X2Go Bug report logs - #674
keycode -> keycode translation harmful (makes configuration complex)

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From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Ulrich Sibiller <uli42@gmx.de>, 674@bugs.x2go.org
Subject: Re: [X2Go-Dev] Bug#674: Fwd: Bug#674: Acknowledgement (keycode ->
 keycode translation harmful (makes configuration complex))
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Hi Ulrich,

On  Di 16 Dez 2014 10:40:06 CET, Ulrich Sibiller wrote:

> On Sat, Dec 13, 2014 at 1:45 AM, Robert Siemer  
> <Robert.Siemer@backsla.sh> wrote:
>
>> If the translation is on, you get a skewed setup.
>>
>> Note that the x2go (with the setting of “do nothing”) does a non-perfect
>> copy with the same effect: if the translation is effective, the keyboard is
>> skewed and you are force to load at least “something” to fix XKB. If the
>> translation is off, you “only” need to load XKB configuration if that
>> non-perfect copy annoys you...
>
>> Thanks for the pointer! I had a look at it. As I suspected: the translation
>> is “bad”. Sometimes two different keycodes are translated to the same
>> keycode. How are you supposed to tell them apart on the remote side? You
>> can’t.
>>
>>> It seems some kind of translation from evdev to pc105 is done.
>>
>> The naming is a little funny: the keycodes generated by the kernel before
>> evdev were not called like that, were they?
>
> I don't think so.
>
>>> Do we need to disable setting
>>> up the translation within the nx code to make that work?
>>
>> That would be great as a first step.
>
> I was wondering why this translations had been introduced. It emerged
> between nxagent 3.2.0-10 and 3.3.0-9. The changelog between these
> releases contains (among others) these changes:
>
> nxagent-3.3.0-9
>
> - Changed Keyboard initialization and reset. This change should fix
>   TR11F02129, TR11F02131, TR11F02132.
>
> nxagent-3.3.0-4
>
> - Fix the XKB map load in the case of 64 bit server.
>
> nxagent-3.3.0-3
>
> - Fixed TR10F02119. If the remote X display is using evdev keyboard
>   then copy maps from remote.
>
> nxagent-3.2.0-12
>
> - Fixed TR08E01814. Added shadow keymap initialization in order to
>   enable nxcompshad to translate keycodes across different layouts.
>
> So it MIGHT have been introduced mainly for shadow sessions. The
> TR10F02119 refers to Ubuntu 8.10, which - according to some other
> posts I found - is the version that introduced evdev. So the fix that
> solved evdev problems is causing problems when evdev is enabled.
>
> I also looked at the source and found that clearing the property seems
> to be the only way to disable the translation. (apart from disabling
> XKB completely).
>
> Uli


Note that you can view the changes between versions of nxagent via  
nx-libs.git [1].

Use the "commitdiff" links in the right column...

Mike

[1] http://code.x2go.org/gitweb?p=nx-libs.git;a=shortlog;h=refs/heads/nxagent

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