Age | Commit message (Collapse) | Author |
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Many servers will be connected to KVMs or include iLO support, and this
is often presented as a set of USB input devices. Enabling autosuspend on
these allows the USB hardware to be powered down, avoiding unnecessary
wakeups and power consumption. The input devices will be self powered, so
there's no risk of losing input events as there would be for real input
devices. The same is true of USB input devices that are built into the
system.
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On Sun, Nov 6, 2011 at 21:45, William Hubbs <w.d.hubbs@gmail.com> wrote:
> someone on gentoo just reported to me that the following rule has been
> deleted from udev-174, which is leaving his optical devices in the
> standard "disk" group. He does not want to add his users to this group.
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All mounting is done by systemd now. Non-systemd systems
need to ship their own rules if they want fusefs be auto-mounted.
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On Tue, Aug 2, 2011 at 10:56, Thomas Bächler <thomas@archlinux.org> wrote:
> Commit c49df20758e0f22778cfc93b598f2929f4c86272 prevented udev from
> creating broken symlinks for bluetooth hid devices. Unfortunately,
> it also removed the ID_INPUT=1 and ID_INPUT_{KEY,MOUSE}=1 properties
> from those devices. Xorg relies on these properties for cold- and
> hotplugging of input devices.
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When the CD tray door is locked and the hardware eject button is pressed, newer
kernels (2.6.38+) will send out a change event with a DISK_EJECT_REQUEST==1
property. Do not run cdrom_id and blkid in this case, as the media state and
contents does not change, and this only needlessly spins up the drive again
right before ejection.
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If a USB device is marked as removable, it is often a SATA/PATA disk
in an enclosure (note that flash card readers and usb storage sticks
are always marked as removable). In this case, try running ata_id
(which sends ATA commands wrapped in SCSI ATA PASS THROUGH commands)
to get information about the disk. If this fails, just fall back to
running usb_id since it could be the device isn't an ATA device at
all or the device doesn't have a SAT layer.
This extra information is nice to have as it indicates if it is
suitable to send e.g. SMART commands to the disk, whether the disk
supports power management and so on. Additionally, the VPD and serial
number returned by ata_id is usually more accurate as it stems from
the disk itself instead of the enclosure.
Note that udisks has been doing this for a while
KERNEL=="sd*[!0-9]", ATTR{removable}=="0", ENV{ID_BUS}=="usb", ENV{DEVTYPE}=="disk", IMPORT{program}="udisks-probe-ata-smart $tempnode"
so this change shouldn't be too disruptive (udisks-probe-ata-smart
also sends ATA commands via the ATA PASS THROUGH command).
Signed-off-by: David Zeuthen <davidz@redhat.com>
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Commit 5e9eb156c added new symlinks for multi-interface USB input devices.
However, we do not actually need the one for interface number "00", as we
already have the symlink without the interface number.
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Create /dev/input/by-id symlinks containing the USB interface number so that
each interface in a multi-interface USB input device gets its own symlink.
Thanks to a7x <ubuntu-a7x@scientician.org>!
https://launchpad.net/bugs/626449
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These patches enable usb autosuspend for the qemu emulated HID devices.
This reduces the cpu load for idle guests with a hid device attached
because the linux kernel will suspend the usb bus then and qemu can stop
running a 1000 Hz to emulate the (active) UHCI controller.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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The bsg devices node are created after the LUN, so we fail in the
hotplug case, but succeed at coldplug, and create inconsistent data
that way.
The bsg device event order will need to be sorted out, by changing the
kernel.
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