[Bug 982889] Re: X trying to start before plymouth has finished using the drm driver

[Bryce Harrington]

@Adam, interesting.  Indeed your problem also appears to be distinct
from the OP.  It looks like you have a hybrid graphics system and both
intel and nouveau drivers are loading.  It sounds like the nouveau
driver isn't detecting any connected outputs and eventually unloads
itself.  The modesetting driver decides to load up after that for some
reason, and immediately proceeds to segfault.

>From your comment #39 it sounds like with the patch, X is getting
further along?  Looking at your original bug (#1125759) you had been
seeing this problem early on, which broke everything subsequent to it:

[     3.579] (II) config/udev: Adding drm device (/dev/dri/card1)
[     4.377] (II) config/udev: Adding drm device (/dev/dri/card0)
[     4.377] setversion 1.4 failed  <--- oops
[     4.379] (--) PCI:*(0:0:2:0) 8086:0126:1028:0446 rev 9, Mem @ 0xf1400000/4194304, 0xe0000000/268435456, I/O @ 0x00004000/64
[     4.379] (--) PCI: (0:1:0:0) 10de:0df5:1028:0446 rev 161, Mem @ 0xf0000000/16777216, 0xc0000000/268435456, 0xd0000000/33554432, I/O @ 0x00003000/128, BIOS @ 0x????????/524288

Now you're seeing this:

[     3.610] (II) config/udev: Adding drm device (/dev/dri/card1)
[     5.309] (II) config/udev: Adding drm device (/dev/dri/card0)
[     5.311] (--) PCI:*(0:0:2:0) 8086:0126:1028:0446 rev 9, Mem @ 0xf1400000/4194304, 0xe0000000/268435456, I/O @ 0x00004000/64
[     5.311] (--) PCI: (0:1:0:0) 10de:0df5:1028:0446 rev 161, Mem @ 0xf0000000/16777216, 0xc0000000/268435456, 0xd0000000/33554432, I/O @ 0x00003000/128, BIOS @ 0x????????/524288

I would expect the patch to show some debug info if it is applying its
fix; it should display a stream of "drm device not ready (#), sleeping
for 20us" messages, and then the system should boot up to fully
functional (or some permutation thereof).  So, I'm not sure we can say
the patch fixed it for you; it could be just coincidental.  This is a
race condition after all, and as such can be influenced by all manner of
random things, and maybe it just had lucky timing on that boot.

As to the modesetting segfault, that would be worth tracking as its own
bug.  Did a crash file get generated for that in /var/crash/ ?

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to libdrm in Ubuntu.
https://bugs.launchpad.net/bugs/982889

Title:
  X trying to start before plymouth has finished using the drm driver

Status in “libdrm” package in Ubuntu:
  Triaged
Status in “linux” package in Ubuntu:
  Confirmed
Status in “xorg-server” package in Ubuntu:
  In Progress

Bug description:
  X server fails to start the first time after boot, it works fine when
  I start it again.

  Looks like a race condition with intel drm initialization, i guess X
  tries to start faster than drm driver is initialized so it fails.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+12ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  Uname: Linux 3.2.0-23-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.0.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Mon Apr 16 10:35:28 2012
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Micro-Star International Co., Ltd. Device [1462:7750]
   Advanced Micro Devices [AMD] nee ATI Barts XT [ATI Radeon HD 6800 Series] [1002:6738] (prog-if 00 [VGA controller])
     Subsystem: Giga-byte Technology Device [1458:21fa]
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
  MachineType: MSI MS-7750
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-23-generic root=/dev/mapper/ssd-ubuntu--precise ro quiet splash
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/25/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V4.0
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z68A-G43 (G3) (MS-7750)
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV4.0:bd08/25/2011:svnMSI:pnMS-7750:pvr1.0:rvnMSI:rnZ68A-G43(G3)(MS-7750):rvr1.0:cvnMSI:ct3:cvr1.0:
  dmi.product.name: MS-7750
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI
  version.compiz: compiz 1:0.9.7.6-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/982889/+subscriptions