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I recently noticed that my ~/.xsession-errors file fills up with the following each second:

Mesa: User error: GL_INVALID_OPERATION in glDrawBuffer(buffer=0x405)
Mesa: User error: GL_INVALID_OPERATION in glReadBuffer(buffer=0x405)
Mesa: User error: GL_INVALID_OPERATION in glDrawBuffer(buffer=0x405)
Mesa: User error: GL_INVALID_OPERATION in glReadBuffer(buffer=0x405)
Mesa: User error: GL_INVALID_OPERATION in glDrawBuffer(buffer=0x405)
Mesa: User error: GL_INVALID_OPERATION in glReadBuffer(buffer=0x405)
Mesa: User error: GL_INVALID_OPERATION in glDrawBuffer(buffer=0x405)
Mesa: User error: GL_INVALID_OPERATION in glReadBuffer(buffer=0x405)

I have no idea what generates these messages since it's not referenced in the code anywhere, so I'm wondering if anyone else have the same problem?

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See this: bugs.launchpad.net/unity/+bug/1092550 –  Treviño Dec 20 '12 at 14:11
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