abi@manjaro ~]$ dmesg | egrep -i "(mantis|dvb)"
[ 10.446368] found a VP-2040 PCI DVB-C device on (03:00.0),
[ 10.446454] Mantis Rev 1 [153b:1178], irq: 16, latency: 32
[ 10.446468] mantis_stream_control (0): Set stream to HIF
[ 10.446526] mantis_i2c_init (0): Initializing I2C ..
[ 10.446542] mantis_i2c_init (0): Disabling I2C interrupt
[ 10.446554] mantis_i2c_xfer (0): Messages:2
[ 10.446561] mantis_i2c_write: Address=[0x50] <W>[ 08 ]
[ 10.446573] mantis_i2c_read: Address=[0x50] <R>[ ff ff ff ff ff ff ]
[ 10.446655] mantis_dma_init (0): Mantis DMA init
[ 10.446671] mantis_alloc_buffers (0): DMA=0x2d120000 cpu=0xed120000 size=65536
[ 10.446685] mantis_alloc_buffers (0): RISC=0x2fa86000 cpu=0xefa86000 size=1000
[ 10.446698] mantis_dvb_init (0): dvb_register_adapter
[ 10.446706] DVB: registering new adapter (Mantis DVB adapter)
[ 10.446708] mantis_dvb_init (0): dvb_dmx_init
[ 10.446787] mantis_dvb_init (0): dvb_dmxdev_init
[ 10.446990] mantis_frontend_power (0): Power ON
[ 10.446999] mantis_gpio_set_bits (0): Set Bit <12> to <1>
[ 10.447011] mantis_gpio_set_bits (0): GPIO Value <ffffffff>
[ 10.549711] mantis_gpio_set_bits (0): Set Bit <12> to <1>
[ 10.549723] mantis_gpio_set_bits (0): GPIO Value <ffffffff>
[ 10.653021] mantis_frontend_soft_reset (0): Frontend RESET
[ 10.653029] mantis_gpio_set_bits (0): Set Bit <13> to <0>
[ 10.653036] mantis_gpio_set_bits (0): GPIO Value <ffffdfff>
[ 10.756335] mantis_gpio_set_bits (0): Set Bit <13> to <0>
[ 10.756345] mantis_gpio_set_bits (0): GPIO Value <ffffdfff>
[ 10.859657] mantis_gpio_set_bits (0): Set Bit <13> to <1>
[ 10.859666] mantis_gpio_set_bits (0): GPIO Value <ffffffff>
[ 10.962979] mantis_gpio_set_bits (0): Set Bit <13> to <1>
[ 10.962993] mantis_gpio_set_bits (0): GPIO Value <ffffffff>
[ 11.319586] vp2040_frontend_init (0): Probing for CU1216 (DVB-C)
[ 11.376016] mantis_i2c_xfer (0): Messages:2
[ 11.376028] mantis_i2c_write: Address=[0x50] <W>[ ff ]
[ 11.376040] mantis_i2c_read: Address=[0x50] <R>[ ff ]
[ 11.376055] mantis_i2c_xfer (0): Messages:2
[ 11.376128] mantis_i2c_write: Address=[0x0c] <W>[ 1a ]
[ 11.376140] mantis_i2c_read: Address=[0x0c] <R>[ ff ]
[ 11.418548] mantis_i2c_xfer (0): Messages:2
[ 11.418558] mantis_i2c_write: Address=[0x50] <W>[ ff ]
[ 11.418570] mantis_i2c_read: Address=[0x50] <R>[ ff ]
[ 11.418586] mantis_i2c_xfer (0): Messages:1
[ 11.418593] mantis_i2c_write: Address=[0x0c] <W>[ 00 33 ]
[ 11.418613] mantis_i2c_xfer (0): Messages:2
[ 11.418620] mantis_i2c_write: Address=[0x0c] <W>[ 1a ]
[ 11.418629] mantis_i2c_read: Address=[0x0c] <R>[ ff ]
[ 11.418647] mantis_dvb_init (0): !!! NO Frontends found !!!
[ 11.418853] mantis_pci_probe (0): ERROR: Mantis DVB initialization failed <-1>
[ 11.418867] mantis_dma_exit (0): DMA=0x2d120000 cpu=0xed120000 size=65536
[ 11.418878] mantis_dma_exit (0): RISC=0x2fa86000 cpu=0xefa86000 size=1000
[ 11.418886] mantis_i2c_exit (0): Disabling I2C interrupt
[ 11.418897] mantis_i2c_exit (0): Removing I2C adapter
[ 11.418930] mantis_pci_exit (0): mem: 0xf3bcc000
[ 11.419015] Mantis: probe of 0000:03:00.0 failed with error -1