2.6.16-rc4: known regressions

2.6.16-rc4: known regressions

[Adrian Bunk]

This email lists some known regressions in 2.6.16-rc4 compared to 2.6.15.

If you find your name in the Cc header, you are either submitter of one 
of the bugs, maintainer of an affectected subsystem or driver, a patch 
of you was declared guilty for a breakage or I'm considering you in any 
other way possibly involved with one or more of these issues.


Subject    : gnome-volume-manager broken on powerpc since 2.6.16-rc1
References : http://bugzilla.kernel.org/show_bug.cgi?id=6021
Submitter  : John Stultz <johnstul@us.ibm.com>
Status     : still present in -git two days ago


Subject    : S3 sleep hangs the second time - 600X
References : http://bugzilla.kernel.org/show_bug.cgi?id=5989
Submitter  : Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>
Status     : problematic commit identified,
             further discussion is in the bug

Subject    : psmouse starts losing sync in 2.6.16-rc2
References : http://lkml.org/lkml/2006/2/5/50
Submitter  : Meelis Roos <mroos@linux.ee>
Handled-By : Dmitry Torokhov <dmitry.torokhov@gmail.com>
Status     : Dmitry: Working on various manifestations of this one.
                     At worst we will have to disable resync by default
                     before 2.6.16 final is out and continue in 2.6.17 cycle.



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: 2.6.16-rc4: known regressions

[Pekka Enberg]

On 2/18/06, Adrian Bunk <bunk@stusta.de> wrote:
> Subject    : gnome-volume-manager broken on powerpc since 2.6.16-rc1
> References : http://bugzilla.kernel.org/show_bug.cgi?id=6021
> Submitter  : John Stultz <johnstul@us.ibm.com>
> Status     : still present in -git two days ago

This is not ppc only. I have the exact same problem on Gentoo
Linux/x86. No ipod events on 2.6.16-rc1, whereas 2.6.15 works fine.
Haven't had the time to investigate further yet, sorry.

                          Pekka

RE: 2.6.16-rc4: known regressions

[Yu, Luming]

>
>Subject    : S3 sleep hangs the second time - 600X
>References : http://bugzilla.kernel.org/show_bug.cgi?id=5989
>Submitter  : Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>
>Status     : problematic commit identified,
>             further discussion is in the bug

The real problem is there are some bugs hidden by ec_intr=0.
ec_intr=1 just get these bug  just exposed, and we need to fix them. 

Thanks,
Luming

Re: 2.6.16-rc4: known regressions

[Adrian Bunk]

On Wed, Feb 22, 2006 at 10:39:01AM +0800, Yu, Luming wrote:
> >
> >Subject    : S3 sleep hangs the second time - 600X
> >References : http://bugzilla.kernel.org/show_bug.cgi?id=5989
> >Submitter  : Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>
> >Status     : problematic commit identified,
> >             further discussion is in the bug
> 
> The real problem is there are some bugs hidden by ec_intr=0.
> ec_intr=1 just get these bug  just exposed, and we need to fix them. 

>From a users' point of view, these are regressions from 2.6.15, and not 
all of them might be fixed in time for 2.6.16.

What is a possible short term solution/workaround for 2.6.16?
Can we go back to default to polling mode in 2.6.16?

> Thanks,
> Luming

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: 2.6.16-rc4: known regressions

[Yu, Luming]

> >Subject    : S3 sleep hangs the second time - 600X
>> >References : http://bugzilla.kernel.org/show_bug.cgi?id=5989
>> >Submitter  : Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>
>> >Status     : problematic commit identified,
>> >             further discussion is in the bug
>> 
>> The real problem is there are some bugs hidden by ec_intr=0.
>> ec_intr=1 just get these bug  just exposed, and we need to fix them. 
>
>From a users' point of view, these are regressions from 
>2.6.15, and not 
>all of them might be fixed in time for 2.6.16.
>
>What is a possible short term solution/workaround for 2.6.16?

ec_intr=0 is a reasonable workaround for this box,
if we couldn't root-cause and fix the real problem on time.

>Can we go back to default to polling mode in 2.6.16?
>

No, don't do this.  There are other laptops need this. And I didn't
get regression report that is root-caused to enabling ec_intr=1 by
default. If you argue bug 5989, 6075 could be,  I think
the truth is, for 5989, we need to fix thermal and processor driver
issue.
for 6075, we need to fix interrupt issue.

So far, I don't think we need o fall back.

Thanks,
Luming

.

Re: 2.6.16-rc4: known regressions

[Adrian Bunk]

On Wed, Feb 22, 2006 at 02:55:10PM +0800, Yu, Luming wrote:
> > >Subject    : S3 sleep hangs the second time - 600X
> >> >References : http://bugzilla.kernel.org/show_bug.cgi?id=5989
> >> >Submitter  : Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>
> >> >Status     : problematic commit identified,
> >> >             further discussion is in the bug
> >> 
> >> The real problem is there are some bugs hidden by ec_intr=0.
> >> ec_intr=1 just get these bug  just exposed, and we need to fix them. 
> >
> >From a users' point of view, these are regressions from 
> >2.6.15, and not 
> >all of them might be fixed in time for 2.6.16.
> >
> >What is a possible short term solution/workaround for 2.6.16?
> 
> ec_intr=0 is a reasonable workaround for this box,
> if we couldn't root-cause and fix the real problem on time.
> 
> >Can we go back to default to polling mode in 2.6.16?
> 
> No, don't do this.  There are other laptops need this. And I didn't
> get regression report that is root-caused to enabling ec_intr=1 by
> default. If you argue bug 5989, 6075 could be,  I think
> the truth is, for 5989, we need to fix thermal and processor driver
> issue.

We do both agree that defaulting to polling mode is not a long term 
solution.

The question is what to do until it's resolved - assuming that issues 
like 5989 might not be fixed in time for 2.6.16.

Breaking setups working with the defaults under 2.6.15 in 2.6.16 doesn't 
sound that good.

> for 6075, we need to fix interrupt issue.

As far as I understand 6075, the submitter already tried ec_intr=0 
without success.

> So far, I don't think we need o fall back.
> 
> Thanks,
> Luming

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