bug#6392: 24.0.50; Switching to emacs window reports "<Scroll_Lock> is undefined"

bug#6392: 24.0.50; Switching to emacs window reports "<Scroll_Lock> is undefined"

[Tim Van Holder]

I'm running emacs on an (old) debian box from an ssh session, with X
forwarding set up to Cygwin's X windows.

Since updating to this morning's bzr trunk (but still the case after a
bzr update 15 minutes ago), starting up emacs gives an error
"<Scroll_Lock> is undefined". This error is repeated when the emacs
window receives the focus (after Alt-TAB). It is quite annoying since I
tend to go back and forth between windows a lot.

Happens with emacs -Q too, so does not seem to be a customization issue.

I tried
  (global-set-key [Scroll_Lock] nil)
and
  (global-set-key [Scroll_Lock] 'do-nothing)
but neither had any effect whatsoever.


As an aside, I see that [C-q TAB] inserts a NUL character before the
TAB. It does not happen for all characters; others that seem to get a
NUL are [return], [ESC] (which inserts the NUL but then treats the ESC
as a keypress rather than inserting an escape character).


In GNU Emacs 24.0.50.10 (i686-pc-linux-gnu, GTK+ Version 2.8.20)
 of 2010-06-10 on leeloo
Windowing system distributor `The Cygwin/X Project', version 11.0.10503000
configured using `configure  '--with-x''

bug#6392: Scroll Lock state was on

[Tim Van Holder]

Hmm. Looks like my keyboard's Scroll Lock state was enabled at the time.
Still a bit annoying that emacs complained about this every single
time it received the focus though (no other apps do).
If this is intentional and/or necessary behaviour, then I guess this
bug can be closed.

bug#6392: Scroll Lock state was on

[Stefan Monnier]

> Hmm. Looks like my keyboard's Scroll Lock state was enabled at the time.

Good to know, thanks.

> Still a bit annoying that emacs complained about this every single
> time it received the focus though (no other apps do).

Obviously.

> If this is intentional and/or necessary behaviour, then I guess this
> bug can be closed.

No, it's not intentional and I don't think it's necessary either.


        Stefan

bug#6392: Scroll Lock state was on

[Tim Van Holder]

With this morning's bzr trunk this seems to have gone away; pressing
the key with Emacs still has the message, but that's perfectly normal.
The message is no longer issued when switching to/from Emacs, nor when
starting Emacs with scroll lock enabled.

bug#6392: Scroll Lock state was on

[Tim Van Holder]

On 18 June 2010 10:20, Tim Van Holder <tim.vanholder@gmail.com> wrote:
> With this morning's bzr trunk this seems to have gone away; pressing
> the key with Emacs still has the message, but that's perfectly normal.
> The message is no longer issued when switching to/from Emacs, nor when
> starting Emacs with scroll lock enabled.

Looks like I was premature. I just switched to emacs from Vista (a
3270 terminal emulator; probably the reason Scroll Lock is on to begin
with) and it hit the error again.
Given that when I tested it this morning (explicitly
enabling/disabling Scroll Lock via the keyboard) things were working,
it may be specifically related to Scroll Lock being enabled
programmatically. It may also be specific to my use case (i.e. using
Cygwin's X server via SSH tunnelling).
I'll try to do some tests next Monday.

bug#6392: Scroll Lock state was on

[Stefan Kangas]

Tim Van Holder <tim.vanholder@gmail.com> writes:

> On 18 June 2010 10:20, Tim Van Holder <tim.vanholder@gmail.com> wrote:
>> With this morning's bzr trunk this seems to have gone away; pressing
>> the key with Emacs still has the message, but that's perfectly normal.
>> The message is no longer issued when switching to/from Emacs, nor when
>> starting Emacs with scroll lock enabled.
>
> Looks like I was premature. I just switched to emacs from Vista (a
> 3270 terminal emulator; probably the reason Scroll Lock is on to begin
> with) and it hit the error again.
> Given that when I tested it this morning (explicitly
> enabling/disabling Scroll Lock via the keyboard) things were working,
> it may be specifically related to Scroll Lock being enabled
> programmatically. It may also be specific to my use case (i.e. using
> Cygwin's X server via SSH tunnelling).
> I'll try to do some tests next Monday.

That was 10 years ago.  Are you still seeing this on a modern version
of Emacs?

Best regards,
Stefan Kangas

bug#6392: Scroll Lock state was on

[Stefan Kangas]

Tim Van Holder <tim.vanholder@gmail.com> writes:

> I’m out of the country and won’t be able to test quickly. Given the ticket’s age, assume the problem has gone away; I can always refile if I should run into it again.

Thanks, closing the bug with this message.

Best regards,
Stefan Kangas