2.6.19-rc <-> ThinkPads, summary

2.6.19-rc <-> ThinkPads, summary

[Adrian Bunk]

As far as I can see, the 2.6.19-rc ThinkPad situation is still 
confusing and we don't even know how many different bugs we are 
chasing...

Below is all the information I have found, plus some questions for the 
four people who reported problems that might hopefully bring us nearer 
to solutions.


Michael S. Tsirkin:
- ThinkPad T60 not coming out of suspend to RAM
- broken by commit cf4c6a2f27f5db810b69dcb1da7f194489e8ff88
  ("i386: Factor out common io apic routing entry access")
- question: Did the post -rc4 arch/i386/kernel/io_apic.c changes fix it?


Ernst Herzberg:
- ThinkPad R50p: boot fail with (lapic && on_battery)
- kernel compiled without cardbus support works
- question: Does reverting  the bisected
            commit 1fbbac4bcb03033d325c71fc7273aa0b9c1d9a03 
            ("serial_cs: convert multi-port table to quirk table")
            fix the problem?
- question: Does reverting commit cf4c6a2f27f5db810b69dcb1da7f194489e8ff88
            ("i386: Factor out common io apic routing entry access") help?
- question: If yes, did the post -rc4 arch/i386/kernel/io_apic.c changes
            fix it?


Hugh Dickins:
- ThinkPad T43p
- booting with "noapic nolapic" didn't make any difference
- reverting commit cf4c6a2f27f5db810b69dcb1da7f194489e8ff88
  ("i386: Factor out common io apic routing entry access") didn't help
- question: Was your bisecting successful?


Martin Lorenz:
- ThinkPad X60: lose ACPI events after suspend/resume
                not every time, but roughly 3 out of 4 times
- question: Does reverting commit cf4c6a2f27f5db810b69dcb1da7f194489e8ff88
            ("i386: Factor out common io apic routing entry access")
            in -rc4 help?
- question: If yes, did the post -rc4 arch/i386/kernel/io_apic.c changes
            fix it?


cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

Re: 2.6.19-rc <-> ThinkPads, summary

[Hugh Dickins]

On Sat, 4 Nov 2006, Adrian Bunk wrote:
> 
> Hugh Dickins:
> - ThinkPad T43p
> - booting with "noapic nolapic" didn't make any difference
> - reverting commit cf4c6a2f27f5db810b69dcb1da7f194489e8ff88
>   ("i386: Factor out common io apic routing entry access") didn't help
> - question: Was your bisecting successful?

Not quite what I'd call successful, but I think I've just about arrived
at some kind of conclusion.

Short summary: forget my complaint, assume it's fixed in current -git.

Boring version:

I think I have two slightly different, perhaps not unrelated, issues.
One manifested in habitual usage, to and from work, suspending for quiet
at home, etc, etc.  As 2.6.19-rc progressed, I more and more often found
it impossible to re-suspend after the first time: suspend key ignored.
rc3 seemed worst, rc4 at first seemed okay, then not, perhaps because...

In order to bisect on this, I had to speed up the testing from a day
or two to a few minutes; and I'm now thinking that this may have
focussed on a different problem.  After several reset bisections
converging on absurd patches (e.g. sparse annotations or unbuilt
sources), I grew even more suspicious of my "good" cases, and
yesterday found even 2.6.18 and 2.6.17 (didn't try earlier) behave
like this: occasionally the suspend key gets ignored for about one
minute (in the few cases I timed).

So whatever I was bisecting on, it's not a regression in 2.6.19.
It may be a software bug, it would be worth fixing if I can work
it out (though the pleasure of bisection was not having to think,
I've grown addicted); but it's not anything to hold up 2.6.19.

And as far as habitual usage goes, experience so far with -gits
post rc4 suggests that that problem has gone away: it's a little
too early to tell for sure, but I've not had to go back to using
2.6.18 to avoid it yet.

Hugh

Re: 2.6.19-rc <-> ThinkPads, summary

[Russell King]

On Sat, Nov 04, 2006 at 04:49:07AM +0100, Adrian Bunk wrote:
> As far as I can see, the 2.6.19-rc ThinkPad situation is still 
> confusing and we don't even know how many different bugs we are 
> chasing...

Why am I copied on this?  Nothing jumps out as being in any area of my
interest (which today is limited to ARM architecture only.)

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core

Re: 2.6.19-rc <-> ThinkPads, summary

[Adrian Bunk]

On Sat, Nov 04, 2006 at 02:04:40PM +0000, Russell King wrote:
> On Sat, Nov 04, 2006 at 04:49:07AM +0100, Adrian Bunk wrote:
> > As far as I can see, the 2.6.19-rc ThinkPad situation is still 
> > confusing and we don't even know how many different bugs we are 
> > chasing...
> 
> Why am I copied on this?  Nothing jumps out as being in any area of my
> interest (which today is limited to ARM architecture only.)

Ernst bisected his problem to your
commit 1fbbac4bcb03033d325c71fc7273aa0b9c1d9a03 
("serial_cs: convert multi-port table to quirk table").

It might be a false positive of the bisecting, but if it turns out to 
actually cause problems it was your commit.

> Russell King

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed