** Description changed:
Filing here per request at:
http://irclogs.ubuntu.com/2015/11/24/%23ubuntu-devel.html#t14:35
- I have approximately fifty USB touch panels. These are from two
- different batches, but all report the same USB ID 0c45:8419. The
- manufacturer told me they had changed the firmware without changing the
- USB ID/version because they did not consider the change important. Both
- batches work correctly on Ubuntu 10.04, but only one batch works on
- 14.04. As such, this is a regression.
+ I have approximately 300 USB touch panels. These are from two different
+ batches, but all report the same USB ID 0c45:8419. The manufacturer
+ told me they had changed the firmware without changing the USB
+ ID/version because they did not consider the change important. Both
+ batches work correctly on Ubuntu 10.04, but only the first batch works
+ on 14.04. The remaining batch does not so this is a regression.
- After plugging in, both batches appear equivalently as:
+ After plugging in, both batches appear equivalently under:
/dev/input/eventNN
and for both 'evtest' reports:
Input device ID: bus 0x3 vendor 0xc45 product 0x8419 version 0x100
Input device name: "SONiX USB Device"
…
Presumably something is occuring that causes a version version of
'libev' to handle one batch differently. Attached is the output of
running:
$ sudo lsusb -vvvv -c -d 0c45:8419 > ….txt
for one device from each of the two batches, which confirms that they
- appear identically.
+ appear identically. I have tested 250/250 (working) from the first
+ batch, and 10/50 (not-working) from the second batch.
+
+ The only way to tell the batches apart is by the length of the USB
+ cable, which is NNN centimetres LONGER/SHORTER on the working batch.
** Changed in: evtest (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1519393
Title:
New revision of 0c45:8419 Microdia USB Touchscreen not working under
14.04
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