ubuntu server： Asking for cache data failed

Ubuntu 12.04 LTS 错误解决

最新推荐文章于 2022-12-24 01:14:11 发布

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本文解决了一个出现在 Ubuntu 12.04 LTS 中的错误：“Asking for cache data failed”，该错误与 Realtek 多卡读卡器有关，并提供了卸载 ums_realtek 模块来解决此问题的方法。

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 hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 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 realtek
ums_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.

7 down vote accepted

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)