[Debian-eeepc-devel] eeepc-acpi-scripts + console + gnu screen ↦ staircase?effect

[Damyan Ivanov]

-=| Trent W. Buck, Mon, Apr 12, 2010 at 12:39:02PM +1000 |=-
> Damyan Ivanov <dmn at debian.org> writes:
> 
> > -=| Trent W. Buck, Sun, Apr 11, 2010 at 12:52:01AM +1000 |=-
> >> My normal work environment is Emacs in GNU Screen on the fbcon.  When I
> >> hit e.g. Fn+F11 (the "raise volume" hotkey), eeepc-acpi-scripts writes
> >> output (the new volume) to /dev/console.
> >> 
> >> Unfortunately, doing this in quick succession (e.g. cycling through SHE
> >> states) results in a "staircase" effect.  How do I prevent that?
> >> 
> >> Curiously, output from the kernel (e.g. from plugging in a USB key) does
> >> NOT have the staircase effect.
> >
> > What is a "staircase effect"?
> 
> It's where the receiver expects a ^M but the sender doesn't send one:
> 
> Starting foo... done
>                     Starting bar... done
>                                         Starting baz... done
> 
> Instead of:
> 
> Starting foo... done
> Starting bar... done
> Starting baz... done

Ah, yes, not very nice indeed.

Can you try with the following patch applied?

diff --git a/etc/acpi/lib/notify.sh b/etc/acpi/lib/notify.sh
index b476b53..d602e91 100644
--- a/etc/acpi/lib/notify.sh
+++ b/etc/acpi/lib/notify.sh
@@ -12,7 +12,8 @@ notify() {
     echo "$MSG"  # for /var/log/acpid
 
     if [ ! -S /tmp/.X11-unix/X0 ]; then
-       echo "$MSG" > /dev/console
+        # echo's behaviour wrt "\r" is shell-dependent
+       printf "$MSG\r\n" > /dev/console
        return
     fi
 
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