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Date: Sat, 11 Dec 2010 14:38:16 -0500 (EST) From: Alan Stern <stern@...land.harvard.edu> To: Stefan Richter <stefanr@...6.in-berlin.de> cc: linux-pm@...ts.linux-foundation.org, <linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: Re: [linux-pm] 2.6.37-rc5, pata_atiixp, DVD-ROM: kernel log flooded with "rpm_resume flags 0x4", "rpm_resume returns 1" On Sat, 11 Dec 2010, Stefan Richter wrote: > Hi, > > I just booted from 2.6.36 (without PM debugging configured) into > 2.6.37-rc5 (with PM debugging enabled). There is endless log spam like > this: > > Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume flags 0x4 > Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume returns 1 > Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume flags 0x4 > Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume returns 1 ... > Why is rpm_resume performed 6 times every two seconds? This is probably because hal probes the DVD drive every two seconds looking for media changes. However that's not supposed to cause rpm_resume to be called for the host unless runtime PM is allowed for the DVD drive, which it isn't according to your listings below. So there's a bug somewhere. > host6 is pata_atiixp with an: > > 00:14.1 IDE interface: ATI Technologies Inc SB700/SB800 IDE Controller > (prog-if 8a [Master SecP PriP]) > > # grep . /sys/class/scsi_host/host6/power/* > /sys/class/scsi_host/host6/power/async:enabled > grep: /sys/class/scsi_host/host6/power/autosuspend_delay_ms: Input/output error > /sys/class/scsi_host/host6/power/control:auto > /sys/class/scsi_host/host6/power/runtime_active_kids:0 > /sys/class/scsi_host/host6/power/runtime_active_time:0 > /sys/class/scsi_host/host6/power/runtime_enabled:disabled > /sys/class/scsi_host/host6/power/runtime_status:unsupported > /sys/class/scsi_host/host6/power/runtime_suspended_time:0 > /sys/class/scsi_host/host6/power/runtime_usage:0 This is the wrong directory (the class device, not the device itself). You should look at /sys/class/scsi_host/host6/device/power instead. And also /sys/class/scsi_host/host6/device/target6:0:0/power. > Attached to it is one device: > > Host: scsi6 Channel: 00 Id: 00 Lun: 00 > Vendor: PLEXTOR Model: DVD-ROM PX-130A Rev: 1.01 > Type: CD-ROM ANSI SCSI revision: 05 > > # grep . /sys/class/scsi_host/host6/device/target6\:0\:0/6\:0\:0\:0/power/* > /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/async:enabled > grep: /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/autosuspend_delay_ms: Input/output error > /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/control:on > /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_active_kids:0 > /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_active_time:2689146 > /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_enabled:forbidden > /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_status:active > /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_suspended_time:0 > /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_usage:2 These values are correct; they show that the DVD drive is forbidden from doing a runtime suspend. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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