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[Roger Barrett <1493888@xxxxxxxxxxxxxxxxxx>]

@Mathew Hodson.

I removed the amdgpu blacklist entry I had manually added and used the
"Additional Drivers" tab of Software and Updates to switch to the Open
Source drivers.

This resulted in a fallback Unity desktop without GPU acceleration (
glxinfo reported gallium using llvmpipe, which is mesa's software
implementation of OpenGL as far as I know ). It was usable but slightly
laggy.

This process had left traces of fglrx-core and fglrx in the dpkg
database. When I purged these, and rebooted, LightDM worked, but Unity
hung on at ( first flickering, but eventually stable ) the desktop
background, with no other screen artifacts.

Manually installing the fglrx-updates set of packages from wily-proposed
then gave me the full binary driver accelerated desktop correctly
without the need to blacklist anything.

Subsequently switching to the open source drivers still fails to give me
GPU acceleration for X ( llvmpipe again ).

So something does not appear to be set or removed properly in the
process of going from Proprietary to Open Source drivers. I'll see if I
can find out what.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to fglrx-installer in Ubuntu.
https://bugs.launchpad.net/bugs/1493888

Title:
  FGLRX incompatible with gcc 5

Status in Release Notes for Ubuntu:
  Fix Released
Status in fglrx-installer package in Ubuntu:
  Fix Released
Status in fglrx-installer-updates package in Ubuntu:
  Fix Released
Status in fglrx-installer source package in Wily:
  Fix Committed
Status in fglrx-installer-updates source package in Wily:
  Fix Committed

Bug description:
  SRU Request:

  [Impact]

  The fglrx driver is not compatible with gcc 5.x. This causes the
  kernel module to crash on initialisation. As a result, users will boot
  into a black screen, as X will fail (except on Intel+AMD hybrid
  systems, where intel is used).

  [Test Case]
  1. Either install (or upgrade to) Ubuntu 15.10 and fglrx
  2. Reboot
  3. Check the display, and the output of the "dmesg | grep fglrx" command (to see the actual crash)

  Expected results: the system should be able to start X correctly.

  Actual results:
  The kernel module fails and X doesn't start.

  [Regression Potential]
  Low. Forcing fglrx to use gcc 4.9 is only a temporary workaround, and will be replaced with the proper fix once AMD makes it available.


  __________________________________________________________________________

  With a R9 280 and FGLRX on ubuntu 15.10 the graphics lock up. I am
  able to SSH into the machine. I booted the older kernel
  (4.1.0-3-generic) and it works with FGLRX. After purging FGLRX and
  using xserver-xorg-video-radeon I am able to get the graphics working,
  but even it has issues with my display port (The DVI ports are working
  correctly).

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: fglrx (not installed)
  ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0
  Uname: Linux 4.2.0-7-generic x86_64
  ApportVersion: 2.18-0ubuntu9
  Architecture: amd64
  Date: Wed Sep  9 09:29:54 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2011-01-07 (1705 days ago)
  InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  ProcEnviron:
   LANGUAGE=
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: fglrx-installer
  UpgradeStatus: Upgraded to wily on 2015-08-18 (21 days ago)

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