am Sonntag, 11. Mrz 2012 schrieb Marco d'Itri:
> reassign 663433 linux-2.6
> thanks
>
> On Mar 11, Martin Steigerwald <Martin@Lichtvoll.de> wrote:
> > I reported it upstream on kernel.org back then, but maybe it is more
> > of a userspace, of a udev issue, cause when the module is loaded
> > hot plugging of Express Cards does work as expected.
>
> The module does not provide any aliases for autoloading.

Thanks for that ultra quick answer. I am willing to reopen the bug report
at kernel.org if something should be changed upstream and I precisely
understand what it is.

So please advice. Is it sufficient for ask for module aliases being added
upstream? If I know how I can provide the necessary info for my ThinkPad
T520.

Thanks and have a nice sunday,
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7


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Marco d'Itri 03-11-2012 08:53 AM

Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging
 
On Mar 11, Martin Steigerwald <Martin@lichtvoll.de> wrote:

> So please advice. Is it sufficient for ask for module aliases being added
> upstream? If I know how I can provide the necessary info for my ThinkPad
> T520.
I am not familiar with ExpressCard, so I do not know exactly what is
needed.

--
ciao,
Marco

Martin Steigerwald 03-11-2012 08:55 AM

Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging
 
Am Sonntag, 11. Mrz 2012 schrieb Marco d'Itri:
> On Mar 11, Martin Steigerwald <Martin@lichtvoll.de> wrote:
> > So please advice. Is it sufficient for ask for module aliases being
> > added upstream? If I know how I can provide the necessary info for
> > my ThinkPad T520.
>
> I am not familiar with ExpressCard, so I do not know exactly what is
> needed.

No problem. Maybe someone from the Debian kernel team knows. If not I can
also ask upstream.

Sorry for not dropping control@bugs.debian.org.

Thanks,
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7


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Bjrn Mork 03-11-2012 09:00 PM

Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging
 
Martin Steigerwald <Martin@lichtvoll.de> writes:

> Am Sonntag, 11. Mrz 2012 schrieb Marco d'Itri:
>> On Mar 11, Martin Steigerwald <Martin@lichtvoll.de> wrote:
>> > So please advice. Is it sufficient for ask for module aliases being
>> > added upstream? If I know how I can provide the necessary info for
>> > my ThinkPad T520.
>>
>> I am not familiar with ExpressCard, so I do not know exactly what is
>> needed.
>
> No problem. Maybe someone from the Debian kernel team knows. If not I can
> also ask upstream.

The issue has already been discussed among the upstream experts. See e.g.
http://www.spinics.net/lists/linux-pci/msg11140.html
for an explanation why autoloading acpiphp on all machines historically
has been impossible.

Don't know if anything ever came out of this though:
http://www.spinics.net/lists/linux-pci/msg11148.html

If not, then I guess a distribution could add an init script which
checked DMI dates and loaded acpiphp by default on all modern machines.
It's a pity that users have to research this themselves to get
ExpressCard slots working.


Bjrn



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Ben Hutchings 03-11-2012 09:17 PM

Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging
 
On Sun, 2012-03-11 at 23:00 +0100, Bjrn Mork wrote:
> Martin Steigerwald <Martin@lichtvoll.de> writes:
>
> > Am Sonntag, 11. Mrz 2012 schrieb Marco d'Itri:
> >> On Mar 11, Martin Steigerwald <Martin@lichtvoll.de> wrote:
> >> > So please advice. Is it sufficient for ask for module aliases being
> >> > added upstream? If I know how I can provide the necessary info for
> >> > my ThinkPad T520.
> >>
> >> I am not familiar with ExpressCard, so I do not know exactly what is
> >> needed.
> >
> > No problem. Maybe someone from the Debian kernel team knows. If not I can
> > also ask upstream.
>
> The issue has already been discussed among the upstream experts. See e.g.
> http://www.spinics.net/lists/linux-pci/msg11140.html
> for an explanation why autoloading acpiphp on all machines historically
> has been impossible.
>
> Don't know if anything ever came out of this though:
> http://www.spinics.net/lists/linux-pci/msg11148.html
>
> If not, then I guess a distribution could add an init script which
> checked DMI dates and loaded acpiphp by default on all modern machines.
> It's a pity that users have to research this themselves to get
> ExpressCard slots working.

We should build in whichever hotplug drivers can't be auto-loaded.

Ben.

--
Ben Hutchings
For every action, there is an equal and opposite criticism. - Harrison

Bjrn Mork 03-12-2012 07:31 AM

Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging
 
Ben Hutchings <ben@decadent.org.uk> writes:

> We should build in whichever hotplug drivers can't be auto-loaded.

Even if it's known to break some hardware, as Greg KH confirmes in
http://www.spinics.net/lists/linux-pci/msg11140.html
?


Bjrn



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Ben Hutchings 03-12-2012 02:30 PM

Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging
 
On Mon, 2012-03-12 at 09:31 +0100, Bjrn Mork wrote:
> Ben Hutchings <ben@decadent.org.uk> writes:
>
> > We should build in whichever hotplug drivers can't be auto-loaded.
>
> Even if it's known to break some hardware, as Greg KH confirmes in
> http://www.spinics.net/lists/linux-pci/msg11140.html
> ?

This is terrible... there must be some way we can DTRT as it's just not
acceptable to require users to configure this. I was under the
impression that RH had built-in acpiphp and pciehp now... Matthew?

Ben.

--
Ben Hutchings
Life would be so much easier if we could look at the source code.

Matthew Garrett 03-12-2012 02:49 PM

Bug#663433: udev: does not load acpiphp on ThinkPad T520 although it is needed for ExpressCard hotplugging
 
On Mon, Mar 12, 2012 at 03:30:24PM +0000, Ben Hutchings wrote:

> This is terrible... there must be some way we can DTRT as it's just not
> acceptable to require users to configure this. I was under the
> impression that RH had built-in acpiphp and pciehp now... Matthew?

Any hardware that's broken by acpiphp is also broken by Windows. I've
seen no evidence that anything exists in the real world that would be
broken merely by loading this driver.

--
Matthew Garrett | mjg59@srcf.ucam.org


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