Ubuntu无法识别HDMI端口

我正在运行连接到正常监视器的Ubuntu（基本OS），它工作正常。我现在正在尝试通过HDMI端口将其连接到电视，但是电视无法获得任何信号。请帮帮我。

输出：sudo lshw -C显示

  *-display               
   description: VGA compatible controller
   product: RS780L [Radeon 3000]
   vendor: Hynix Semiconductor (Hyundai Electronics)
   physical id: 5
   bus info: pci@0000:01:05.0
   version: 00
   width: 32 bits
   clock: 33MHz
   capabilities: pm msi vga_controller bus_master cap_list rom
   configuration: driver=radeon latency=0
   resources: irq:18 memory:d0000000-dfffffff ioport:d000(size=256) memory:feaf0000-feafffff memory:fe900000-fe9fffff

xrandr的输出：

\Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
VGA-0 connected 1366x768+0+0 (normal left inverted right x axis y axis) 410mm x 230mm
1366x768       59.8*+
1024x768       75.1     60.0  
800x600        75.0     60.3  
640x480        75.0     60.0  
720x400        70.1  
DVI-0 disconnected (normal left inverted right x axis y axis)

xrandr根本不显示HDMI。这有问题吗？

sudo get-edid的输出 解析的

parse-edid: parse-edid version 2.0.0
get-edid: get-edid version 2.0.0

Performing real mode VBE call
Interrupt 0x10 ax=0x4f00 bx=0x0 cx=0x0
Function supported
Call successful

VBE version 300
VBE string at 0xc01d0 "ATI ATOMBIOS"

VBE/DDC service about to be called
Report DDC capabilities

Performing real mode VBE call
Interrupt 0x10 ax=0x4f15 bx=0x0 cx=0x0
Function supported
Call successful

Monitor and video card combination does not support DDC1 transfers
Monitor and video card combination supports DDC2 transfers
0 seconds per 128 byte EDID block transfer
Screen is not blanked during DDC transfer

Reading next EDID block

VBE/DDC service about to be called
    Read EDID

    Performing real mode VBE call
    Interrupt 0x10 ax=0x4f15 bx=0x1 cx=0x0
    Function supported
    Call successful

parse-edid: EDID checksum passed.

# EDID version 1 revision 3
Section "Monitor"
# Block type: 2:0 3:ff
# Block type: 2:0 3:fc
Identifier "DELL IN1930"
VendorName "DEL"
ModelName "DELL IN1930"
# Block type: 2:0 3:ff
# Block type: 2:0 3:fc
# Block type: 2:0 3:fd
HorizSync 30-83
VertRefresh 56-75
# Max dot clock (video bandwidth) 90 MHz
# DPMS capabilities: Active off:yes  Suspend:yes  Standby:yes

Mode    "1366x768"  # vfreq 59.790Hz, hfreq 47.712kHz
    DotClock    85.500000
    HTimings    1366 1436 1579 1792
    VTimings    768 771 774 798
    Flags   "+HSync" "+VSync"
EndMode
# Block type: 2:0 3:ff
# Block type: 2:0 3:fc
# Block type: 2:0 3:fd
EndSection

我无法理解这里需要做什么。你能解释一下吗？我仍然不确定我的PC是否通过HDMI端口发送一些输出。请帮忙！

如果要进行双重显示，请在“系统设置”中查看“屏幕显示”。通常有一个“镜像显示”（两个屏幕都相同）或“扩展显示”（您的桌面同时使用两个屏幕）的设置。在许多安装中，仅通过插入第二个屏幕就无法打开这些安装。

如果这是单个显示器，并且您正在尝试用电视替换显示器，请确保：

• 您的电视可以处理图形卡试图输出的分辨率和刷新率
• 您的电视设置为您插入的正确的HDMI输出（我的电视有4个，您可以使用遥控器上的“输入”按钮在它们之间循环播放）
• 尝试在电视上使用另一个HDMI接口
• 确保您的图形卡正在通过HDMI发送信号。xorg.conf为此，您可能需要编辑文件，请在此处查看详细信息。