Hello, here is the result of the command : $ for i in /sys/class/scsi_host/*; do cat $i/can_queue; done 1 1 1 1 1 1 31 31 but the sata DVD burner is now connected on a Jmicron sata PCIe card ( with this configuration the bug doesn't occur ), I don't know if this change can modify the result of your command, here is the result of another command : $ for i in /sys/class/scsi_host/*; do cat $i/proc_name; done pata_jmicron pata_jmicron ata_piix ata_piix ata_piix ata_piix ahci ahci $ dmesg | grep ahci [ 0.883351] ahci 0000:03:00.0: version 3.0 [ 0.883505] ahci 0000:03:00.0: AHCI 0001.0100 32 slots 2 ports 3 Gbps 0x3 impl SATA mode [ 0.883508] ahci 0000:03:00.0: flags: 64bit ncq pm led clo pmp pio slum part [ 0.884329] scsi host6: ahci [ 0.884502] scsi host7: ahci Le 20/11/2014 18:53, Christoph Hellwig a écrit : > On Thu, Nov 20, 2014 at 06:44:32PM +0100, Barto wrote: >> I notice that my motherboard doesn't support "AHCI" mode, my motherboard >> uses an ICH7 sata controler, ICH7 doesn't support AHCI if I check the >> technical specifications of this controler, >> >> it seems that my bios treats SATA devices like IDE devices ( IDE >> emulation mode ), for example I can read in the bios these lines "IDE 0 >> channel master : "the name of Sata harddisk 1", "IDE 3 channel master : >> "the name of Sata harddisk 2", >> >> perhaps the bug only occurs when the AHCI mode is not used ? > > Looks like it. I suspect you device only supports a single outstanding > command without AHCI, can you confirm this by doing: > > for i in /sys/class/scsi_host/*; do cat $i/can_queue; done > > -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
