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[Bug 1234818] Re: 17e9:0378 [Lenovo ThinkPad X1 Carbon] Regression: DisplayLink DL-195 fails with EAGAIN after upgrade from 3.11.0-031100 to 3.11.0-11


Nikolaus Rath, regarding your Bug Description, one thing that would need
to be clear is 3.11.0-031100-generic is a mainline kernel (seems
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-saucy/) and
3.11.0-11-generic is a Ubuntu kernel, not a mainline one, which maps to
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11.3-saucy/ .

Hence, the first thing that would need to be known, is this reproducible in both these mainline kernels:

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  17e9:0378 [Lenovo ThinkPad X1 Carbon] 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:
Status in “linux” source package in Saucy:
Status in “linux” source package in Trusty:

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.

  ApportVersion: 2.12.7-0ubuntu1
  Architecture: amd64
   /dev/snd/controlC0:  ubuntu     2883 F.... pulseaudio
  CasperVersion: 1.336ubuntu1
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131203)
  MachineType: LENOVO 3444F8U
  MarkForUpload: True
  Package: linux (not installed)
   0 inteldrmfb
   1 udldrmfb
  ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.12.0-5.13-generic 3.12.2
   linux-restricted-modules-3.12.0-5-generic N/A
   linux-backports-modules-3.12.0-5-generic  N/A
   linux-firmware                            1.117
  Tags:  trusty
  Uname: Linux 3.12.0-5-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

  dmi.bios.date: 02/04/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G6ET93WW (2.53 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 3444F8U
  dmi.board.vendor: LENOVO
  dmi.board.version: Win8 Pro DPK TPG
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG6ET93WW(2.53):bd02/04/2013:svnLENOVO:pn3444F8U:pvrThinkPadX1Carbon:rvnLENOVO:rn3444F8U:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3444F8U
  dmi.product.version: ThinkPad X1 Carbon
  dmi.sys.vendor: LENOVO

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