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[Nikolaus Rath <Nikolaus@xxxxxxxx>]

Bug is present in

Linux version 3.11.0-1-generic (buildd@roseapple) (gcc version 4.8.1
(Ubuntu/Linaro 4.8.1-8ubuntu1) ) #4-Ubuntu SMP Fri Aug 9 02:29:21 UTC
2013


Is it possible that this never worked with the Ubuntu kernels but only with the mainline kernel?

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https://bugs.launchpad.net/bugs/1234818

Title:
  Regression: DisplayLink DL-195 fails with EAGAIN after upgrade from
  3.11.0-031100  to 3.11.0-11

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  My Plugable UGA-2K-A USB 2.0 to DVI adapter (using chipset DisplayLink
  DL-195, USB ID 17e9:4302) works fine with 3.11.0-031100-generic.
  However, when upgrading to 3.11.0-11-generic, X11 fails to open the
  DRI device with

  [     8.868] (EE) open /dev/dri/card1: Resource temporarily
  unavailable

  Reverting to  3.11.0-031100-generic fixes the problem. Upgrading to
  current mainline (3.12.0-999.201310030405) also fixes the problem (but
  causes lots of kernel BUG messages).

  In both cases, the kernel correctly creates the /dev/fb1 and
  /dev/dri/card1 devices. There are no error messages in the kernel log.

  I can bisect this if someone tells me where to find the intermediate
  versions.

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