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I am running Ubuntu (elementary OS) connected to a normal monitor which works fine. I am now trying to connect it to a TV through HDMI port, but the TV is unable get any signal. Please help me out.

Output of: sudo lshw -C display

  *-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

Output of xrandr:

\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 does not show HDMI at all. Is this a problem?

monitor

Output of sudo get-edid | parse-edid

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

I am unable to understand what needs to be done here. Could you please explain. I still am not sure if my PC sending some output via the HDMI port. Please help!

closed as off-topic by karel, edwinksl, Zanna, Andrea Lazzarotto, Eric Carvalho Aug 23 '16 at 20:37

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This is not about Ubuntu. Questions about other Linux distributions can be asked on Unix & Linux, those about Windows on Super User, those about Apple products on Ask Different and generic programming questions on Stack Overflow." – karel, edwinksl, Zanna, Andrea Lazzarotto, Eric Carvalho
If this question can be reworded to fit the rules in the help center, please edit the question.

  • How were you connected to the monitor? HDMI as well? – tlhIngan Aug 21 '16 at 7:37
  • Did you set up TV to get as input HDMI? – Danibix Aug 21 '16 at 7:49
  • @tlhIngan i have connected to the monitor through VGA cable. Not HDMI. This is the first time I am trying the HDMI port on my desktop pc. – user283926 Aug 21 '16 at 9:33
  • @Danibix TV to receive HDMI input. Disconnected STB to TV HDMI and connected the cable to PC instead. – user283926 Aug 21 '16 at 9:35
  • 2
    This doesn't seem to be an elementary os question. This is more like a ubuntu / linux problem. – user283926 Aug 21 '16 at 16:32
3

If you are trying to do a dual display, look into your "System Settings" for "Screen Display". There is usually a setting for "mirror display" (same thing on both screens) or "extend display" (have your desktop use both screens). On many installations, these don't turn on just by plugging a 2nd screen in.

If this is a single display and you are trying to replace a monitor by a TV, make sure that:

  • your TV can handle the resolution and refresh rates that the graphics card is trying to output
  • your TV is set to the correct HDMI outout that you've plugged into (my TV has 4, and you can cycle through them using the "input" button on the remote)
  • try another HDMI connector on the TV
  • make sure your graphics card is sending a signal through HDMI. You may need to edit your xorg.conf file for this, see details here.
  • I have attached a screenshot above of the display settings. Mirror displays is turned off. – user283926 Aug 21 '16 at 10:07

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