Hi, Hannes I applied your patch for AHCI suspend/resume to 2.6.16 and had a test on our Napa SDV. The test result is that this patch can't work on Napa SDV. In particular, when the system tried to resume from S3 state, the error message in dmesg is: ata1: qc timeout (cmd 0xef) ata1: failed to set xfermode, disabled ata1: dev 0 configured for UDMA/100 Could you give me some hint why the timeout happened? How to resolve this? I tried "restart port" and "hardreset" in resume function, but dev 0 still can't be waken up to life. Thanks, Forrest - : send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html