Looks like maybe I was a little bit too hasty and there is a better explanation and fix. Please see: https://bugs.kde.org/show_bug.cgi?id=139985
on 12/01/2007 20:00 Andriy Gapon said the following: > Guys, > > FYI. > > -------- Original Message -------- > Subject: Re: kern/106432: Record of disks (DVD-R) through the k3b > program leads to lag of system > Date: Fri, 12 Jan 2007 19:57:06 +0200 > From: Andriy Gapon <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] > > > I would like to followup on the portion of this PR that says that k3b > shows incorrect speed list in its "Speed" drop-down for DVD media. > > I have this problem as well and I think that I found a reason. The > following lines from k3b debug output raised my suspicion: > > k3b: (K3bDevice::openDevice) open device /dev/pass0 succeeded. > k3b: (K3bDevice::ScsiCommand) transport command ac, length: 12 > k3b: (K3bDevice::openDevice) open device /dev/pass0 succeeded. > k3b: (K3bDevice::ScsiCommand) transport command ac, length: 10 > k3b: (K3bDevice::Device) /dev/cd0: Number of supported write speeds via > GET PERFORMANCE: 7 > k3b: (K3bDevice::Device) /dev/cd0 : 13854 KB/s > k3b: (K3bDevice::Device) /dev/cd0 Invalid DVD speed: 0 KB/s > k3b: (K3bDevice::Device) /dev/cd0 Invalid DVD speed: 0 KB/s > k3b: (K3bDevice::Device) /dev/cd0 Invalid DVD speed: 0 KB/s > k3b: (K3bDevice::Device) /dev/cd0 Invalid DVD speed: 0 KB/s > k3b: (K3bDevice::Device) /dev/cd0 Invalid DVD speed: 0 KB/s > k3b: (K3bDevice::Device) /dev/cd0 Invalid DVD speed: 0 KB/s > > It seems that the second 0xAC (GET PERFORMANCE) command was sent as > 10-byte command instead of correct 12-byte command. I've checked the > sources of k3b and dvd+rw-mediainfo and they both send two 0xAC commands > , first one is to query number of writing profiles and the second one is > to actually get them. Only dvd+rw-mediainfo does it correctly and k3b > does it incorrectly. > > The problem is in libk3bdevice/k3bdevice_mmc.cpp file, method > K3bDevice::Device::getPerformance(): the code assumes that some bytes in > cmd[] will survive the first execution and so they do not need to be set > again. This might be an incorrect assumption. So I changed the > corresponding lines so that they look like follows: > [[[[]]]] > int numDesc = (dataLen-8)/16; > > cmd[0] = MMC_GET_PERFORMANCE; > cmd[1] = dataType; > cmd[2] = lba >> 24; > cmd[3] = lba >> 16; > cmd[4] = lba >> 8; > cmd[5] = lba; > cmd[8] = numDesc>>8; > cmd[9] = numDesc; > cmd[10] = type; > cmd[11] = 0; // Necessary to set the proper command length > [[[[]]]] > > Now everything is correct: > k3b: (K3bDevice::openDevice) open device /dev/pass0 succeeded. > k3b: (K3bDevice::ScsiCommand) transport command ac, length: 12 > k3b: (K3bDevice::openDevice) open device /dev/pass0 succeeded. > k3b: (K3bDevice::ScsiCommand) transport command ac, length: 12 > k3b: (K3bDevice::Device) /dev/cd0: Number of supported write speeds via > GET PERFORMANCE: 7 > k3b: (K3bDevice::Device) /dev/cd0 : 22161 KB/s > k3b: (K3bDevice::Device) /dev/cd0 : 22160 KB/s > k3b: (K3bDevice::Device) /dev/cd0 : 16621 KB/s > k3b: (K3bDevice::Device) /dev/cd0 : 16620 KB/s > k3b: (K3bDevice::Device) /dev/cd0 : 11081 KB/s > k3b: (K3bDevice::Device) /dev/cd0 : 11080 KB/s > k3b: (K3bDevice::Device) /dev/cd0 : 5540 KB/s > > And I see the correct list in GUI drop-down too. > Before that I had to always set DVD writing speed to "Ignore", so that > k3b wouldn't try to force some unnatural speed on my DVD drive. > > -- Andriy Gapon _______________________________________________ freebsd-ports@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-ports To unsubscribe, send any mail to "[EMAIL PROTECTED]"
