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[Jean-Louis Dupond <jean-louis@xxxxxxxxx>]

Seems like Ben fixed this issue:
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?h=linux-3.17&id=6fbb702e27d78ad2458df048b58cca3454bc0965

Used that commit on my kernel, and it fixes the issue!
Great! Thx!

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https://bugs.launchpad.net/bugs/1374607

Title:
  nouveau - HDMI gives no more signal since 3.15 (optimus)

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Committed
Status in “linux” source package in Utopic:
  Fix Committed

Bug description:
  This week I tried HDMI again on my system, and noticed it was completely broken.
  Got just no signal on my screen.

  I knew it was working some months (and upgrades) ago.
  After testing I found out the issue was introduced between kernel v3.14 and v3.15.

  Situation:
  Insert HDMI cable into my laptop, and no signal on the external display.

  The dmesg fills with errors also:
  [  186.210622] nouveau E[   PDISP][0000:01:00.0] INVALID_STATE [UNK08] chid 0 mthd 0x0080 data 0x00000000
  [  186.210627] nouveau E[   PDISP][0000:01:00.0] Core:
  [  186.210634] nouveau E[   PDISP][0000:01:00.0] 	0x0084: 0x5dc34da1 -> 0x80000000
  [  186.210640] nouveau E[   PDISP][0000:01:00.0] 	0x0088: 0x00000000              

  etc.

  After some git bisect playtime, I found out the following commit caused the issue:
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/nouveau?id=05c63c2ff23a80b654d6c088ac3ba21628db0173

  So I went back to stable 3.16 (Ubuntu Utopic version), and did a git revert for that commit.
  And yep, HDMI output was working again, and no more nouveau errors in dmesg.

  
  My device:
  [   30.823267] nouveau  [  DEVICE][0000:01:00.0] BOOT0  : 0x0c1a00a1
  [   30.823269] nouveau  [  DEVICE][0000:01:00.0] Chipset: GF108 (NVC1)
  [   30.823270] nouveau  [  DEVICE][0000:01:00.0] Family : NVC0

  Laptop dell xps 15 l502x

  So this can be fixed with just reverting this commit. Else this is an annoying regression in Utopic.
  --- 
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jean-louis   3531 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 14.10
  HibernationDevice: RESUME=UUID=633b79c4-1f68-4dd5-be23-b297eed028cd
  InstallationDate: Installed on 2011-07-14 (1177 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110705.1)
  MachineType: Dell Inc. Dell System XPS L502X
  Package: linux (not installed)
  ProcFB:
   0 inteldrmfb
   1 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-20-generic root=/dev/mapper/ubuntu-root_crypt ro quiet splash modeset=1 pcie_aspm=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-20.27-generic 3.16.3
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-20-generic N/A
   linux-backports-modules-3.16.0-20-generic  N/A
   linux-firmware                             1.134
  Tags:  utopic
  Uname: Linux 3.16.0-20-generic x86_64
  UpgradeStatus: Upgraded to utopic on 2014-09-15 (18 days ago)
  UserGroups: adm admin bacula cdrom dialout libvirtd lpadmin plugdev sambashare wireshark
  _MarkForUpload: True
  dmi.bios.date: 09/07/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 0NJT03
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd09/07/2012:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0NJT03:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L502X
  dmi.sys.vendor: Dell Inc.

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