On Fri, 20 Oct 2006 09:30:37 -0700
teunis <[email protected]> wrote:
>
Please don't play with the Cc:s! Just do reply-to-all, thanks.
> Andrew Morton wrote:
> > On Thu, 19 Oct 2006 09:05:49 -0700
> > teunis <[email protected]> wrote:
> >
> >> -----BEGIN PGP SIGNED MESSAGE-----
> >> Hash: SHA1
> >>
> >> Setting the internal clock to 100 Hz stablizes the laptop - and the
> >> synaptics touchpad stops "crashing" (when "crashed" the pad reads out
> >> all kinds of seemingly random values). I would suspect the driver
> >> needs adjusting for the variable clock. Also - it's definitely nicer
> >> on the laptop power use as far as I can tell - should this be in the
> >> documentation?
> >
> > So you're saying that CONFIG_NO_HZ breaks the touchpad?
>
> yes. At least for Acer Travelmate 8000 and HP nx6310 and HP nx7400.
> Other than the touchpad - there is not a lot of common hardware between
> these units. The readout becomes highly unreliable. (in X it starts
> jumping around - it SORT OF resembles the output)
>
> My suspicion is a timing problem in the synaptic USB driver
OK, that's going to be hard to fix and it'd be awkward (and unpopular) to
make inclusion of the dynamic-ticks feature dependent on fixing this.
(Then again, it'd get Ingo into device drivers ;))
However I would suggest that NO_HZ (at least) be dependent upon
CONFIG_EXPERIMENTAL, no?
Also, NO_HZ breaks my laptop (and presumably quite a few others) quite
horridly, which means nobody can ship the feature. Some runtime
turn-it-off work needs to be done there.
> - but I'm
> not familiar with timing on kernels these days. It's been a few years
> since I last really did any kernel work.
>
> >
> >> I'm very grateful that compact flash-based booting on a SATA system
> >> works well. It hasn't been so reliable in 2.6.19-rc2-mm1 for IDE/CF
> >> adaptors but I haven't yet solved why. (tested with various laptops)
> >
> > hm. What goes wrong?
>
> Fails to boot some of the time on SanDisk ultraII 8.0GB and SanDisk
> Extreme IV 8.0GB. The latter is less stable. It crashes during GRUB
> read actually so I haven't been entirely sure it's a kernel problem...
Don't know, sorry.
> >
> >> resume from "suspend to ram" (ACPI S3 mode) - the keyboard and mouse do
> >> not recover on 945G chipset. Note that otherwise the chipset works
> >> well in 2.6.19-rc2-mm1 - and this is the first kernel that does work well).
> >
> > So this might not be a new bug?
>
> A regression. 2.6.19-rc1-git6 seemed to work actually. I couldn't
> get any other kernel to work though... mind you, 2.6.18 worked as well
> although the intel 945G driver did not - so X was operating under VESA only.
So you're saying that there is some patch in the -mm lineup which causes
the keyboard and mouse to die after resume-from-RAM?
What makes you think this is related to the 945G support?
> >> LVM2 - when adding and removing physical volumes (again, on Compact
> >> Flash cards via USB and Firewire adaptors) - it doesn't always remove
> >> the volume properly (pvremove /dev/sda or equiv) from the device-mapper.
> >> This leaves me unable to plug in another. I suspect this to be an
> >> LVM2 problem (no hotplug?) rather than a compact flash or SCSI problem.
> >
> > Can you identify an earlier kernel in which this worked OK?
>
> As far as I can it never has.
>
> I've only tested it with:
> 2.6.16-debian, 2.6.17-debian, 2.6.18, 2.6.19, 2.6.19-rc1,
> 2.6.19-rc1-git4, 2.6.19-rc1-git6, 2.6.19-rc2, 2.6.19-rc2-mm1 (which
> otherwise works quite nicely)
Please try 2.6.19-rc2-mm2: it has a blockdev refcounting fix (well - a
change, at least) which could conceivable help here.
Also, if you're keen,
http://www.zip.com.au/~akpm/linux/patches/stuff/bisecting-mm-trees.txt will
allow us to identify the problematic -mm patches. It would be super-useful
is you could do that.
Thanks.
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