udlfb: Enable fbcon access to framebuffer by default

		Disable when running with X server that supports reporting

		changed regions via ioctl, as this method is simpler,

		more stable, and higher performance.

		default: fb_defio=1

console	Allow fbcon to attach to udlfb provided framebuffers. This

		is disabled by default because fbcon will aggressively consume

		the first framebuffer it finds, which isn't usually what the

		user wants in the case of USB displays.

console	Allow fbcon to attach to udlfb provided framebuffers.

		Can be disabled if fbcon and other clients

		(e.g. X with --shared-vt) are in conflict.

		default: console=1

shadow		Allocate a 2nd framebuffer to shadow what's currently across

		the USB bus in device memory. If any pixels are unchanged,

		do not transmit. Spends host memory to save USB transfers.

		Enabled by default. Only disable on very low memory systems.

		default: shadow=1

Sysfs Attributes

================

MODULE_DEVICE_TABLE(usb, id_table);

/* module options */

static int console;   /* Optionally allow fbcon to consume first framebuffer */

static int console = 1; /* Allow fbcon to open framebuffer */

static int fb_defio = 1;  /* Detect mmap writes using page faults */

static int shadow = 1; /* Optionally disable shadow framebuffer */

}

module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);

MODULE_PARM_DESC(console, "Allow fbcon to consume first framebuffer found");

MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer");

module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);

MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes");