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I have a Sony Bravia KDL-40CX520 TV connected to my Mythbuntu box (Ubuntu 16.04.6 LTS) via HDMI. The TV is detected and shows up correctly under Settings-> Display. The box is running an AMD-A4 APU, with open source radeon driver. There is no other graphics card installed.

If the TV is turned on while MythTV is already running, or the TV is turned off and then on again, result is just a blank screen with no video/audio. The only way to restore the display would be to reboot the system while the TV remains on.

I can remote in via ssh and run xrandr. The only difference I see when there is no signal is that the (*) asterisk indicating the current mode disappears:

mythtvuser@mythtv-1:~$ xrandr -display :0.0

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384

HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 886mm x 498mm

   1920x1080     60.00*+  50.00    59.94    30.00    24.00    29.97    23.98  

   1920x1080i    60.00    50.00    59.94  

   1280x1024     60.02  

   1280x720      60.00    50.00    30.00    59.94    29.97    24.00    23.98  

   1024x768      60.00  

   800x600       60.32  

   720x576       50.00  

   720x576i      50.00  

   720x480       60.00    59.94  

   720x480i      60.00    59.94  

   640x480       60.00    59.94  

HDMI-1 disconnected (normal left inverted right x axis y axis)

DVI-0 disconnected (normal left inverted right x axis y axis)

Running:

xrandr --auto

or via ssh:

xrandr --auto -display :0.0

will reset things back to working order.

I'm wondering why the current mode changes to nothing (!) when the TV turns off and what can be done to always force the display setting to stay at 1920x1080?

I thought xorg.conf might work but there is no such file in /etc/X11/ and I'm having the same issue creating it ("no devices to configure. Configuration failed") as detailed in
Turn off vsync (Radeon) and create xorg.conf

So right now, I could implement a workaround, but I'm interested in a fix to the problem itself.

One thing that I have noticed, is the issue only occurs when in graphics mode. If I switch to tty (Ctrl + Alt + 1), I'm able to turn the TV off and on without losing the signal.

I suspect the problem is X related, or there is some desktop configuration option, but not really sure what to do from here. Any advice is appreciated.

xfce hdmi mythbuntu

share|improve this question

asked 15 mins ago

SylvesterSylvester

11

New contributor

Sylvester is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

I have a Sony Bravia KDL-40CX520 TV connected to my Mythbuntu box (Ubuntu 16.04.6 LTS) via HDMI. The TV is detected and shows up correctly under Settings-> Display. The box is running an AMD-A4 APU, with open source radeon driver. There is no other graphics card installed.

If the TV is turned on while MythTV is already running, or the TV is turned off and then on again, result is just a blank screen with no video/audio. The only way to restore the display would be to reboot the system while the TV remains on.

I can remote in via ssh and run xrandr. The only difference I see when there is no signal is that the (*) asterisk indicating the current mode disappears:

mythtvuser@mythtv-1:~$ xrandr -display :0.0

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384

HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 886mm x 498mm

   1920x1080     60.00*+  50.00    59.94    30.00    24.00    29.97    23.98  

   1920x1080i    60.00    50.00    59.94  

   1280x1024     60.02  

   1280x720      60.00    50.00    30.00    59.94    29.97    24.00    23.98  

   1024x768      60.00  

   800x600       60.32  

   720x576       50.00  

   720x576i      50.00  

   720x480       60.00    59.94  

   720x480i      60.00    59.94  

   640x480       60.00    59.94  

HDMI-1 disconnected (normal left inverted right x axis y axis)

DVI-0 disconnected (normal left inverted right x axis y axis)

Running:

xrandr --auto

or via ssh:

xrandr --auto -display :0.0

will reset things back to working order.

I'm wondering why the current mode changes to nothing (!) when the TV turns off and what can be done to always force the display setting to stay at 1920x1080?

I thought xorg.conf might work but there is no such file in /etc/X11/ and I'm having the same issue creating it ("no devices to configure. Configuration failed") as detailed in
Turn off vsync (Radeon) and create xorg.conf

So right now, I could implement a workaround, but I'm interested in a fix to the problem itself.

One thing that I have noticed, is the issue only occurs when in graphics mode. If I switch to tty (Ctrl + Alt + 1), I'm able to turn the TV off and on without losing the signal.

I suspect the problem is X related, or there is some desktop configuration option, but not really sure what to do from here. Any advice is appreciated.

xfce hdmi mythbuntu

share|improve this question

asked 15 mins ago

SylvesterSylvester

11

New contributor

Sylvester is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I have a Sony Bravia KDL-40CX520 TV connected to my Mythbuntu box (Ubuntu 16.04.6 LTS) via HDMI. The TV is detected and shows up correctly under Settings-> Display. The box is running an AMD-A4 APU, with open source radeon driver. There is no other graphics card installed.

If the TV is turned on while MythTV is already running, or the TV is turned off and then on again, result is just a blank screen with no video/audio. The only way to restore the display would be to reboot the system while the TV remains on.

I can remote in via ssh and run xrandr. The only difference I see when there is no signal is that the (*) asterisk indicating the current mode disappears:

mythtvuser@mythtv-1:~$ xrandr -display :0.0

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384

HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 886mm x 498mm

   1920x1080     60.00*+  50.00    59.94    30.00    24.00    29.97    23.98  

   1920x1080i    60.00    50.00    59.94  

   1280x1024     60.02  

   1280x720      60.00    50.00    30.00    59.94    29.97    24.00    23.98  

   1024x768      60.00  

   800x600       60.32  

   720x576       50.00  

   720x576i      50.00  

   720x480       60.00    59.94  

   720x480i      60.00    59.94  

   640x480       60.00    59.94  

HDMI-1 disconnected (normal left inverted right x axis y axis)

DVI-0 disconnected (normal left inverted right x axis y axis)

Running:

xrandr --auto

or via ssh:

xrandr --auto -display :0.0

will reset things back to working order.

I'm wondering why the current mode changes to nothing (!) when the TV turns off and what can be done to always force the display setting to stay at 1920x1080?

I thought xorg.conf might work but there is no such file in /etc/X11/ and I'm having the same issue creating it ("no devices to configure. Configuration failed") as detailed in
Turn off vsync (Radeon) and create xorg.conf

So right now, I could implement a workaround, but I'm interested in a fix to the problem itself.

One thing that I have noticed, is the issue only occurs when in graphics mode. If I switch to tty (Ctrl + Alt + 1), I'm able to turn the TV off and on without losing the signal.

I suspect the problem is X related, or there is some desktop configuration option, but not really sure what to do from here. Any advice is appreciated.

xfce hdmi mythbuntu

share|improve this question

asked 15 mins ago

SylvesterSylvester

11

New contributor

Sylvester is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

mythtvuser@mythtv-1:~$ xrandr -display :0.0

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384

HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 886mm x 498mm

   1920x1080     60.00*+  50.00    59.94    30.00    24.00    29.97    23.98  

   1920x1080i    60.00    50.00    59.94  

   1280x1024     60.02  

   1280x720      60.00    50.00    30.00    59.94    29.97    24.00    23.98  

   1024x768      60.00  

   800x600       60.32  

   720x576       50.00  

   720x576i      50.00  

   720x480       60.00    59.94  

   720x480i      60.00    59.94  

   640x480       60.00    59.94  

HDMI-1 disconnected (normal left inverted right x axis y axis)

DVI-0 disconnected (normal left inverted right x axis y axis)

share|improve this question

asked 15 mins ago

SylvesterSylvester

11

New contributor

Sylvester is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 15 mins ago

SylvesterSylvester

11

New contributor

Sylvester is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 15 mins ago

SylvesterSylvester

11

New contributor

Sylvester is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 15 mins ago

SylvesterSylvester

11