2009-06-26 11:17:19

by Tj Hariharan

[permalink] [raw]
Subject: kernel stuck at trying to change CPU resolution.


Hi, I have a Pentium-M 1.86GHZ processor Laptop. Standard DELL Latitude
D610. I ran the 2.6.31-rc1 kernel (updated tree as of 10 minutes ago).
The kernel gets stuck at the message saying "Switching to High
resolution mode on CPU0" after about 10 minutes it goes to the next
step, but then continues to get stuck. There is no log, as presumable
this is happening before the kernel fully initialises the harddrive and
passes control to user mode. I am running a non modular kernel with no
major changes made to my configuration since 2.6.27. I have never had
any issues thus far. Since I am using a laptop I am unable to access the
sysrq key (which in my case is not prnt screen, but Fn+PrintScreen, and
Fn key is not read by kernel at all, even after full boot and under
normal conditions). Thank you for your time. I have also attached my
config file.


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2009-07-17 22:37:56

by Andrew Morton

[permalink] [raw]
Subject: Re: kernel stuck at trying to change CPU resolution.

On Fri, 26 Jun 2009 07:16:53 -0400
Tj Hariharan <[email protected]> wrote:

>
> Hi, I have a Pentium-M 1.86GHZ processor Laptop. Standard DELL Latitude
> D610. I ran the 2.6.31-rc1 kernel (updated tree as of 10 minutes ago).
> The kernel gets stuck at the message saying "Switching to High
> resolution mode on CPU0" after about 10 minutes it goes to the next
> step, but then continues to get stuck. There is no log, as presumable
> this is happening before the kernel fully initialises the harddrive and
> passes control to user mode. I am running a non modular kernel with no
> major changes made to my configuration since 2.6.27. I have never had
> any issues thus far. Since I am using a laptop I am unable to access the
> sysrq key (which in my case is not prnt screen, but Fn+PrintScreen, and
> Fn key is not read by kernel at all, even after full boot and under
> normal conditions). Thank you for your time. I have also attached my
> config file.
>

Thanks for the report.

Is this regression still present in 2.6.31-rc3 or later?

If so, do you know if the bug was present in 2.6.30/29/28?

2009-07-18 01:01:48

by Carlos Mafra

[permalink] [raw]
Subject: Re: kernel stuck at trying to change CPU resolution.

On Fri 17.Jul'09 at 15:37:42 -0700, Andrew Morton wrote:
> On Fri, 26 Jun 2009 07:16:53 -0400
> Tj Hariharan <[email protected]> wrote:
>
> >
> > Hi, I have a Pentium-M 1.86GHZ processor Laptop. Standard DELL Latitude
> > D610. I ran the 2.6.31-rc1 kernel (updated tree as of 10 minutes ago).
> > The kernel gets stuck at the message saying "Switching to High
> > resolution mode on CPU0" after about 10 minutes it goes to the next
> > step, but then continues to get stuck. There is no log, as presumable
> > this is happening before the kernel fully initialises the harddrive and
> > passes control to user mode. I am running a non modular kernel with no
> > major changes made to my configuration since 2.6.27. I have never had
> > any issues thus far. Since I am using a laptop I am unable to access the
> > sysrq key (which in my case is not prnt screen, but Fn+PrintScreen, and
> > Fn key is not read by kernel at all, even after full boot and under
> > normal conditions). Thank you for your time. I have also attached my
> > config file.
> >
>
> Thanks for the report.
>
> Is this regression still present in 2.6.31-rc3 or later?
>
> If so, do you know if the bug was present in 2.6.30/29/28?

The above description made me remember about
http://lkml.org/lkml/2007/4/30/464
and
http://lkml.org/lkml/2007/12/14/148

Perhaps it is just coincidence and the bugs are not related, but
I felt the need to point them out just in case.

2009-07-18 13:43:24

by Thomas Gleixner

[permalink] [raw]
Subject: Re: kernel stuck at trying to change CPU resolution.

On Fri, 17 Jul 2009, Andrew Morton wrote:
> On Fri, 26 Jun 2009 07:16:53 -0400
> Tj Hariharan <[email protected]> wrote:
>
> >
> > Hi, I have a Pentium-M 1.86GHZ processor Laptop. Standard DELL Latitude
> > D610. I ran the 2.6.31-rc1 kernel (updated tree as of 10 minutes ago).
> > The kernel gets stuck at the message saying "Switching to High
> > resolution mode on CPU0" after about 10 minutes it goes to the next
> > step, but then continues to get stuck. There is no log, as presumable
> > this is happening before the kernel fully initialises the harddrive and
> > passes control to user mode. I am running a non modular kernel with no
> > major changes made to my configuration since 2.6.27. I have never had
> > any issues thus far. Since I am using a laptop I am unable to access the
> > sysrq key (which in my case is not prnt screen, but Fn+PrintScreen, and
> > Fn key is not read by kernel at all, even after full boot and under
> > normal conditions). Thank you for your time. I have also attached my
> > config file.

Tj, does the kernel boot when you add "nohz=off highres=off" to the
kernel command line ?

Another thing worth a try is to add "hpet=disable" to the kernel command
line. HPET code is the major change in the timers area since 2.6.27.

Thanks,

tglx