[Bug 65442] [HSW IVB ILK SNB bisected] I-G-T/testdisplay -f cause "*ERROR* mismatch in adjusted_mode.flags"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65442

--- Comment #13 from Imre Deak <imre.deak at gmail.com> ---
Created attachment 82997
  --> https://bugs.freedesktop.org/attachment.cgi?id=82997&action=edit
sanitize requested sync polarity flags

This seems to be caused by testdisplay requesting a mode without either
negative or positive polarity (mode.flags=0). All intel encoders treat this to
mean negative polarity. The mode state readout/checker code otoh expects
exactly one of the polarity bits to bet set. The attached patch is one way to
fix this, could you give it a go?

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