Xorg:在12.04.2LTS中没有在启动时找到屏幕

Question

我有一张英特尔IvyBridge视频卡。今天上午，我的12.04.02 LTS向我介绍了Xorg服务器崩溃。

• 尝试老版本的内核曾经工作过一次，但是在重新启动时会导致同样的错误。这个问题似乎与内核无关。
• 重新启动lightdm确实让我进入了GUI登录屏幕: sudo service lightdm停止sudo service lightdm start

所以现在我可以做一些诊断。我在第一个Xorg开始(崩溃)和第二个(成功)之间对Xorg日志进行了区分。它们看起来很相似，直到一定程度上。

好：

[   310.379] (II) intel: Driver for Intel Integrated Graphics Chipsets: i810,
    i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G, 915G,
    E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM, Pineview G,
    965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33, GM45,
    4 Series, G45/G43, Q45/Q43, G41, B43, B43, Clarkdale, Arrandale,
    Sandybridge Desktop (GT1), Sandybridge Desktop (GT2),
    Sandybridge Desktop (GT2+), Sandybridge Mobile (GT1),
    Sandybridge Mobile (GT2), Sandybridge Mobile (GT2+),
    Sandybridge Server, Ivybridge Mobile (GT1), Ivybridge Mobile (GT2),
    Ivybridge Desktop (GT1), Ivybridge Desktop (GT2), Ivybridge Server,
    Ivybridge Server (GT2)
[   310.379] (II) VESA: driver for VESA chipsets: vesa
[   310.379] (II) FBDEV: driver for framebuffer: fbdev
[   310.379] (++) using VT number 7

[   310.380] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
[   310.380] (WW) Falling back to old probe method for vesa
[   310.380] (WW) Falling back to old probe method for fbdev
[   310.380] (II) Loading sub module "fbdevhw"
[   310.380] (II) LoadModule: "fbdevhw"
[   310.380] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[   310.380] (II) Module fbdevhw: vendor="X.Org Foundation"
[   310.380]    compiled for 1.11.3, module version = 0.0.2
[   310.380]    ABI class: X.Org Video Driver, version 11.0
[   310.380] drmOpenDevice: node name is /dev/dri/card0
[   310.380] drmOpenDevice: open result is 9, (OK)
[   310.380] drmOpenByBusid: Searching for BusID pci:0000:00:02.0
[   310.380] drmOpenDevice: node name is /dev/dri/card0
[   310.380] drmOpenDevice: open result is 9, (OK)
[   310.380] drmOpenByBusid: drmOpenMinor returns 9
[   310.380] drmOpenByBusid: drmGetBusid reports pci:0000:00:02.0
[   310.380] (II) intel(0): Creating default Display subsection in Screen section

坏：

[     2.986] (II) intel: Driver for Intel Integrated Graphics Chipsets: i810,
    i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G, 915G,
    E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM, Pineview G,
    965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33, GM45,
    4 Series, G45/G43, Q45/Q43, G41, B43, B43, Clarkdale, Arrandale,
    Sandybridge Desktop (GT1), Sandybridge Desktop (GT2),
    Sandybridge Desktop (GT2+), Sandybridge Mobile (GT1),
    Sandybridge Mobile (GT2), Sandybridge Mobile (GT2+),
    Sandybridge Server, Ivybridge Mobile (GT1), Ivybridge Mobile (GT2),
    Ivybridge Desktop (GT1), Ivybridge Desktop (GT2), Ivybridge Server,
    Ivybridge Server (GT2)
[     2.986] (II) VESA: driver for VESA chipsets: vesa
[     2.986] (II) FBDEV: driver for framebuffer: fbdev
[     2.986] (++) using VT number 7

[     2.987] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
[     2.987] (WW) Falling back to old probe method for vesa
[     2.987] (WW) Falling back to old probe method for fbdev
[     2.987] (II) Loading sub module "fbdevhw"
[     2.987] (II) LoadModule: "fbdevhw"
[     2.987] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[     2.987] (II) Module fbdevhw: vendor="X.Org Foundation"
[     2.987]    compiled for 1.11.3, module version = 0.0.2
[     2.987]    ABI class: X.Org Video Driver, version 11.0
[     2.987] drmOpenDevice: node name is /dev/dri/card0
[     3.151] drmOpenDevice: open result is 9, (OK)
[     3.287] drmOpenByBusid: Searching for BusID pci:0000:00:02.0
[     3.287] drmOpenDevice: node name is /dev/dri/card0
[     3.287] drmOpenDevice: open result is 9, (OK)
[     3.287] drmOpenByBusid: drmOpenMinor returns 9
[     3.287] drmOpenByBusid: Interface 1.4 failed, trying 1.1
[     3.287] drmOpenByBusid: drmGetBusid reports 
[     3.287] drmOpenDevice: node name is /dev/dri/card1
[     3.291] drmOpenByBusid: drmOpenMinor returns -1
[     3.291] drmOpenDevice: node name is /dev/dri/card2
[     3.295] drmOpenByBusid: drmOpenMinor returns -1
[     3.295] drmOpenDevice: node name is /dev/dri/card3
[     3.299] drmOpenByBusid: drmOpenMinor returns -1
[     3.299] drmOpenDevice: node name is /dev/dri/card4
[     3.302] drmOpenByBusid: drmOpenMinor returns -1
[     3.302] drmOpenDevice: node name is /dev/dri/card5
[     3.306] drmOpenByBusid: drmOpenMinor returns -1
[     3.306] drmOpenDevice: node name is /dev/dri/card6
[     3.310] drmOpenByBusid: drmOpenMinor returns -1
[     3.310] drmOpenDevice: node name is /dev/dri/card7
[     3.314] drmOpenByBusid: drmOpenMinor returns -1
[     3.314] drmOpenDevice: node name is /dev/dri/card8
[     3.317] drmOpenByBusid: drmOpenMinor returns -1
[     3.317] drmOpenDevice: node name is /dev/dri/card9
[     3.321] drmOpenByBusid: drmOpenMinor returns -1
[     3.321] drmOpenDevice: node name is /dev/dri/card10
[     3.325] drmOpenByBusid: drmOpenMinor returns -1
[     3.325] drmOpenDevice: node name is /dev/dri/card11
[     3.329] drmOpenByBusid: drmOpenMinor returns -1
[     3.329] drmOpenDevice: node name is /dev/dri/card12
[     3.332] drmOpenByBusid: drmOpenMinor returns -1
[     3.332] drmOpenDevice: node name is /dev/dri/card13
[     3.336] drmOpenByBusid: drmOpenMinor returns -1
[     3.336] drmOpenDevice: node name is /dev/dri/card14
[     3.340] drmOpenByBusid: drmOpenMinor returns -1
[     3.340] drmOpenDevice: node name is /dev/dri/card15
[     3.344] drmOpenByBusid: drmOpenMinor returns -1
[     3.344] drmOpenDevice: node name is /dev/dri/card0
[     3.344] drmOpenDevice: open result is 9, (OK)
[     3.404] drmOpenDevice: node name is /dev/dri/card0
[     3.404] drmOpenDevice: open result is 9, (OK)
[     3.404] drmGetBusid returned ''
[     3.404] (EE) intel(0): [drm] failed to set drm interface version.
[     3.404] (EE) intel(0): Failed to become DRM master.
[     3.404] (II) intel(0): Creating default Display subsection in Screen section
    "Default Screen Section" for depth/fbbpp 24/32
[     3.404] (==) intel(0): Depth 24, (--) framebuffer bpp 32
[     3.404] (==) intel(0): RGB weight 888
[     3.404] (==) intel(0): Default visual is TrueColor
[     3.404] (II) intel(0): Integrated Graphics Chipset: Intel(R) Ivybridge Desktop (GT1)
[     3.404] (--) intel(0): Chipset: "Ivybridge Desktop (GT1)"
[     3.404] (II) UnloadModule: "intel"
[     3.404] (II) Unloading intel
[     3.404] (EE) Screen(s) found, but none have a usable configuration.
[     3.404] 
Fatal server error:
[     3.404] no screens found
[     3.404] 

更多问题：

• 为什么Xorg在启动时就崩溃了，为什么它在启动后不久就能正常启动？
• 这是个虫子吗？如果是的话，我会去提交报告的。

如果有人感兴趣的话，我可以把完整的日志寄出去。

Answer 1

好的，我找到了一个bug：https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/982889

有一个推荐的解决办法对我有用：

A workaround is to add some sleep to /etc/init/lightdm.conf:

    sleep 10
    exec lightdm

顺便说一秒钟就够了。