Error Function ReadFb in framebuffer.c

[vanducnkt]

unsigned int *ReadFb()
{
if (UpdateFbInfo() == -1)
return NULL;

ifndef USEMMAP

if (lseek(fbfd, SEEK_SET, 0) == -1)
{
    perror("lseek failed for framebuffer device\n");
    return NULL;
}
if (read(fbfd, fbmmap, fbsize) == -1)
{
    perror("Framebuffer read failed");
    return NULL;
}

endif

return (unsigned int *)fbmmap;

}

with samsung galaxy tab 3 it work good. but with samsung galaxy tab 2 and nexus 10 it out perror("Framebuffer read failed"); and send buffe black to client.
can you help me fix it ?
Thank you

[ArcsinX]

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