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[Ales <1531439@xxxxxxxxxxxxxxxxxx>]

Thank you for you replay.

I've done this:  In non accelerated mode after recovery boot switch to
X.Org X server display driver, restart, switch back to fglrx, restart
and it works. So I guess the reinstall of fglrx was needed.

I updated the BIOS but obviously the problem is not reproducible (after
fglrx reinstallation it works).

I don't think it's related to BIOS but rather to a hybrid graphic card i
have (Intel Haswell + AMD Radeon R5 M255).

My another bug regarding hardware acceleration:
(https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1525721).

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1531439

Title:
  Freeze after kernel upgrade to 4.0.23

Status in linux package in Ubuntu:
  Invalid

Bug description:
  After the recent kernel upgrade 2.4.0-23 the computer freezes (see the
  screenshot) and I'm not able to login neither into a graphic mode nor
  the text console.

  When I try previous kernel 4.2.0-22 the result is the same even if it
  worked before.

  When I go to the recovery mode (Grub menu > Advanced options > Linux
  4.2.0-23-generic (recovery mode)) and just select "Resume normal boot"
  it boots as normal and I can login into KDE. But I guess it is in some
  non accelerated graphics mode.

  * Kubuntu 15.10, uname: 4.2.0-23-generic #28-Ubuntu SMP Sun Dec 27 17:47:31 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux.
  * AMD Radeon R5 M255, using fglrx-updates

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
  Uname: Linux 4.2.0-23-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: KDE
  Date: Wed Jan  6 09:59:24 2016
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: kubuntu
  DkmsStatus:
   fglrx-updates-core, 15.201, 4.2.0-19-generic, x86_64: installed
   fglrx-updates-core, 15.201, 4.2.0-21-generic, x86_64: installed
   fglrx-updates-core, 15.201, 4.2.0-22-generic, x86_64: installed
   fglrx-updates-core, 15.201, 4.2.0-23-generic, x86_64: installed
  ExtraDebuggingInterest: I just need to know a workaround
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:2248]
     Subsystem: Hewlett-Packard Company Device [103c:224a]
  InstallationDate: Installed on 2015-10-23 (74 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Hewlett-Packard HP ProBook 450 G2
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-23-generic root=UUID=c9e0c6ee-c8a4-4d1a-a46e-a3b79c38f774 ro recovery nomodeset
  Renderer: Software
  SourcePackage: xorg
  UdevLog: Error: [Errno 2] Adresář nebo soubor neexistuje: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/20/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: M74 Ver. 01.05
  dmi.board.name: 2248
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 67.22
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrM74Ver.01.05:bd09/20/2014:svnHewlett-Packard:pnHPProBook450G2:pvrA3008CD10003:rvnHewlett-Packard:rn2248:rvrKBCVersion67.22:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 450 G2
  dmi.product.version: A3008CD10003
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz N/A
  version.fglrx-installer: fglrx-installer N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Wed Jan  6 09:49:37 2016
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9.1

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