It sounds like the fairly typical error that UXA is eating the vblank notification whilst DPMS off and not informing the client that they are no longer ignored.
How about trying Option "Triplebuffer" "false"? -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1273832 Title: [i915] Lockscreen/lid-close xserver freeze if UXA accel used. Status in “xserver-xorg-video-intel” package in Ubuntu: New Bug description: On a Haswell system, if AccelMethod UXA selected in xorg.conf, xserver freezes (moveable cursor, but frozen and unresponsive desktop) each time the screen is locked (either via inactivity or lid close on laptop) . This freeze does not occur if "SNA" AccelMethod is selected. This freeze can also be avoided if vblank_mode=0 is used, even if UXA acceleration selected. 1) Ubuntu release: 13.10, but I also tested this on 12.04 LTS, in which case I got exactly the same bug, only the frozen screen was blank rather than frozen desktop image. 2) Expected result: No freeze when locking screen/closing lid. Just the login screen greeter. 3) How to reproduce: On Haswell system, in xorg.conf: Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "UXA" #bug occurs # Option "AccelMethod" "SNA" #(default) no bug! EndSection reboot. Try closing the lid or locking screen a number of times (normally within a few attempts you will see the freeze). 4) Resolution: Short term solution is to switch to a tty and back. Alternatively, boot with the SNA acceleration method instead. Another alternative: use a dri config file in home directory: ~/.drirc containing <device screen="0" driver="dri2"> <application name="Default"> <option name="vblank_mode" value="0"/> </application> </device> to turn off vsync. 5) Importance for fglrx driver users with AMD cards: fglrx and pxpress by default force the i915 driver to use "UXA" mode, thus when selecting the iGPU users of fglrx will experience this freezing bug. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: xserver-xorg-video-intel 2:2.99.904-0ubuntu2.1 ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10 Uname: Linux 3.11.0-15-generic x86_64 NonfreeKernelModules: fglrx .tmp.unity.support.test.0: ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true Date: Tue Jan 28 20:43:34 2014 DistUpgraded: Fresh install DistroCodename: saucy DistroVariant: ubuntu DkmsStatus: fglrx, 13.251, 3.11.0-15-generic, x86_64: installed ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:2216] Subsystem: Lenovo Device [17aa:2216] InstallationDate: Installed on 2014-01-17 (10 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: LENOVO 20B3CTO1WW MarkForUpload: True ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic.efi.signed root=UUID=8a15962e-ad4d-4eb0-96af-37d167313e92 ro SourcePackage: xserver-xorg-video-intel UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/28/2013 dmi.bios.vendor: LENOVO dmi.bios.version: GPET53WW (1.53 ) dmi.board.asset.tag: Not Available dmi.board.name: 20B3CTO1WW dmi.board.vendor: LENOVO dmi.board.version: 0B98405 Std dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrGPET53WW(1.53):bd11/28/2013:svnLENOVO:pn20B3CTO1WW:pvrThinkPadS5-S540:rvnLENOVO:rn20B3CTO1WW:rvr0B98405Std:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 20B3CTO1WW dmi.product.version: ThinkPad S5-S540 dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1 version.fglrx-installer: fglrx-installer N/A version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.46-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3 version.xserver-xorg-core: xserver-xorg-core 2:1.14.5-1ubuntu2~saucy1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2.1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1 xserver.bootTime: Tue Jan 28 19:11:22 2014 xserver.configfile: /etc/X11/xorg.conf xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.14.5-1ubuntu2~saucy1 xserver.video_driver: intel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1273832/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
