From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Sebastian Kemper <sebastian_ml@gmx.net>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: libata/PATA: GPCMD_SET_STREAMING via SG_IO does nothing
Date: Tue, 13 Nov 2007 21:22:30 +0000 [thread overview]
Message-ID: <20071113212230.77cadecd@the-village.bc.nu> (raw)
In-Reply-To: <20071113164323.GA5252@section-eight>
> while trying to limit the speed of DVD drives during DVD playback I've
> come under the impression that GPCMD_SET_STREAMING via SG_IO doesn't yet
> work with libata/PATA (AMD/NVIDIA PATA support). I tested on an NForce2
> board (all IDE, no SATA) and kernel 2.6.22.12. When I use the "old" ATA
> kernel driver my drive slows down, with libata it doesn't. Is this a
> known issue or has this slipped by unnoticed?
It isn't a known issue, and it suprises me as SG_IO basically passes
commands through to the drive. We don't support speed change via xfermode
setting but GPCMD_SET_STREAMING sohuld behave.
>
> I tried with mplayer dvd:// -dvd-device /dev/sr0 -dvd-speed BTW . I get
> no errors in syslog/dmesg. Also mplayer doesn't report a problem (so
> ioctl(fd, SG_IO, &sghdr) doesn't have a return < 0).
Do you have a simple code example that shows the problem ?
next prev parent reply other threads:[~2007-11-13 21:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-13 16:43 Sebastian Kemper
2007-11-13 21:22 ` Alan Cox [this message]
2007-11-13 23:28 ` Sebastian Kemper
2007-11-14 12:11 ` Sebastian Kemper
2007-11-14 15:09 ` Mark Lord
2007-11-14 15:38 ` Sebastian Kemper
2007-11-14 16:00 ` Mark Lord
2007-11-14 17:44 ` [PATCH] libata-scsi: be tolerant of 12-byte ATAPI commands in 16-byte CDBs Mark Lord
2007-11-14 17:50 ` Alan Cox
2007-11-15 2:26 ` Tejun Heo
2007-11-14 16:26 ` libata/PATA: GPCMD_SET_STREAMING via SG_IO does nothing Mark Lord
2007-11-14 16:41 ` Mark Lord
2007-11-14 17:11 ` Sebastian Kemper
2007-11-14 17:21 ` Mark Lord
2007-11-15 20:55 ` Bartlomiej Zolnierkiewicz
2007-11-15 20:59 ` Mark Lord
2007-11-14 17:16 ` Sebastian Kemper
2007-11-14 17:49 ` Mark Lord
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