ubuntu server: Asking for cache data failed
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在安装的ubuntu12.10 64bit server时,出现下面的错误:
[11690.011238] [sdb] Asking for cache data failed
[11690.011248] [sdb] Assuming drive cache: write through
googel了下找到下面的解决方案,是ubuntu的一个bug:在我机器上卸载后就没有问题了,但是重装就会有问题,临时的解决办法时,写一个脚本开机运行
sudo rmmod ums_realtek
http://askubuntu.com/questions/132100/errors-in-dmesg-test-wp-failed-assume-write-enabled
I'm having the same issue on the official 12.04 LTS relase i also believe it is causing the system to be
less responsive. According to some sources it's harmless. (i can apparently only post 2 links)
The following thinks this is error output from an onboard card reader:
https://bbs.archlinux.org/viewtopic.php?pid=1059099
It's confirmed to be an upstream issue in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/987993
Run lsusb and find the offending device
nathan@Ham-Bone:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 001 Device 002: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader
In my case it's the Realtek multicard reader which a quick check of
$ dmesg | grep realtek[ 4.716068] usbcore: registered new interface driver ums-realtek$ lsmod | grep realtekums_realtek 17920 0
reveals a module ums-realtek
$sudo rmmod ums_realtek
Fixes the problem in a reversible way for me. That is
$sudo modprobe ums_realtek
enables the card reader again. I haven't tested if it works since I never use it.
If this doesn't work there are some other ways to disable usb devices by unbinding them in the /sys/ directory.
I'm having the same issue on the official 12.04 LTS relase i also believe it is causing the system to be less responsive. According to some sources it's harmless. (i can apparently only post 2 links)
The following thinks this is error output from an onboard card reader:
https://bbs.archlinux.org/viewtopic.php?pid=1059099
It's confirmed to be an upstream issue in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/987993
Run lsusb and find the offending device
nathan@Ham-Bone:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 001 Device 002: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader
In my case it's the Realtek multicard reader which a quick check of
$ dmesg | grep realtek[ 4.716068] usbcore: registered new interface driver ums-realtek$ lsmod | grep realtekums_realtek 17920 0
reveals a module ums-realtek
$sudo rmmod ums_realtek
Fixes the problem in a reversible way for me. That is
$sudo modprobe ums_realtek
enables the card reader again. I haven't tested if it works since I never use it.
If this doesn't work there are some other ways to disable usb devices by unbinding them in the /sys/ directory.
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