** Attachment added: "Xorg log when booting with 18.04 kernel"

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Touch seeded packages, which is subscribed to xorg in Ubuntu.

  Regression: Upgrading from 17.10 to 18.04 reduces resolution available
  on monitor

Status in xorg package in Ubuntu:

Bug description:
  Symptom: booting 18.04 kernel reduces resolution available while 17.10
  kernel (on 18.04) does not

  I have a 3 identical monitor setup - all at 2560x1600 native
  resolution.  If I boot the current 18.04 kernel 4.15.0-13-generic then
  the third monitor does not have the native resolution available.  If I
  reboot with the last 17.10 kernel 4.13.0-37-generic then all monitors
  have the native resolution available.

  On the video card the monitors are connected to HDMI, DisplayPort and
  DVI.  On the monitors themselves the connectors are HDMI, DisplayPort
  and HDMI.  (3rd monitor is using DVI to HDMI cable.)

  Xorg logs show identical EDID information between the kernels.
  18.04's just decides to not make 2560x1600 available, having 2048x1080
  or 1920x1200 as the highest.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu6
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  CompizPlugins: No value set for 
  CompositorRunning: None
  CurrentDesktop: XFCE
  Date: Tue Apr 10 12:17:31 2018
  DistUpgraded: 2018-03-31 12:24:30,098 DEBUG Running PostInstallScript: 
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
   Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 460] [1002:67ef] 
(rev e5) (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Baffin [Radeon RX 460/560D / Pro 
450/455/460/560] [1458:230a]
   ** Message: Starting lightdm-gtk-greeter 2.0.1 (Aug  7 2015, 01:24:18)
   ** Message: [Configuration] Reading file: 
   ** Message: [Configuration] Reading file: 
   ** Message: [Configuration] Reading file: 
   upstart: indicator-application main process (1456) killed by TERM signal
  MachineType: Supermicro C7Z170-SQ
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-13-generic 
root=UUID=725712a6-f0e0-4da1-b3d1-746a233eb459 ro rootflags=subvol=@
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to bionic on 2018-03-31 (9 days ago)
  dmi.bios.date: 12/19/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.0
  dmi.board.asset.tag: Default string
  dmi.board.name: C7Z170-SQ
  dmi.board.vendor: Supermicro
  dmi.board.version: 1.01A
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 0123456789
  dmi.product.family: Default string
  dmi.product.name: C7Z170-SQ
  dmi.product.version: 0123456789
  dmi.sys.vendor: Supermicro
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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