I have not installed any games for now, but at startup Steam gives me this message:
OpenGL GLX context is not using direct rendering, which may cause performance problems.
For more information visit [https://support.steampowered.com/kb_article.php?ref=9938-EYZB-7457]">[https://support.steampowered.com/kb_art] … -EYZB-7457.
This happens on my PC with ATI Radeon HD 5850, with no proprietary drivers installed (everytime i put them, my systems broke)
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