On Tue, 28 Aug 2001, Juri Haberland wrote:
>
> after a lot of compiler and fsck runs and with the kdb-patch from Eric I
> narrowed it down to the kdb patch in conjunction with apm. If I enable
> apm _and_ the kernel option "Enable console blanking using APM" the
> system hangs when switching from X to the console (via CTRL-ALT-F1).
>
> The XFS kernel without kdb is fine.
>
> First I thought it must be the frame-buffer console stuff but it wasn't.
>
> Hope that helps a bit.
I just a few weeks ago had to install a new kernel to a few hundred
machines, since I had accidentally enabled "Enable console blanking using
APM" switch.
There are lots of motherboards around which have somewhat broken APM
support or at least do not work correctly with Linux APM. Many of these
machines just hang, when console blanking or unblanking using APM is
attempted. This is not XFS spesific and is not even 2.4 kernel spesific.
Most of those few hundred machines I had to update were running 2.2.19
kernel. You just should not enable console blanking using APM, unless you
are running a laptop machine and you are sure that it actually works.
With PC workstations or servers the plain VESA screen blanking support
works very well, so the APM support is not very useful anyway. And most
good laptops are smart enough to do screen blanking themselves without
any help from Linux kernel.
- Jani
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