Understanding of Composition call flow in XServer

Thu Feb 27 12:35:55 UTC 2020

Hello,

I'm new to X Server and working on a new feature development. As part of my
job, am going through the composition call flow in X. To study this, i have
added/modified  xf86DrvMsg logs under *xfree86/drivers/modesetting* to
understand the output and crtc initialization and DRM commits and launched
X with the below command on virtual terminal.

sudo startx -- -logverbose 6

But none of the logs are being printed as part of Xorg.n.log file except
these
[  3158.316] (II) intel(0): Uday --- fbdevhw.c : fbdev_open
[  3158.317] (==) intel(0): Uday ----- Default visual is TrueColor
[  3158.318] (II) intel(0): Uday --- xf86RandR12.c : xf86RandR12Init
[  3158.327] (II) intel(0): Uday --- Setting screen physical size to 508 x
285

can some one please help me to check which DDX driver is being invoked to
understand the call  flow from Window manager to the compositor to libDRM ?

Any logs captured development will be very helpful.

Thanks in-advance for your help

Thanks
Uday
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