Re: broken access to a USB HID device after suspend

On Wed, Mar 12, 2008 at 22:23:46 +0100, Jiri Kosina wrote:
On Wed, 12 Mar 2008, Tino Keitel wrote:

I use a tool called hidmon to control the parameters of my LCD in shell
scripts. I just had the case where this tool didn't work after suspend
to RAM. I just got this error message:

hid_force_open failed with return code 13

The kernel log contains lines like this:

usb 1-1.3: usbfs: USBDEVFS_CONTROL failed cmd hidmon rqt 129 rq 6 len 9 ret -110

Unplugging and replugging the USB cable of the LCD didn't work.
However, after a further suspend/resume cycle it works.

This is Linux 2.6.25-rc5. The behaviour is not repoducible, though.
However, I just mention it for the case that this might ring a bell
somewhere.

This in fact looks like a problem with usbdevfs and/or libusb library, not
the in-kernel HID drvier.

Did this work before? In 2.6.24? 2.6.23? Alan (added to CC, as well as USB

It worked in 2.6.24 and several 2.6.25-rc kernels, including the
currently running 2.6.25-rc5.

Regards,
Tino
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