2

The problem

I've got two graphics cards in my computer:

  • Nvidia GTX 580
  • Intel Graphics (onboard)

The Nvidia part is working fine: plugged in a DVI cable to my monitor and everything works perfectly. The Intel part is totally ignored. xrandr says it is disconnected, and even tty is not visible at the Intel/HDMI display.

When having xf86-video-intel installed, my monitor says no signal, if it is uninstalled, it says 1024-768 connected with a black screen. (completely black, no tty)

Information

I am using Arch Linux.

After installing xf86-video-intel I also added to /etc/mkinitcpio.conf the i915 tag in the MODULES line: MODULES="i915"

Calling uname -r gives me: 3.14.25-1-lts

Calling lscpi -v gives me (among other things):

00:02.0 Display controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
Subsystem: ASRock Incorporation Device 0122
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at f7400000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at f000 [size=64]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Kernel modules: i915

Calling xrandr gives me:

Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192
DVI-I-1 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
   1920x1200     59.95*+
   1600x1200     60.00  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1024x768      75.08    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    60.00  
   720x400       70.08  
DVI-I-2 disconnected (normal left inverted right x axis y axis)
HDMI-4 disconnected (normal left inverted right x axis y axis)

Possible causes which are not the cause

  • The cable is not the problem. It runs perfectly fine booting on Windows.

3 Answers 3

2

I'm no expert, but as far as I know, on board graphics are always disabled when you add a video card. I run three monitors, and I've set up dual monitors on several machines, but I have never once got the onboard video to work at all once addon cards are inserted. I'd love to be mistaken about that.

2
  • Thank you for your response. I've always got a dedicated graphics card, but prefer to run the onboard one (at Linux). This somehow seemed to work so far. The only problem is when combining them ... Feb 1, 2015 at 12:23
  • Well, if you ever get an onboard to work in combination with a card, please let me know, I never have, the card always kills the onboard. I read somewhere that this is hard coded onto motherboards or in BIOS or something, and can't be cured, but I'd love to be wrong. Feb 1, 2015 at 15:49
2

The BIOS is responsible for deciding whether or not the IGD is enabled when a graphics card is present. However, nvidia and Catalyst may not allow "rebuffering" of the graphics card output into the IGD buffer even when the IGD is enabled.

1
  • Source: I'm running radeon for my graphics card and have Intel graphics enabled as well, with a monitor attached to each. Dec 4, 2017 at 1:36
0

I have a integrated Intel GPU. The HDMI monitor is connected through a mini DP port to HDMI output (some reduction), the docking station should be the final solution, but I don't have one. It doesn't work at start.

My solution was

xrandr --addmode HDMI-1 1920x1080
xrandr --output HDMI-1 --mode 1920x1080

and it works.

It's necessary to do everything through xrandr directly, because the GUI doesn't see the monitor, xrandr too, but its possible to set it direct.

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