Ubuntu used a patch for this, but it's just a work-around for now and multiple upstream's developers told me that is not the right approach to use. -- debbug#555134 ...
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ID Status Resolution Sev Product Comp Assignee Reporter Summary
44736 NEW --- nor Sisyphus playonli grenka qwetwe Пустое черное окно при запуске Steam

File a new bug in the "playonlinux" component of the "Sisyphus" product