what does "+"(preferred) means in xrandr?

[pengyixiang]

hello everyone
What the “preferred" means in xrandr? Is it setted by display hardware? Can we set it manual? If we call “XOpenDisplay” to open default screen and then poll the returned x11_fd, will we interrupted for “preferred" changed? Is there others docs about it? Looking forward to your reply.




Cheers
Pencc

[Aaron Plattner]

"preferred" generally means that the Extended Display Information Data
(EDID) from the monitor indicates that that mode most closely matches
the native timings of the display. All modes listed by RandR for a given
monitor should work with that monitor, but the preferred mode should
work best (for some definition of "best").

RandR will send events when the list of modes for an output changes. To
receive those, you should use XRRSelectInput() to select for them. I
*think* the mask you want it RROutputChangeNotifyMask.

You can get more information about RandR resources and requests in
randrproto.txt:
https://gitlab.freedesktop.org/xorg/proto/randrproto/blob/master/randrproto.txt

hello everyone！
    What the “preferred" means in xrandr?  Is it setted by display
hardware? Can we set it manual? If we call “XOpenDisplay” to open
default screen and then poll the returned x11_fd, will we interrupted
for “preferred" changed? Is there others docs about it? Looking forward
to your reply.
Cheers，
Pencc

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