On Mon, May 6, 2013 at 9:22 AM, Alexander Maret-Huskinson <a...@maret.de>wrote:
> Am Montag, 6. Mai 2013, 10:07:46 schrieb Peter Hutterer:
> > On Sat, May 04, 2013 at 09:32:28PM +0200, Alexander Maret-Huskinson
> wrote:
> > > Hi,
> > >
> > > when using xsetwacom 0.21.0 to set express key shortcuts it is
> possible to
> > > "crash" the wacom driver by setting special keys. The driver will no
> > > longer
> > > respond to any express keys and it is not possible to reset the
> shortcuts
> > > to something else. One has to disconnect and reconnect the tablet to be
> > > able to set or use shortcuts again.
> > >
> > > xsetwacom .... set Button 1 "key shift §"
> > >
> > > ... or ...
> > >
> > > xsetwacom ... set Button 1 "key shift ß"
> > >
> > > ... both will crash the driver as explained above.
> > >
> > > This is a problem because e.g. on a german keyboard, the "ß" is a
> normal
> > > key which does not require any modifiers.
> > >
> > > I tried to work around this problem by converting these special keys to
> > > X11
> > > key symbol names, but it seems, xsetwacom only accepts a very limited
> set
> > > of X11 key symbols.
> > >
> > > It is possible to use "key shift exclam", however "key shift grave"
> does
> > > not work. Instead one has to use the deprecated form "key shift
> > > quoteleft". Also many other key symbols like e.g. "paragraph" don't
> seem
> > > to work.
> > >
> > > Where do I find a list of X11 key symbols which are supported by
> > > xsetwacom?
> >
> >
> http://sourceforge.net/p/linuxwacom/xf86-input-wacom/ci/master/tree/tools/xs
> > etwacom.c#548 it's an obviously incomplete list but the basic approach to
> > this is to call XKeysymToKeycode(XStringToKeysym(<input string>)).
> >
> > The XStringToKeysym() is the key point of failure here, its translation
> > rules are limited. ß isn't recognised, but the symbolic name for it is
> > xsetwacom set ... "key ssharp"
> >
> > and those names you can get from /usr/include/X11/keysymdef.h
> >
> > having said all that, I can't reproduce the 'crash' - xsetwacom bails out
> > for § but I can still set some other config afterwards.
> >
> > Cheers,
> > Peter
>
>
> Thanks for the clarification about the symbols. It seems that on Ubuntu
> 12.04
> not all symbols can be resolved even though they are listed in keysymdef.h.
>
> About the crash:
>
> I experimented some more and it seems that it does not matter which symbols
> you set. If you change an express button shortcut often enough, sooner or
> later the driver will no longer accept any shortcuts nor will it send any
> key
> events when pressing an express button - you have to disconnect and
> reconnect
> the tablet. This is also on Ubuntu 12.04 with xsetwacom 0.21.0.
>
> Funnily it also seems to work if you set invalid shortcuts like "key shift
> ß",
> which are rejected by xsetwacom. Unfortunately I could not find a way to
> reproduce it reliably. Also the number of attempts you need varies a lot.
> Sometimes I can crash the driver by settings two or three shortcuts in a
> row
> (on the same button!), sometimes I need 10 or 20 attempts. It seems to
> crash
> more often when using X11 key symbol names, than when using a-z or 0-9.
>
> If I find the time, I will give it a try on OpenSUSE 12.3 as well and see
> if I
> can get it to crash there, too.
>
Thank you for your testing, Alex! If possible, testing on latest Fedora may
draw most experts' attention ;-).
Ping
> Greetings,
> Alex
>
>
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