I tried 3.15.0-031500rc2_3.15.0-031500rc2.201404201435 and this issue is gone, but there are these errors that freeze X :
May 2 11:04:23 lisak nvidia-persistenced: Started (2206) May 2 11:05:21 lisak kernel: [ 71.350777] apt-check[2392]: segfault at 17bf6 ip 0000000000017bf6 sp 00007fff02f32fe8 error 14 in python3.4[400000+354000] May 2 11:05:21 lisak kernel: [ 71.492139] apport[2393]: segfault at 17bf6 ip 0000000000017bf6 sp 00007fffea07f428 error 14 in python3.4[400000+354000] May 2 11:05:21 lisak kernel: [ 71.492162] Process 2393(apport) has RLIMIT_CORE set to 1 May 2 11:05:21 lisak kernel: [ 71.492164] Aborting core May 2 11:05:23 lisak kernel: [ 73.351741] apport-checkrep[2396]: segfault at 17bf6 ip 0000000000017bf6 sp 00007fff28a26378 error 14 in python3.4[400000+354000] May 2 11:05:23 lisak kernel: [ 73.493450] apport[2397]: segfault at 17bf6 ip 0000000000017bf6 sp 00007fffc1208e38 error 14 in python3.4[400000+354000] May 2 11:05:23 lisak kernel: [ 73.493473] Process 2397(apport) has RLIMIT_CORE set to 1 May 2 11:05:23 lisak kernel: [ 73.493475] Aborting core May 2 11:05:23 lisak kernel: [ 73.623298] apport-checkrep[2398]: segfault at 17bf6 ip 0000000000017bf6 sp 00007fffb3c755c8 error 14 in python3.4[400000+354000] May 2 11:05:24 lisak kernel: [ 73.764436] apport[2399]: segfault at 17bf6 ip 0000000000017bf6 sp 00007fff1a649818 error 14 in python3.4[400000+354000] May 2 11:05:24 lisak kernel: [ 73.764459] Process 2399(apport) has RLIMIT_CORE set to 1 May 2 11:05:24 lisak kernel: [ 73.764461] Aborting core That might relate to issue https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1299390 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1310406 Title: [regression] Trusty kernel doesn't recognize GeForce 8600m GT nor with nouveau or nvidia drivers Status in “linux” package in Ubuntu: Confirmed Bug description: When loading trusty (also from a brand new live-USB) in an Acer Aspire 5920G, that has a Nvidia 8600m GT card, the nouveau driver fails to load and the UI falls back to llvmpipe. Using noacpi kernel cmdline doesn't help. The highlights from dmesg are: [ 20.051842] nouveau 0000:01:00.0: enabling device (0004 -> 0007) [ 20.052191] [drm] hdmi device not found 1 0 1 [ 20.052340] nouveau E[ DEVICE][0000:01:00.0] unknown chipset, 0xffffffff [ 20.052346] nouveau E[ DRM] failed to create 0x80000080, -22 [ 20.052540] nouveau: probe of 0000:01:00.0 failed with error -22 Installing the Nvidia drivers 331 or current (304) gives out a similar error when loading the nvidia kernel module: [ 18.405583] nvidia: module license 'NVIDIA' taints kernel. [ 18.405588] Disabling lock debugging due to kernel taint [ 18.418853] nvidia: module verification failed: signature and/or required key missing - tainting kernel [ 18.426016] nvidia 0000:01:00.0: enabling device (0000 -> 0003) [ 18.426115] vgaarb: device changed decodes: PCI:0000:01:00.0,olddecodes=io+mem,decodes=none:owns=none [ 18.426161] NVRM: The NVIDIA GPU 0000:01:00.0 (PCI ID: 10de:0407) [ 18.426161] NVRM: installed in this system is not supported by the 331.38 [ 18.426161] NVRM: NVIDIA Linux driver release. Please see 'Appendix [ 18.426161] NVRM: A - Supported NVIDIA GPU Products' in this release's [ 18.426161] NVRM: README, available on the Linux driver download page [ 18.426161] NVRM: at www.nvidia.com. [ 18.426215] nvidia: probe of 0000:01:00.0 failed with error -1 [ 18.426869] NVRM: The NVIDIA probe routine failed for 1 device(s). [ 18.426872] NVRM: None of the NVIDIA graphics adapters were initialized! [ 18.426874] [drm] Module unloaded [ 18.426982] NVRM: NVIDIA init module failed! /var/log/gpu-manager.log: http://paste.ubuntu.com/7286246/ nvidia-bug-report.sh (contains full dmesg and Xorg.log): http://paste.ubuntu.com/7287180/ Fun fact is that the card is supported by the latest nvidia drivers as reported by their appendix [1]. Also they used to work in 12.04. So, I've manually installed the saucy kernel, and with it both nouveau and nvidia modules are loaded properly, making X to load the proper driver and GLX to work. Everything works also using the daily mainline kernel linux-image-3.15.0-999-generic_3.15.0-999.201404190220_amd64.deb. Thus this seems to indicate pretty clearly that the bug is inside the trusty linux kernel itself. [1] ftp://download.nvidia.com/XFree86/Linux- x86_64/331.38/README/supportedchips.html ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: luca 1967 F.... pulseaudio CurrentDesktop: Unity Date: Mon Apr 21 00:20:42 2014 HibernationDevice: RESUME=UUID=375bbd5e-c25c-4d6e-bfa4-66bed5e80cb0 InstallationDate: Installed on 2011-12-28 (844 days ago) InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) MachineType: Acer, inc. Aspire 5920G ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=d9d0e5ab-b408-439e-ae8b-c2bf704713bf ro quiet splash vt.handoff=7 noacpi RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127 SourcePackage: linux UpgradeStatus: Upgraded to trusty on 2014-04-19 (1 days ago) dmi.bios.date: 08/15/2007 dmi.bios.vendor: Acer dmi.bios.version: v1.3708 dmi.board.name: Chapala dmi.board.vendor: Acer, Inc. dmi.board.version: Not Applicable dmi.chassis.type: 1 dmi.chassis.vendor: Acer, Inc. dmi.chassis.version: N/A dmi.modalias: dmi:bvnAcer:bvrv1.3708:bd08/15/2007:svnAcer,inc.:pnAspire5920G:pvrNotApplicable:rvnAcer,Inc.:rnChapala:rvrNotApplicable:cvnAcer,Inc.:ct1:cvrN/A: dmi.product.name: Aspire 5920G dmi.product.version: Not Applicable dmi.sys.vendor: Acer, inc. 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