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[Bug 1689517] Re: Displayport daisy chained displays get recognized as the same

 

Would it be possible for you to test the latest upstream stable kernel?
Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the
latest v4.4 stable kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.68

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Xenial)
       Status: New => Incomplete

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

** Tags added: kernel-da-key

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1689517

Title:
  Displayport daisy chained displays get recognized as the same

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  Incomplete

Bug description:
  Hi,

  I'm using Ubuntu 16.04.2 LTS.

  Since I upgraded to 4.4.0-77, my daisy chained displays seem to get
  recognized as the same. Before, I've been using 4.4.0-72. Booting the
  older Kernel using grub also still works.

  I'm using two Dell U2715H Displays daisy chained. (DP1-1 and DP1-8)
  Both with 2560x1440px. Simultaneously, I use my Notebook Display with
  1920x1080px. (eDP1) I have a script, which I run manually after
  startx, which sets up my environment. It does:

  xrandr --output DP1-1 --mode 2560x1440
  xrandr --output DP1-8 --mode 2560x1440
  xrandr --output DP1-8 --left-of eDP1
  xrandr --output DP1-1 --left-of DP1-8

  On 4.4.0-77 both, DP1-1 and DP1-8 show the same picture (left-of eDP1);
  whereas on 4.4.0-72,
  DP1-1 shows the picture left of DP1-8,
  and DP1-8 shows the picture left of eDP1
  as expected.

  If I take a screenshot using xfce4-screenshooter, everything seems
  fine.

  I attached the output from xrandr on both kernels, screenshots from
  both pictures and reference pictures taken with my camera for you to
  see what actually happens.

  Thanks.

  Screen 0: minimum 8 x 8, current 7040 x 1440, maximum 32767 x 32767
  eDP1 connected 1920x1080+5120+0 (normal left inverted right x axis y axis) 309mm x 173mm
     1920x1080     60.05*+  59.93  
     1680x1050     59.95    59.88  
     1600x1024     60.17  
     1400x1050     59.98  
     1600x900      60.00  
     1280x1024     60.02  
     1440x900      59.89  
     1280x960      60.00  
     1368x768      60.00  
     1360x768      59.80    59.96  
     1152x864      60.00  
     1280x720      60.00  
     1024x768      60.00  
     1024x576      60.00  
     960x540       60.00  
     800x600       60.32    56.25  
     864x486       60.00  
     640x480       59.94  
     720x405       60.00  
     640x360       60.00  
  DP1 disconnected (normal left inverted right x axis y axis)
  DP1-1 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
     2560x1440     59.95*+
     2048x1152     60.00  
     1920x1200     59.88  
     1920x1080     60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98  
     1600x1200     60.00  
     1680x1050     59.95  
     1280x1024     75.02    60.02  
     1200x960      59.99  
     1152x864      75.00  
     1280x720      60.00    50.00    59.94  
     1024x768      75.08    60.00  
     800x600       75.00    60.32  
     720x576       50.00  
     720x480       60.00    59.94  
     640x480       75.00    60.00    59.94  
     720x400       70.08  
  DP1-8 connected 2560x1440+2560+0 (normal left inverted right x axis y axis) 597mm x 336mm
     2560x1440     59.95*+
     2048x1152     60.00  
     1920x1200     59.88  
     1920x1080     60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98  
     1600x1200     60.00  
     1680x1050     59.95  
     1280x1024     75.02    60.02  
     1200x960      59.99  
     1152x864      75.00  
     1280x720      60.00    50.00    59.94  
     1024x768      75.08    60.00  
     800x600       75.00    60.32  
     720x576       50.00  
     720x480       60.00    59.94  
     640x480       75.00    60.00    59.94  
     720x400       70.08  
  HDMI1 disconnected (normal left inverted right x axis y axis)
  HDMI2 disconnected (normal left inverted right x axis y axis)
  VGA1 disconnected (normal left inverted right x axis y axis)
  VIRTUAL1 disconnected (normal left inverted right x axis y axis)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-77-generic 4.4.0-77.98
  ProcVersionSignature: Ubuntu 4.4.0-77.98-generic 4.4.59
  Uname: Linux 4.4.0-77-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  florian    2980 F.... pulseaudio
   /dev/snd/pcmC1D0c:   florian    2980 F...m pulseaudio
   /dev/snd/pcmC1D0p:   florian    2980 F...m pulseaudio
   /dev/snd/controlC1:  florian    2980 F.... pulseaudio
  Date: Tue May  9 11:27:40 2017
  HibernationDevice: RESUME=/dev/mapper/data-swap
  InstallationDate: Installed on 2015-08-01 (646 days ago)
  InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Notebook W740SU
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-77-generic.efi.signed root=/dev/mapper/system-system ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-77-generic N/A
   linux-backports-modules-4.4.0-77-generic  N/A
   linux-firmware                            1.157.8
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-06-12 (330 days ago)
  dmi.bios.date: 08/13/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W740SU
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd08/13/2013:svnNotebook:pnW740SU:pvrNotApplicable:rvnNotebook:rnW740SU:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: W740SU
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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