6 个月前，我将 LG5500 用作 Acer Aspire E1-472g 笔记本电脑的外接显示器，通过 HDMI 端口连接，两天前，电视开始响应“无信号”。这可能是由于连接时我的笔记本电脑进入睡眠模式，然后我的电视也进入睡眠模式而引发的。我可以使用 VGA 电缆连接，但由于分辨率限制，效果不太好。当我查看“系统设置...”>“显示”时，出现了我的 HDMI 连接到电视的情况，但电视报告“无信号”。我尝试使用另一根 HDMI 电缆在我的 DVD 播放器上测试，效果很好。欢迎提出任何建议。以下信息：
barry@barry-Aspire-E1-472G:~$ sudo lshw -C display; lsb_release -a; uname -a; sudo dmidecode -t 1
[sudo] password for barry:
*-display
description: VGA compatible controller
product: Haswell-ULT Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:63 memory:f3000000-f33fffff memory:d0000000-dfffffff ioport:5000(size=64)
*-display
description: 3D controller
product: GF117M [GeForce 610M/710M/820M / GT 620M/625M/630M/720M]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:04:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=nouveau latency=0
resources: irq:66 memory:f2000000-f2ffffff memory:e0000000-efffffff memory:f0000000-f1ffffff ioport:3000(size=128)
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
Linux barry-Aspire-E1-472G 3.13.0-49-generic #83-Ubuntu SMP Fri Apr 10 20:11:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
# dmidecode 2.12
# SMBIOS entry point at 0xcaf09000
SMBIOS 2.7 present.
Handle 0x000C, DMI type 1, 27 bytes
System Information
Manufacturer: Acer
Product Name: Aspire E1-472G
Version: V2.11
Serial Number: NXMK1ST00741907E186600
UUID: 46B32C88-B5B4-EC40-A00B-C460DFEB9018
Wake-up Type: Other
SKU Number: Aspire E1-472G_0762_2.11
Family: Aspire E1-472G