Skylake集成显卡无法在15.10上运行
在过去的几天里，我一直在网上搜索，试图让我的英特尔i5-6400上的集成显卡工作，但到目前为止还没有运气。
我正在运行一个新的Ubuntu 15.10并安装了4.3.4内核。 我的AMD R9 380工作正常（使用开源驱动程序），但我希望将其传递给虚拟机，因此我需要使集成的i915 GPU正常工作。
我有一个显示器，用DVI连接到R9 380，用VGA线连接到集成显卡。 在“显示”设置面板中，仅检测到一个显示，其中应该有两个。
有谁知道如何解决这个问题？
当前内核：
$ uname -r 4.3.4-040304-generic 集成GPU识别：
$ dmesg | grep -i i915 5:[ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-4.3.4-040304-generic root=/dev/mapper/vg--raid-lv--linux ro nomdmonddf nomdmonisw i915.preliminary_hw_support=1 intel_iommu=on 197:[ 0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-4.3.4-040304-generic root=/dev/mapper/vg--raid-lv--linux ro nomdmonddf nomdmonisw i915.preliminary_hw_support=1 intel_iommu=on 748:[ 0.869204] i915 0000:00:02.0: enabling device (0000 -> 0003) 902:[ 1.485539] [drm] Initialized i915 1.6.0 20150731 for 0000:00:02.0 on minor 1 903:[ 1.524441] i915 0000:00:02.0: fb1: inteldrmfb frame buffer device 1063:[ 119.646979] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915]) $ sudo lshw -enable pci -class display *-display description: VGA compatible controller product: Tonga PRO [Radeon R9 285/380] vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 0 bus info: pci@0000:01:00.0 version: f1 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi vga_controller bus_master cap_list rom configuration: driver=amdgpu latency=0 resources: irq:128 memory:c0000000-cfffffff memory:d0000000-d01fffff ioport:e000(size=256) memory:df100000-df13ffff memory:df140000-df15ffff *-display description: Display controller product: Sky Lake Integrated Graphics vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 06 width: 64 bits clock: 33MHz capabilities: pciexpress msi pm bus_master cap_list configuration: driver=i915 latency=0 resources: irq:129 memory:de000000-deffffff memory:b0000000-bfffffff ioport:f000(size=64)
以上一切对我来说都很好。 但是，以下命令显示确实存在错误。 请注意以Display Server: X.Org开头的行Display Server: X.Org表示FAILED: intel 。
$ inxi -b System: Host: anthony-linux Kernel: 4.3.4-040304-generic x86_64 (64 bit) Desktop: Xfce 4.12.3 Distro: Ubuntu 15.10 wily Machine: System: Gigabyte product: N/A Mobo: Gigabyte model: H110M-S2H-CF v: xx Bios: American Megatrends v: F1 date: 09/08/2015 CPU: Quad core Intel Core i5-6400 (-MCP-) speed/max: 799/3300 MHz Graphics: Card-1: Intel Sky Lake Integrated Graphics Card-2: Advanced Micro Devices [AMD/ATI] Tonga PRO [Radeon R9 285/380] Display Server: X.Org 1.17.2 drivers: ati (unloaded: fbdev,vesa,radeon) FAILED: intel Resolution: 1680x1050@59.88hz GLX Renderer: Gallium 0.4 on AMD TONGA (DRM 3.1.0, LLVM 3.6.2) GLX Version: 3.0 Mesa 11.0.2 Network: Card: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169 Drives: HDD Total Size: 2060.4GB (22.5% used) RAID: Devices: 1: /dev/md1 2: /dev/md0 Info: Processes: 247 Uptime: 41 min Memory: 1223.8/15993.4MB Client: Shell (bash) inxi: 2.2.16
编辑1：以下是人们要求的更多细节：
$ dpkg -l xserver-xorg-video-intel ii xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4 amd64 X.Org X server -- Intel i8xx, i9xx display driver
编辑2：这是xrandr输出。 请注意，AMD R9 380具有1个DisplayPort，1个HDMI和2个DVI输出。 iGPU有1个VGA，1个DVI和1个HDMI。 不知道为什么这里只列出一个DVI输出，但很明显iGPU输出不存在，因为那时VGA将在列表中。
$ xrandr | grep connected 2:DisplayPort-1 disconnected (normal left inverted right x axis y axis) 3:HDMI-3 disconnected (normal left inverted right x axis y axis) 4:DVI-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
编辑3：系统似乎确实知道输出：
$ ls -l /sys/class/drm total 0 lrwxrwxrwx 1 root root 0 Jan 24 18:51 card0 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card0-DP-1 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card0-HDMI-A-1 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card0-HDMI-A-2 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card0-HDMI-A-3 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-3 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1-DP-2 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1-DVI-D-1 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DVI-D-1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1-DVI-I-1 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DVI-I-1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1-HDMI-A-4 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-HDMI-A-4 lrwxrwxrwx 1 root root 0 Jan 24 18:53 controlD64 -> ../../devices/pci0000:00/0000:00:02.0/drm/controlD64 lrwxrwxrwx 1 root root 0 Jan 24 18:53 controlD65 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/controlD65 lrwxrwxrwx 1 root root 0 Jan 24 18:53 renderD128 -> ../../devices/pci0000:00/0000:00:02.0/drm/renderD128 lrwxrwxrwx 1 root root 0 Jan 24 18:53 renderD129 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/renderD129 lrwxrwxrwx 1 root root 0 Jan 24 18:53 ttm -> ../../devices/virtual/drm/ttm -r--r--r-- 1 root root 4.0K Jan 24 18:53 version
编辑4：在启动过程中，iGPU输出似乎有效。 我在启动过程中得到了dmesg输出，但它在某个时刻停止了。 在以[dmr]开头的行之后，iGPU的输出停止。 以fbcon开头的那些在它上面不可见：
$ dmesg | grep -A3 "\[drm\] fb" [ 1.357205] [drm] fb mappable at 0xC0C73000 [ 1.357810] [drm] vram apper at 0xC0000000 [ 1.358418] [drm] size 7299072 [ 1.359027] [drm] fb depth is 24 [ 1.359653] [drm] pitch is 6912 [ 1.360531] fbcon: amdgpudrmfb (fb1) is primary device [ 1.360532] fbcon: Remapping primary device, fb1, to tty 1-63
这是整个Xorg.0.log内容： http ：//pastebin.com/BprgEdSj。 下面是一些片段。 第一个似乎与AMD GPU有关：
$ grep '(EE)' /var/log/Xorg.0.log 15: (WW) warning, (EE) error, (NI) not implemented, (??) unknown. 73:[ 26.937] (EE) Failed to load module "fglrx" (module does not exist, 0) 123:[ 27.200] (EE) Failed to load module "fglrx" (module does not exist, 0) 751:[ 29.273] (EE) modeset(0): [DRI2] No driver mapping found for PCI device 0x1002 / 0x6939 752:[ 29.273] (EE) modeset(0): Failed to initialize the DRI2 extension. 756:[ 29.277] (EE) AIGLX: reverting to software rendering
以下是我手动挑选的部分内容：
$ less /var/log/Xorg.0.log (then manual copy/paste) [ 27.200] (II) LoadModule: "intel" [ 27.201] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so [ 27.201] (II) Module intel: vendor="X.Org Foundation" [ 27.201] compiled for 1.17.2, module version = 2.99.917 [ 27.201] Module class: X.Org Video Driver [ 27.201] ABI class: X.Org Video Driver, version 19.0 [ 27.201] (II) UnloadModule: "intel" [ 27.201] (II) Unloading intel [ 27.201] (II) Failed to load module "intel" (already loaded, 0) ... [ 27.210] (II) intel: Driver for Intel(R) 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 ... [ 27.211] (II) intel(G0): Using Kernel Mode Setting driver: i915, version 1.6.0 20150731 [ 27.211] (II) intel(G0): SNA compiled: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4 (Robert Ancell ) [ 27.211] (II) intel(G0): SNA compiled for use with valgrind
$ xrandr | grep connected 2:DisplayPort-1 disconnected (normal left inverted right x axis y axis) 3:HDMI-3 disconnected (normal left inverted right x axis y axis) 4:DVI-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
Xorg只知道3个video输出。
$ ls -l /sys/class/drm total 0 lrwxrwxrwx 1 root root 0 Jan 24 18:51 card0 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card0-DP-1 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card0-HDMI-A-1 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card0-HDMI-A-2 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card0-HDMI-A-3 -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-3 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1-DP-2 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1-DVI-D-1 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DVI-D-1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1-DVI-I-1 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DVI-I-1 lrwxrwxrwx 1 root root 0 Jan 24 18:53 card1-HDMI-A-4 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-HDMI-A-4
内核检测到2个video卡，两个输出都有多个输出。
$ grep '(EE)' /var/log/Xorg.0.log 751:[ 29.273] (EE) modeset(0): [DRI2] No driver mapping found for PCI device 0x1002 / 0x6939 752:[ 29.273] (EE) modeset(0): Failed to initialize the DRI2 extension. 756:[ 29.277] (EE) AIGLX: reverting to software rendering
AMD R9 285卡已经退回到软件渲染，因为PCI ID 1002：6939无法识别。 您可以通过升级radeon驱动程序来解决这个问题，但是对于VGA passthrough，您实际上并不需要Xorg来工作。
$ `grep 'Monitor name' /var/log/Xorg.0.log [ 29.080] (II) modeset(0): Monitor name: W2252 [ 29.173] (II) intel(G0): Monitor name: W2252
两个驱动程序都检测到监视器。
对于AMD GPU的VGA直通，您需要Xorg才能使用Intel GPU。 您可以创建仅配置了Intel设备的xorg.conf （ Xorg :0 -configure然后编辑并删除对AMD设备的引用）。 或者，只需删除正在使用的非Intel驱动程序（在这种情况下为apt-get purge xserver-xorg-video-modesetting ） – 但是请注意，如果您不这样做，可能必须从USB启动才能重新安装此软件包有video。
但在这种情况下，通过将BIOS / UEFI配置为使用Intel iGPU作为POST的默认值来解决问题。 这可能表明问题是由Linux Skylake初始化代码中的错误引起的，如果BIOS已经初始化，它会正确设置显示，但是否则会失败。