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Why does Gem crash when creating the Gem-window?
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This FAQ applies to: 0.91
When I try to create a Gem-window, my X-server crashes (or worse)?
btw, I am using Ubuntu/hoary with fglrx drivers.
quick
try setting the environment variable GEM_SINGLE_CONTEXT to 1
explanation
Gem establishes an (invisible) openGL-context at startup, even if no Gem-window is created yet. When you create the Gem-window, a 2nd openGL-context is used (which shares some properties with the invisible context).
For some reasons this seems to be not possible with some gfx-drivers (e.g. ATI's proprietary fglrx drivers) and some window-managers (i suspect compiz/beryll), leading to crashes of the X-server and/or system freezes.
The current workaround is to set the environment variable GEM_SINGLE_CONTEXT=1,
which prevents this dual-context magic.
how?
- if you are starting Pd from the bash, you can start Pd/Gem with
GEM_SINGLE_CONTEXT=1 pd -lib Gem - on bash, you can also set this permanently by adding a the line
export GEM_SINGLE_CONTEXT=1to either~/.bashrc(the bash-configuration file in your home-directory) or to/etc/bash.bashrc(to set it for all users)
