VGA blank causes hang with 2.4.18

VGA blank causes hang with 2.4.18

[Richard Gooch]

  Hi, all. Here's a perverse problem: when the screen blanks (text
console) with 2.4.18, the machine hangs. No ping response, no magic
SysReq response. I didn't have this problem with 2.4.7.

The command I used to configure screen blanking was:
setterm -blank 10 -powerdown 0

This is an Athalon 850 MHz on a Gigabyte GA-7ZM motherboard.

I managed to waste a few hours chasing this, wondering why the machine
hung a while after boot. Of course, I first blamed the jobs that were
started on it soon after boot. Turns out the jobs are not to blame!

				Regards,

					Richard....
Permanent: rgooch@atnf.csiro.au
Current:   rgooch@ras.ucalgary.ca

Re: VGA blank causes hang with 2.4.18

[Keith Owens]

On Thu, 14 Mar 2002 19:52:31 -0700, 
Richard Gooch <rgooch@ras.ucalgary.ca> wrote:
>  Hi, all. Here's a perverse problem: when the screen blanks (text
>console) with 2.4.18, the machine hangs. No ping response, no magic
>SysReq response. I didn't have this problem with 2.4.7.
>
>The command I used to configure screen blanking was:
>setterm -blank 10 -powerdown 0
>
>This is an Athalon 850 MHz on a Gigabyte GA-7ZM motherboard.

Any response with kdb + nmi watchdog + serial console?  Sounds like a
lock problem, kdb + nmi watchdog normally lets you debug those.

Re: VGA blank causes hang with 2.4.18

[Richard Gooch]

Keith Owens writes:
> On Thu, 14 Mar 2002 19:52:31 -0700, 
> Richard Gooch <rgooch@ras.ucalgary.ca> wrote:
> >  Hi, all. Here's a perverse problem: when the screen blanks (text
> >console) with 2.4.18, the machine hangs. No ping response, no magic
> >SysReq response. I didn't have this problem with 2.4.7.
> >
> >The command I used to configure screen blanking was:
> >setterm -blank 10 -powerdown 0
> >
> >This is an Athalon 850 MHz on a Gigabyte GA-7ZM motherboard.
> 
> Any response with kdb + nmi watchdog + serial console?  Sounds like
> a lock problem, kdb + nmi watchdog normally lets you debug those.

This box isn't set up for serial console. It's a production box, and
it's running jobs again :-)

Besides, until kdb is integrated into the kernel, I'm not likely to
use it (yeah, I know, hell will have to freeze over first).

				Regards,

					Richard....
Permanent: rgooch@atnf.csiro.au
Current:   rgooch@ras.ucalgary.ca

Re: VGA blank causes hang with 2.4.18

[Juan]

Richard Gooch escribió:
> 
>   Hi, all. Here's a perverse problem: when the screen blanks (text
> console) with 2.4.18, the machine hangs. No ping response, no magic
> SysReq response. I didn't have this problem with 2.4.7.
> 
> The command I used to configure screen blanking was:
> setterm -blank 10 -powerdown 0
> 
> This is an Athalon 850 MHz on a Gigabyte GA-7ZM motherboard.
> 
> I managed to waste a few hours chasing this, wondering why the machine
> hung a while after boot. Of course, I first blamed the jobs that were
> started on it soon after boot. Turns out the jobs are not to blame!
> 
>                                 Regards,
> 
>                                         Richard....

I have had a similar problem for a long time with different versions of
Linux kernel. 
This problem rarely occurs and it always does when I am in a text
console. MagicSysRq does not help :-(.

Bye!!!!
-- 
D. Juan Piernas Cánovas
Departamento de Ingeniería y Tecnología de Computadores
Facultad de Informática. Universidad de Murcia
Campus de Espinardo - 30080 Murcia (SPAIN)
Tel.: +34968367657    Fax: +34968364151
email: piernas@ditec.um.es
PGP public key:
http://pgp.rediris.es:11371/pks/lookup?search=piernas%40ditec.um.es&op=index

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Re: VGA blank causes hang with 2.4.18

[Alan Cox]

> I have had a similar problem for a long time with different versions of
> Linux kernel.=20
> This problem rarely occurs and it always does when I am in a text
> console. MagicSysRq does not help :-(.

Typical that indicates APM problems. Does the hang occur with APM disabled ?

Re: VGA blank causes hang with 2.4.18

[Richard Gooch]

Alan Cox writes:
> > I have had a similar problem for a long time with different versions of
> > Linux kernel.=20
> > This problem rarely occurs and it always does when I am in a text
> > console. MagicSysRq does not help :-(.
> 
> Typical that indicates APM problems. Does the hang occur with APM
> disabled ?

Might be a while before I can answer that, since long-term jobs are
running on the box again. I can tell you that APM was enabled when
screen blanking hung the box.

				Regards,

					Richard....
Permanent: rgooch@atnf.csiro.au
Current:   rgooch@ras.ucalgary.ca