hid_write with hidraw back-end fails with EIO on EL7

[opoplawski]

I've been using some TEMPer1V1.1 usb probes for a while now with RHEL6 with no (or at least very few) problems. Just upgraded to RHEL7 and now hid_write() is failing with EIO. Kernel is 3.10.0-514.16.1.el7.x86_64.

open("/dev/hidraw1", O_RDWR)            = 3
ioctl(3, HIDIOCGRDESCSIZE or HIDIOCGVERSION or SNDRV_HWDEP_IOCTL_INFO, 0x7ffc0d8fa6ec) = 0
ioctl(3, HIDIOCAPPLICATION or HIDIOCGRDESC or SNDRV_HWDEP_IOCTL_DSP_STATUS, 0x7ffc0d8fa6f0) = 0
write(3, "\0\1\2003\1\0\0\0\0", 9)      = -1 EIO (Input/output error)
write(2, "/dev/hidraw1: Failed to read the"..., 67/dev/hidraw1: Failed to read the sensors: HID write failed: (null)
) = 67
close(3)                                = 0

The dev handle contains:

$6 = {device_handle = 7, blocking = 1, uses_numbered_reports = 0}

I switched to the libusb backend and that works, so perhaps it would be better to prefer that one over hidapi-hidraw?

[elkur]

I have similar issue with Centos7. Everything worked until kernel was upgraded to 3.10.0-514 or newer. Error message: "/dev/hidraw1: Could not open device: HID write failed: (null)"

uname -r
3.10.0-514.10.2.el7.x86_64

./hid-query --enum
/dev/hidraw0 : 0c45:7402 interface 0 : RDing TEMPERHUM1V1.2
/dev/hidraw1 : 0c45:7402 interface 1 : RDing TEMPERHUM1V1.2

./tempered -e
/dev/hidraw1 : TEMPer2HumiV1.x (USB IDs 0C45:7402)

./tempered
/dev/hidraw1: Could not open device: HID write failed: (null)

Booting into older 3.10.0-327 kernel and no problems:
uname -r
3.10.0-327.28.3.el7.x86_64

./tempered
/dev/hidraw1 0: temperature 23.18 °C, relative humidity 26.3%, dew point 2.8 °C