> Has there been a change in the VESA/AST mechanism from 16.04 to 18.04
?

I think the answer is "yes" there must have been a kernel change that
caused the regression. It's not yet clear where the regression occurred
between 16.04 and 18.04 (there's at least two years work between them)
but at least we seem to have a fix for it.

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

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

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https://bugs.launchpad.net/bugs/1808183

Title:
  ASPEED server console output extremely slow after upgrade to 18.04

Status in linux package in Ubuntu:
  Triaged

Bug description:
  After the upgrade from 16.04 to 18.04 my server console is extremely slow.
  It looks similar to the youtube clips mentioned in the problem described 
here: https://ubuntuforums.org/showthread.php?t=2399941
  My server is attached to a KVM switch with VGA cable to a 1920x1080 LCD.
  It runs on an ASUS P9D-X board.
  Before the upgrade everything was fine.
  Now it is so slow that it sometimes even hangs during boot and goes into an 
emergency console where I just can do a ctrl-alt-delete as described in bug 
1802469

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg (not installed)
  ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
  Uname: Linux 4.15.0-42-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  Date: Wed Dec 12 17:07:48 2018
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to bionic on 2018-10-11 (62 days ago)
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Dec 15 07:22 seq
   crw-rw---- 1 root audio 116, 33 Dec 15 07:22 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=99dd75dc-dc37-4970-be5a-79d9244a3bcc
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: ASUSTeK COMPUTER INC. P9D-X Series
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 astdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-42-generic 
root=UUID=0fa1f208-3a7b-44ca-9f85-e7349a3b1844 ro nosplash
  ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-42-generic N/A
   linux-backports-modules-4.15.0-42-generic  N/A
   linux-firmware                             1.173.2
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  Tags:  bionic
  Uname: Linux 4.15.0-42-generic x86_64
  UnreportableReason: This report is about a package that is not installed.
  UpgradeStatus: Upgraded to bionic on 2018-10-11 (64 days ago)
  UserGroups:
   
  _MarkForUpload: False
  dmi.bios.date: 10/13/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0901
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P9D-X Series
  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: 17
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0901:bd10/13/2014:svnASUSTeKCOMPUTERINC.:pnP9D-XSeries:pvrRev1.xx:rvnASUSTeKCOMPUTERINC.:rnP9D-XSeries:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct17:cvrToBeFilledByO.E.M.:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: P9D-X Series
  dmi.product.version: Rev 1.xx
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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