Okay as a temporary solution lower the speed to hs200. Boot up the
machine while hitting the F8 button, press cancel when the boot options
box pops up. Then proceed to advanced mode(f7), here go to Chipset/South
Cluster Configuration/SCC Configuration. Here select eMMC max speed and
select hs200. Then click on Save & Exit in the middle, there click Save
and reset. Do not touch anything else in there because it can brick the
device and the only way to reset the BIOS is to blow it apart...

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https://bugs.launchpad.net/bugs/1818407

Title:
  Cant access emmc, error -84

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Greetings!

  I just got my new convertible(Asus TP202NAS, brand new) and wanted to install 
kubuntu 18.10 onto the internal storage, only to find that it cant see it. In 
dmesg i only got these two error:
  mc0: mmc_select_hs400 failed, error -84
  mc0: error -84 whilst initializing mmc card

  Tried to google around for a solution but i didnt found any solution
  to this, also tried the kubuntu IRC channel but didnt got any luck
  there too....

  
  /EDIT
  Submitted from a live session.

  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: ubuntu-release-upgrader-core 1:18.10.11
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
  CasperVersion: 1.399
  CrashDB: ubuntu
  Date: Sun Mar  3 13:59:13 2019
  LiveMediaBuild: Kubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.2)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  kubuntu    3661 F.... pulseaudio
  CasperVersion: 1.394
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 18.04
  LiveMediaBuild: Kubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  Lsusb:
   Bus 002 Device 003: ID 0781:5581 SanDisk Corp. Ultra
   Bus 002 Device 002: ID 05e3:0747 Genesys Logic, Inc. 
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 13d3:3501 IMC Networks 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. TP202NAS
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz 
file=/cdrom/preseed/username.seed boot=casper maybe-ubiquity quiet splash ---
  ProcVersionSignature: Ubuntu 4.18.0-15.16~18.04.1-generic 4.18.20
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-15-generic N/A
   linux-backports-modules-4.18.0-15-generic  N/A
   linux-firmware                             1.173.3
  Tags:  bionic
  Uname: Linux 4.18.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 07/19/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: TP202NAS.209
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: TP202NAS
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No  Asset  Tag
  dmi.chassis.type: 31
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrTP202NAS.209:bd07/19/2018:svnASUSTeKCOMPUTERINC.:pnTP202NAS:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnTP202NAS:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct31:cvr1.0:
  dmi.product.family: VivoBook Flip
  dmi.product.name: TP202NAS
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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