# replace the entire stv0900_carr_get_quality function around line 672

static s32 stv0900_carr_get_quality(struct dvb_frontend *fe,
					const struct stv0900_table *lookup)
{
	struct stv0900_state *state = fe->demodulator_priv;
	struct stv0900_internal *intp = state->internal;
	enum fe_stv0900_demod_num demod = state->demod;

	s32	c_n = -100,
		regval,
		imin,
		imax,
		i,
		noise_field1,
		noise_field0;

	//dprintk("%s\n", __func__);

	if (stv0900_get_standard(fe, demod) == STV0900_DVBS2_STANDARD) {
		noise_field1 = NOSPLHT_NORMED1;
		noise_field0 = NOSPLHT_NORMED0;
	} else {
		noise_field1 = NOSDATAT_NORMED1;
		noise_field0 = NOSDATAT_NORMED0;
	}

	if (stv0900_get_bits(intp, LOCK_DEFINITIF)) {
		if ((lookup != NULL) && lookup->size) {
			regval = 0;
			msleep(5);
			for (i = 0; i < 16; i++) {
				regval += MAKEWORD(stv0900_get_bits(intp,
								noise_field1),
						stv0900_get_bits(intp,
								noise_field0));
				msleep(1);
			}

			regval /= 16;
			imin = 0;
			imax = lookup->size - 1;
			if (INRANGE(lookup->table[imin].regval,
					regval,
					lookup->table[imax].regval)) {
				while ((imax - imin) > 1) {
					i = (imax + imin) >> 1;
					if (INRANGE(lookup->table[imin].regval,
						    regval,
						    lookup->table[i].regval))
						imax = i;
					else
						imin = i;
				}

				c_n = ((regval - lookup->table[imin].regval)
						* (lookup->table[imax].realval
						- lookup->table[imin].realval)
						/ (lookup->table[imax].regval
						- lookup->table[imin].regval))
						+ lookup->table[imin].realval;
			} else if (regval < lookup->table[imin].regval)
				c_n = 1000;
			c_n = c_n << 8;
			dprintk("%s, regval = %d, snr = %d.%d dB, c_n = %d\n", __func__, regval, (c_n/256)/10, (c_n/256)%10, c_n);
		}
	}

	return c_n;
}

# replace the entire stv0900_read_snr function, around line 768 of stv0900_core.c

static int stv0900_read_snr(struct dvb_frontend *fe, u16 *snr)
{
	s32 snrlcl = stv0900_carr_get_quality(fe,
			(const struct stv0900_table *)&stv0900_s2_cn);
	//snrlcl = (snrlcl + 30) * 384;
	 if (snrlcl < 0)
		snrlcl = 0;

	if (snrlcl > 65535)
		snrlcl = 65535;
	*snr = snrlcl;
	return 0;
}