[Bug 1567048] [NEW] Booting the live CD requires nomodeset on iMac with AMD/ATI Mobility Radeon HD 4670 [1002:9488]

[Etienne URBAH]

Public bug reported:

When trying to boot the live CD of Ubuntu 16.04 Xenial Beta2 on an iMac
with AMD/ATI Mobility Radeon HD 4670 [1002:9488] :

-  With unchanged grub commands, I systematically get a black screen
(even Ctrl-Alt-F1 provides NO readable console).

-  With the 'nomodeset' parameter added to the 'linux' command of grub,
the graphical display works OK.

I suggest that syslinux better checks the hardware and takes appropriate
decisions automatically.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: syslinux 3:6.03+dfsg-11ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
Uname: Linux 4.4.0-15-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CasperVersion: 1.368
CurrentDesktop: GNOME
Date: Wed Apr  6 21:14:43 2016
Dependencies:
 gcc-6-base 6-20160319-0ubuntu1
 libc6 2.23-0ubuntu2
 libgcc1 1:6-20160319-0ubuntu1
 mtools 4.0.18-2
 syslinux-common 3:6.03+dfsg-11ubuntu1
LiveMediaBuild: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: syslinux
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: syslinux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1567048

Title:
  Booting the live CD requires nomodeset on iMac with AMD/ATI Mobility
  Radeon HD 4670 [1002:9488]

Status in syslinux package in Ubuntu:
  New

Bug description:
  When trying to boot the live CD of Ubuntu 16.04 Xenial Beta2 on an
  iMac with AMD/ATI Mobility Radeon HD 4670 [1002:9488] :

  -  With unchanged grub commands, I systematically get a black screen
  (even Ctrl-Alt-F1 provides NO readable console).

  -  With the 'nomodeset' parameter added to the 'linux' command of
  grub, the graphical display works OK.

  I suggest that syslinux better checks the hardware and takes
  appropriate decisions automatically.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: syslinux 3:6.03+dfsg-11ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
  Uname: Linux 4.4.0-15-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.368
  CurrentDesktop: GNOME
  Date: Wed Apr  6 21:14:43 2016
  Dependencies:
   gcc-6-base 6-20160319-0ubuntu1
   libc6 2.23-0ubuntu2
   libgcc1 1:6-20160319-0ubuntu1
   mtools 4.0.18-2
   syslinux-common 3:6.03+dfsg-11ubuntu1
  LiveMediaBuild: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323.1)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: syslinux
  UpgradeStatus: No upgrade log present (probably fresh install)

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