[Bug 82619] [regression] recent ABI changes in xorg-video-intel (intel_drv.so) breaks dual-head XBMC

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82619

--- Comment #59 from Chris Wilson <chris at chris-wilson.co.uk> ---
XRandR has two calls:

XRRGetScreenResources() and XRRGetScreenResourcesCurrent(). The first forces
the Xserver and kernel do a laborious and expensive hardware probe to see
exactly what is attached. The second, added later when it was realised just how
stupid that was given hardware and kernels that do autodetection of new
hardware, just queries the kernel for the current set of outputs and their
configuration.

xrandr --current uses XRRGetScreenResourcesCurrent(), and does not imply only
querying the current output. It is the right call to use after receiving a
hotplug notification after a XRRNotifyEvent (which is X telling you that the
current configuration has indeed changed). Without --current, the call can take
up to a few seconds to complete and cause the displays to flash (though
typically with good hardware only 0.2-0.5s). Do not use this unless you know
exactly what you are doing at the hardware level.

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