Second Monitor Detected but no Display

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Second Monitor Detected but no Display

Postby awesome0possum » 2020-05-15 00:44

I'm at a bit of a lose with this one, I've been scouring google for a few hours and still haven't gotten anywhere.

I recently installed Debian 10 and it detects my second monitor, and when I enable dual monitors it turns on, but there is nothing displayed on it. Just a blank black screen.

There was one instance a couple day's ago where I left it connected and in dual monitor mode for a few hours and it finally started getting a video feed after a while, but I haven't been able to get it to do it since, and it came on rather randomly while I was across the room.

Any help here would be greatly appreciated.

The output of xrandr is

Code: Select all
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
VGA-0 connected (normal left inverted right x axis y axis)
   1680x1050     59.95 +
   1280x1024     75.02    60.02 
   1152x864      75.00 
   1024x768      75.03    60.00 
   800x600       75.00    60.32 
   640x480       75.00    59.94 
   720x400       70.08 
HDMI-0 disconnected (normal left inverted right x axis y axis)
LVDS connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 345mm x 194mm
   1920x1080     59.93*+
   1680x1050     60.00 
   1400x1050     60.00 
   1280x1024     59.95 
   1440x900      59.99 
   1280x960      59.99 
   1280x854      59.95 
   1280x800      59.96 
   1280x720      59.97 
   1152x768      59.95 
   1024x768      59.95 
   800x600       59.96 
   848x480       59.94 
   720x480       59.94 


And the output of applicable output of lspci -v is

Code: Select all
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV710/M92 [Mobility Radeon HD 4530/4570/545v] (prog-if 00 [VGA controller])
   Subsystem: Dell Mobility Radeon HD 4570
   Flags: bus master, fast devsel, latency 0, IRQ 25
   Memory at d0000000 (32-bit, prefetchable) [size=256M]
   I/O ports at 2000 [size=256]
   Memory at fc000000 (32-bit, non-prefetchable) [size=64K]
   [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
   Capabilities: <access denied>
   Kernel driver in use: radeon
   Kernel modules: radeon
awesome0possum
 
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Re: Second Monitor Detected but no Display

Postby 4D696B65 » 2020-05-15 01:27

awesome0possum wrote:and it came on rather randomly while I was across the room

Bad cable?

Your GPU needs firmware-amd-graphics. Is it installed?

https://packages.debian.org/buster/firmware-amd-graphics
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Re: Second Monitor Detected but no Display

Postby awesome0possum » 2020-05-15 11:24

I tried every VGA cable I have in the house (3) and none worked. I switched the monitor to an HDMI monitor and it works fine, so it may be the monitor itself that is the issue. I'll do so additional troubleshooting on it later
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Re: Second Monitor Detected but no Display

Postby djk44883 » 2020-05-25 13:19

I may have similar struggles. I don't have a fix, just some notes - "Dell Mobility Radeon" This is a laptop? It has an Intel processor, with onboard (discrete) graphics?

You just show lspci for the radeon, so I don't know if you do or don't have to video "cards". Just because you want to use the Radeon doesn't mean the system is using the Radeon instead on the Intel HD graphics. But your Dell system may be different, or you've already figured how to select it. /var/log/Xorg.0.log may provide some insight
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