Syslinux - Jun 2013 - [bug] 5.10: TAB displays only one line of labels

Hello,

As the subject of the email says, pressing TAB from the "boot:" 
prompt displays only one line of labels. But this only happens under 
certain circumstances, not always.

Obviously, to be able to see this problem you need enough labels.

If TAB is pressed as the first step in the "boot:" prompt, then all 
labels are displayed. If any kernel is launched and it returns back 
to the "boot:" prompt and then the first step is to press TAB, then 
all labels are displayed.

But, if any other combination of keys is pressed before TAB, then 
only one line of labels is displayed.

For example:
1_ boot with ISOLINUX 5.10 to the "boot:" prompt;
2_ press ctrl+v (or any letter and delete it back);
3_ now press TAB;

and under these circumstances, only one line of labels is displayed.

Note that in the above point #2, if a letter is typed in, it should 
be also deleted back from the boot prompt before pressing TAB; 
otherwise only the labels starting with that letter are displayed. 
The latter behavior is, of course, normal and expected, but it would 
probably prevent us from showing the issue I'm reporting here.

If more details or tests are required, just let me know.

TIA,
Ady.

On Thu, Jun 13, 2013 at 5:51 AM, Ady <ady-sf at hotmail.com>
wrote:
> Hello,
>
> As the subject of the email says, pressing TAB from the "boot:"
> prompt displays only one line of labels. But this only happens under
> certain circumstances, not always.
>
> Obviously, to be able to see this problem you need enough labels.
>
> If TAB is pressed as the first step in the "boot:" prompt, then
all
> labels are displayed. If any kernel is launched and it returns back
> to the "boot:" prompt and then the first step is to press TAB,
then
> all labels are displayed.
>
> But, if any other combination of keys is pressed before TAB, then
> only one line of labels is displayed.
>
> For example:
> 1_ boot with ISOLINUX 5.10 to the "boot:" prompt;
> 2_ press ctrl+v (or any letter and delete it back);
> 3_ now press TAB;
>
> and under these circumstances, only one line of labels is displayed.
>
> Note that in the above point #2, if a letter is typed in, it should
> be also deleted back from the boot prompt before pressing TAB;
> otherwise only the labels starting with that letter are displayed.
> The latter behavior is, of course, normal and expected, but it would
> probably prevent us from showing the issue I'm reporting here.
>
> If more details or tests are required, just let me know.
Confirmed.  Tested pxelinux.0 from 5.00 and 5.10.  It appears to be an
issue of not having the line wrap in a consistent state.  Returning
from a COM32 module does reset it.

--
-Gene

On Thu, 13 Jun, at 06:38:36AM, Gene Cumm wrote:
> Confirmed.  Tested pxelinux.0 from 5.00 and 5.10.  It appears to be an
> issue of not having the line wrap in a consistent state.  Returning
> from a COM32 module does reset it.
 
Hmmm.. returning from a COM32 module should be resetting it. What steps
did you take to reproduce this problem? I can reproduce it with Ady's
procedure, but not after I've run a module - things seem to reset to a
known good state for me.

-- 
Matt Fleming, Intel Open Source Technology Center