[Chimera-users] Chimera crashes when saving image

Tom Goddard goddard at cgl.ucsf.edu
Fri May 1 17:09:27 PDT 2009

Hi Victor,

  This appears to be a linux graphics driver problem that you see when 
using new Chimera 1.4 image saving code that uses off-screen OpenGL 
PBuffers to capture images.  Chimera 1.3 saves images directly from your 
screen and will not have this problem.  You can also make Chimera 1.4 
use the older image saving technique by starting Chimera on linux with 
"chimera --debug-opengl", then turning off the Pbuffer switch in the 
opengl debug dialog that appears at startup.  Greg Couch in our lab is 
working on the Pbuffer code and can provide more advice next week.


Victor Alves wrote:
> Hi
> I am using Chimera alpha 1.4 build 27395 in Ubuntu 9.04 Jaunty 32 bits
> version, in a laptop with Core2Duo at 2.4GHz each core, 4 Gb RAM.
> When I use Save Image, sometimes if I increase the size of the image or
> increase supersmple values, Chimera will crash with this terminal message:
> X Error of failed request:  GLXBadPbuffer
>   Major opcode of failed request:  128 (GLX)
>   Minor opcode of failed request:  28 (X_GLXDestroyPbuffer)
>   Serial number of failed request:  107906
>   Current serial number in output stream:  107908
> (The last 2 numbers will vary between crashes)
> After restarting Chimera sometimes I can save the image using the same image
> specifications, other times it will keep crashing and only reducing the size
> or the Supersample numbers, I can save the image.
> Is this laptop not powerful enough?
> Do you need more information?
> Should I try another build?
> Thank you in advance
> Victor Alves
> PS: My first message to the BB, so congratulations to the developers for an
> excellent piece of software.
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