apport information

** Attachment added: "ProcInterrupts.txt"
   
https://bugs.launchpad.net/bugs/1785481/+attachment/5172022/+files/ProcInterrupts.txt

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https://bugs.launchpad.net/bugs/1785481

Title:
  amdgpu WQHD resolution(2560 × 1440) not available

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello,

  I use ubuntu 16.04 with hwe stack and an Radeon R9 285.
  With kernel 4.13 and older, I can use a resolution of 2560x1440.
  But, since the upgrade to kernel 4.15, I'm limited to the 1920x1200.

  I have attached the output of xrandr on both kernel.
  My screen (Dell U2713HM) is plugged to the output DVI-1.

  With a kernel 4.13, the output is detected as a DVI-I.
  But with a kernel 4.15, the output is detected as a DVI-D.

  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.15.0-29-generic 4.15.0-29.31~16.04.1
  ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Aug  5 16:46:32 2018
  SourcePackage: linux-signed-hwe
  UpgradeStatus: Upgraded to xenial on 2016-12-17 (595 days ago)
  --- 
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  frederic   2366 F.... pulseaudio
   /dev/snd/controlC1:  frederic   2366 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=/dev/mapper/Fred_SSD-Fred_Swap
  IwConfig:
   lo        no wireless extensions.
   
   em1       no wireless extensions.
  MachineType: ASUS All Series
  Package: linux (not installed)
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-29-generic 
root=/dev/mapper/Fred_SSD-Fred_Root ro quiet
  ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-generic 4.15.18
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-29-generic N/A
   linux-backports-modules-4.15.0-29-generic  N/A
   linux-firmware                             1.157.20
  RfKill:
   
  Tags:  xenial
  Uname: Linux 4.15.0-29-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-12-17 (596 days ago)
  UserGroups: adm cdrom dip lp lpadmin plugdev sambashare scanner sudo video
  _MarkForUpload: True
  dmi.bios.date: 10/28/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3003
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: MAXIMUS VII RANGER
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3003:bd10/28/2015:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnMAXIMUSVIIRANGER:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: ASUS MB
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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