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063eb6743cd0d98dd52d1a9559b804381ee5144d
When a driver uses a crtc during device detection, the scrn has not yet been configured and virtualX/virtualY are still zero. This caused the X server to try and allocate a shadow frame buffer, which couldn't work. Detect this by checking for zero virtualX/virtualY values. Signed-off-by: Keith Packard <keithp@keithp.com>
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Truly free fork of the XOrg project.
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