Right, ability to work with built-in config would be excellent :).
#0 fbdev_open (scrnIndex=<value optimized out>, dev=0x1501fc "/dev/fb0", namep=0x0) at fbdevhw.c:412
#1 0x0014fc80 in fbdevHWProbe (pPci=0x0, device=0x0, namep=0x0) at fbdevhw.c:442
#2 0x00c5e4b5 in FBDevProbe (drv=0x8236b00, flags=<value optimized out>) at fbdev.c:394
#3 0x080a7c4e in xf86CallDriverProbe (drv=0x8236b00, detect_only=0) at xf86Init.c:663
#4 0x080a92fe in InitOutput (pScreenInfo=0x8212500, argc=1, argv=0xbfd96fc4) at xf86Init.c:939
#5 0x0806ba2b in main (argc=1, argv=0xbfd96fc4, envp=0xbfd96fcc) at main.c:315
fbdev_open called with namep = 0, that blocks fetch information from efifb
if (namep) {
if (-1 == ioctl(fd,FBIOGET_FSCREENINFO,(void*)(&fix))) {
*namep = NULL;
xf86DrvMsg(scrnIndex, X_ERROR,
"FBIOGET_FSCREENINFO: %s\n", strerror(errno));
return -1;
} else {
*namep = xnfalloc(16);
strncpy(*namep,fix.id,16);
}
}
calling right ioctl from gdb:
(gdb) call ioctl(fd,0x4602,(void*)(&fix))
$2 = 0
(gdb) p fix
$3 = {id = "EFI VGA\0\0\0\0\0\0\0\0", smem_start = 0x80000000 <Address 0x80000000 out of bounds>, smem_len = 6291456, type = 0,
type_aux = 0, visual = 2, xpanstep = 0, ypanstep = 0, ywrapstep = 0, line_length = 4096, mmio_start = 0x0, mmio_len = 0, accel = 0,
reserved = {0, 0, 0}}
shows that efifb prepared right information for frame buffer clients.
the difference between X and X -configure, is vesa driver (it seems) tries to occur information via libint10, assuming existence of VGA BIOS, which ofc is absent in our case.
(II) Loading sub module "vbe"
(II) LoadModule: "vbe"
(II) Loading /usr/lib/xorg/modules//libvbe.so
(II) Module vbe: vendor="
X.Org Foundation"
compiled for 1.6.3.901, module version = 1.1.0
ABI class:
X.Org Video Driver, version 5.0
(II) Loading sub module "int10"
(II) LoadModule: "int10"
(II) Loading /usr/lib/xorg/modules//libint10.so
(II) Module int10: vendor="
X.Org Foundation"
compiled for 1.6.3.901, module version = 1.0.0
ABI class:
X.Org Video Driver, version 5.0
(II) VESA(0): initializing int10
(EE) VESA(0): V_BIOS address 0x0 out of range
(II) UnloadModule: "vesa"
(II) UnloadModule: "int10"
(II) Unloading /usr/lib/xorg/modules//libint10.so
(II) UnloadModule: "vbe"
(II) Unloading /usr/lib/xorg/modules//libvbe.so
(EE) Screen(s) found, but none have a usable configuration.