Re: IRQ Conflicts ?
On Fri, 11 Jan 2002, Cassandra Lynette Ludwig wrote:
> Not wishing to start a debate, but just setting some facts straight here
> On Thu, 10 Jan 2002, Erik Mouw wrote:
> > Hmm, that's probably not good, I think your laptop has a CardBus
> > bridge, not the old 82365 PCMCIA bridge. The 2.4 kernels have the
> > yenta_socket module for CardBus bridges, my experience is that
> > linux-2.4 has much better support for the exotic hardware found in
> > laptops.
> Erik, would you perhaps explain therefore to me why almost 60% of the
> hardware in my laptop ceases to function if I run a 2.4 kernel, but work
> flawlessly with a 2.2 kernel (2.2.20 basline debian is my currently
It may be due to the implementation from the yenta_socket module in direct
kernel support. I switched from 2.2.19 + pcmcia package to 2.4.14 and for
my thinkpad everything works.
> The biggest problems I had with 2.4 was PCMCIA - No functionality at all.
> No matter what pcmcia device I used it
> failed miserably, and yes, I did try running the yenta socket driver,
> which is the correct one for this laptop.
> DOCK - Pretty much all the dock devices ceased to function with the 2.4
> Now, I mainly run my laptop docked, and I use a wireless PCMCIA network
> card, therefore in regards to the "much better support" that 2.4
> supposedly has - not in my case. Oh, and I have a fully updated Toshiba
> Tecra 8000.
> And one more thing - until the 2.4 kernel is truly stable as far as the
> Debian testing process is concerned (in other words until it becomes the
> default kernel), you won't ever find me running it in a production system
> that is more important than my laptop. I wanted to use it on that, but it
> failed miserably, I therefore refuse to trust it on a production server.
There has been some touble when changing things like memory management in
the 2.4 series. But I am using it since 3 month on various production
systems and it runs perfectly stable. But of course, not with experimental
drivers and on commonly known SCSI X86 hardware.
> However, I do know a few people who happen to be running the 2.4 kernel in
> a sufficiently useful (to them) level... most of them are being very
> careful about what hardware they use - namely they are keeping clear of
> SMP in the 2.4 kernel revs (apparently some code in the 2.4 SMP listing
> can break things like RAID), and various old hardware support (like well,
> the Toshiba laptop's PCMCIA controller).
> In final note - the 2.2.20 kernel has a Cardbus driver for the PCMCIA
> controllers, this works quite well, and if you don't need to upgrade the
> kernel for some other reason (for instance, you install RH7.1/7.2 *duck*),
> then you should not do so... unless of course you have spare time to
> devote to kernel testing... in which case you already know of the
> potential risks... I hope :-)
> Unfortunately, I seem to have missed the whole 2.3 kernel in this
> whirlwind rush to upgrade kernels.... I know it exists... but people seem
> to think that a bleeding edge kernel is more important than a working
If an operating system does not support needed features, it may not be
successful anymore (the 2.4 soft-RAID code has improved a lot, there are
usable journaling file systems, NFS and Quota are well implemented ....)
> PS - The other PCMCIA driver is tcic. My laptop has a multi-mode PCMCIA
> controller, which will work with either device, depending upon the setting
> I have the controller in.
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Linux is user friendly, it's just a bit picky about it's friends....
Institute for Clinical Radiology
University of Heidelberg
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