Re: Bug#522091: udev: unable to make hdd go standby

[Kay Sievers <kay.sievers@xxxxxxxx>]

> From: John van der Kamp <john@xxxxxxxxxxxxxxx>
>
> Normally, I set a harddisk to standby using hdparm (hdparm -y /dev/sda)
> on startup (rc.local), but udev immediately spins the harddisk backup.
> Only after stopping udev would the harddisk stay in standby mode. I had
> no problems with udev 0.125 with this sofar. Since I have 0.140 this
> problem arose.

On Tue, Mar 31, 2009 at 20:25, Marco d'Itri <md@xxxxxxxx> wrote:
> Indeed a change event is generated when I run hdparm -y /dev/sda.
> Does anybody know why, and a workaround?

Because hdparm opens the device writable, while it should probably
only do it with O_RDONLY. Recent udev versions check the device again,
when it was opened for writing.

Kay
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