我正在运行 Ubuntu 13.10，出于某种原因，当我重新启动计算机时，我的 HDMI 不再被识别。发生了什么事？我该如何解决这个问题？
这是我的输出lspci -v -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Micro-Star International Co., Ltd. Device 2111
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at f000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
并xrandr输出：
Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 32767 x 32767
VGA1 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 430mm x 270mm
1680x1050 60.0*+
1280x1024 75.0 60.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
HDMI 未断开连接，应读取。进入显示后，我没有看到第二个屏幕。我已经看到多个与此相关的问题跟踪，但尚未解决。
https://askubuntu.com/questions/345622/hdmi-stopped-working-ubuntu-13-04
这看起来像是显卡问题，但我怀疑我之前会注意到这个问题，而不是现在。也许这与我重启之前进行的 ubuntu 更新有关???
下面我添加了我的主板的规格。我使用的是集成显卡。
description: Desktop Computer
product: MS-7758 (To be filled by O.E.M.)
vendor: MSI
version: 1.0
serial: To be filled by O.E.M.
width: 32 bits
capabilities: smbios-2.7 dmi-2.7 smp-1.4 smp
configuration: boot=normal chassis=desktop cpus=4 family=To be filled by O.E.M. sku=To be filled by O.E.M. uuid=00000000-0000-0000-0000-D43D7E921319
*-core
description: Motherboard
product: Z77A-G43 (MS-7758)
vendor: MSI
physical id: 0
version: 1.0
serial: To be filled by O.E.M.
slot: To be filled by O.E.M.
*-firmware
description: BIOS
vendor: American Megatrends Inc.
physical id: 0
version: V2.7
date: 10/24/2012
size: 64KiB
capacity: 8128KiB
capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification uefi