Putting the dib7000p device in and out of sleep can trigger a race, 
causing the usb device to stall (-EPIPE), resulting in i2c errors:

DiB0070 I2C write failed
DiB0070 I2C read failed

As a workaround, do not put the device to sleep

Perhaps the dib8000/9000 need the same workaround

---
 drivers/media/usb/dvb-usb/dib0700_devices.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/usb/dvb-usb/dib0700_devices.c b/drivers/media/usb/dvb-usb/dib0700_devices.c
index 1179842..2a3093e 100644
--- a/drivers/media/usb/dvb-usb/dib0700_devices.c
+++ b/drivers/media/usb/dvb-usb/dib0700_devices.c
@@ -774,6 +774,7 @@ static int dib7070_tuner_reset(struct dvb_frontend *fe, int onoff)
 static int dib7070_tuner_sleep(struct dvb_frontend *fe, int onoff)
 {
 	deb_info("sleep: %d", onoff);
+	if (onoff) return 0;
 	return dib7000p_set_gpio(fe, 9, 0, onoff);
 }
 
-- 
1.7.9.5