[Rd] X11 help please
hin-tak.leung at cimr.cam.ac.uk
Mon Jun 18 13:56:40 CEST 2007
Prof Brian Ripley wrote:
> rgl normally works under Xvfb on Linux: we've been using that for the
> testing 'for ever'.
> However R should not 'crash' on an error in a package, and the X11 device
> has error handlers set up by
> I don't see anything comparable in rgl.
> The error seems to be in the attributes, so I would have a closer look at
> those. In particular, how are you running Xvfb?: you may need something
> Xvfb :5 -screen 0 1280x1024x24 &
> setenv DISPLAY :5
> to ensure that you have a reasonable visual and hence colormap.
> (On my system the default is 12 bit.)
That's interesting - my first thought of Duncan's problem was unusual
colour depth as well, but I thought very few people run their X servers
in anything other than 24-bit or true-color mode these days (and any
MacOSX hardware should be capable of that anyway); if 12-bit is the
Xvfb default it is hightly likely that's the reason.
I have also seen that sort of error messages in CJK related issues,
if the X server's font path has some unsual and broken fonts; so it
might be a good idea to disable any non-english locale, etc and try not
to do anything clever in that direction for the time being.
- I do run my old laptop at 16-bit only, as it is old and I get better
performance that way with little sacrifice on visual appearance,
but that's my choice...
> On Sun, 17 Jun 2007, Duncan Murdoch wrote:
>> The rgl package currently crashes R when running under Xvfb (the
>> "virtual frame buffer" server), at least on MacOSX. It makes sense that
>> it shouldn't be able to work there (it needs interactivity), but I don't
>> know how to detect the problems before they cause the crash.
>> Currently the error happens the first time you try to open an rgl
>> window; when rgl calls XCreateWindow R crashes with the error message
>> X Error of failed request: BadMatch (invalid parameter attributes)
>> Major opcode of failed request: 1 (X_CreateWindow)
>> Serial number of failed request: 28
>> Current serial number in output stream: 29
>> I've checked and as far as I can see all the parameters we're sending to
>> XCreateWindow are valid, but I might have missed something: I don't
>> know much about X11 programming. (The call is
>> ::Window xwindow = XCreateWindow(
>> xdisplay, RootWindow(xdisplay, DefaultScreen(xdisplay)),
>> 0, 0, 256, 256, 0,
>> but without context that's probably not worth much to others.)
>> Are there any experienced X11 programmers out there who can suggest what
>> to do next?
>> Duncan Murdoch
>> R-devel at r-project.org mailing list
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