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Hey everybody,
I hope I used the correct forum for this, but I got the feeling it might me a hardware issue.
The idea I had here was to connect an external monitor to my laptop via HDMI, in order to get some sort of "extended desktop".
It's a Dell Inspiron Laptop with hybrid AMD / Intel GPUs, proprietary AMD driver and the AMD GPU active:
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
Subsystem: Dell Device 05b8
Kernel driver in use: i915
--
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars [Radeon HD 8730M]
Subsystem: Dell Device 05b8
Kernel driver in use: fglrx_pci
xrandr gives the following output:
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
1366x768 60.04*+ 40.02
1360x768 59.80 59.96
1024x768 60.00
800x600 60.32 56.25
640x480 59.94
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected (normal left inverted right x axis y axis)
1920x1080 60.00 + 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 59.98
1280x1024 75.02 60.02
1280x800 59.91
1152x864 75.00
1280x720 60.00 50.00 59.94
1440x576i 50.00
1024x768 75.08 60.00
1440x480i 60.00 59.94
832x624 74.55
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DP1 disconnected (normal left inverted right x axis y axis)
So the monitor connected to the HDMI port seems to work too.
However the monitor doesn't seem to get any signal ("no cable connected!").
Any idea where to start here?
Thanks in advance
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^Basically, you haven't instructed your computer to start to actually use HDMI monitor.
Start the 'arandr' program (it is by default installed on stock BL), and make HDMI output active, select resolution, and select 'Layout|Apply'. This should activate the HDMI monitor.
Last edited by iMBeCil (2018-11-29 17:35:54)
Postpone all your duties; if you die, you won't have to do them ..
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Thanks for your reply.
I forgot to mention: I actually played around with arandr and tested a bit (since xrandr seems to recognize the external monitor, I figured it's just a matter of defining what each one has to do), so both the HDMI and LVDS monitors are active and "ready to use" in arandr.
Still the HDMI monitor doesn't get any signal. Nothing happens over there, black screen.
To rule out obvious things: The external monitor works (tested a couple of days ago on another computer).
I can bet it has something to do with the hybrid GPU hardware and / or the graphics driver, but I don't really know what the problem could be here... as soon as it gets to graphics issues on linux systems - I am totally lost.
Last edited by fdg2018 (2018-11-29 18:37:04)
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^Hm ... from your xrandr output, I can see following:
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
This means your laptop screen is physically connected (kind of obvious) and configured to show desktop.
HDMI1 connected (normal left inverted right x axis y axis)
This means that the HDMI cable/output is connected to something (monitor), but graphics card is not (yet) configured to show desktop on the monitor.
Perhaps, you should run xrandr directly, from the command line:
$ xrandr --output HDMI1 --auto
or more specific:
$ xrandr --output HDMI1 --mode 1920x1080 --right-of LVDS1
(see 'man xrandr'). Perhaps it will spill some error?
Postpone all your duties; if you die, you won't have to do them ..
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With hybrid NVIDIA/Intel graphics I recently learned there's a xorg.conf setting prohibiting any external display use:
Option "UseDisplayDevice" "None"
Commenting this out in xorg.conf helped - maybe it's a trace for your AMD/Intel thingy?
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^ Although the default BL doesn't use xorg.conf
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Yes, other distributions don't do that as well but the common solution for hybrid graphics is to switch PCI IDs in custom xorg.conf files.
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Thanks for your replies so far... unfortunately I didn't have time yet to do some more testing, will get back to you...
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