Description of problem:
An external monitor connected via the HDMI port is not detected under System Settings->Displays->Detect Displays.
This seems to be similar to Bug 691429, but in my case a HDMI output is not even listed in the xrandr output:
$ xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
LVDS1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
1920x1080 60.0*+ 40.0
800x600 60.3 56.2
VGA1 disconnected (normal left inverted right x axis y axis)
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Connect external monitor to HDMI port
2. Go to System Settings->Displays
3. Click Detect Displays
External monitor is not detected.
External monitor should be detected and used.
Dell Latitude E6520
Intel® Core™ i7-2720QM CPU @ 2.20GHz × 8
Intel® Sandybridge Mobile
The monitor has been used successfully with another laptop.
Booting with nomodeset did not help (but rather made things worse).
Turning off Optimus mode in the bios didn't help (but rather made things worse).
$ lsmod |egrep 'nou|i915'
i915 378728 2
nouveau 545642 0
ttm 55273 1 nouveau
drm_kms_helper 26474 2 i915,nouveau
drm 193923 5 i915,nouveau,ttm,drm_kms_helper
i2c_algo_bit 4974 2 i915,nouveau
i2c_core 25712 7 i2c_i801,videodev,i915,nouveau,drm_kms_helper,drm,i2c_algo_bit
mxm_wmi 1727 1 nouveau
video 12340 2 i915,nouveau
$ lspci -v |grep VGA
00:02.0 VGA compatible controller: Intel Corporation Device 0126 (rev 09) (prog-if 00 [VGA controller])
01:00.0 VGA compatible controller: nVidia Corporation Device 1056 (rev a1) (prog-if 00 [VGA controller])
FWIW, in case there is any chance that this is related/relevant: there have also been (ACPI?) problems with this laptop, e.g. it can't reboot (it just hangs at the final point where normally it should reboot).
Created attachment 522230 [details]
Created attachment 522231 [details]
Relevant excerpt from /var/log/messages
Sorry, that's how Optimus works. The non-LVDS digital outputs are only connected to the nvidia chip.
It's also worth noting your NVIDIA GPU is GF119, which while the graphics part of the chip is still a Fermi (current generation codename), NVIDIA redesigned quite a lot of other areas (including the display). This chipset was not supported in F15 (I don't think it was even around when F15 was released).
F16 and up support your chipset, and if you're willing to setup an xorg.conf with multiple X screens (ie. you won't be able to move windows between them) you should get some functionality out of your external monitor.
This should probably be marked as duplicate of Bug 691429.
FWIW, I worked around it by just using analog VGA instead of HDMI for the external monitor.
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