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I have a Dell XPS15 l502x dual-booting Win8 and Ubuntu 12.04.

When I try to connect my second monitor through the HDMI port, the second monitor just says there's no signal.

When I run lspci -v, I get the following:

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Dell Device 04b6
Flags: bus master, fast devsel, latency 0, IRQ 50
Memory at f1400000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915

When I run xrandr, I get:

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 60.1*+ 1360x768 59.8 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)

HDMI1 disconnected (normal left inverted right x axis y axis)

DP1 disconnected (normal left inverted right x axis y axis)

I have no clue how to enable my second monitor. I do have another NVIDIA graphics card:

01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 540M] (rev ff) (prog-if ff) !!! Unknown header type 7f

in my laptop but I don't want to use it since the support for NVIDIA Optimus graphics cards is poor on Linux.

Can anyone suggest a fix for this? Thanks!

naja
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1 Answers1

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I guess the Dell XPS15 l502x has an nvidia optimus chipset. Which has a real poor linux support at the moment. I would suggest that you would use or at least try to use the "discrete graphic only" setting in bios and install the nvidia binary driver. (be careful this impacts your battery life) Although you could try to use the latest nouveau module 1.0.9: http://www.phoronix.com/scan.php?page=news_item&px=MTQyMzk

Please have a look at this question, may it helps you around your problem: How do I get HDMI output working on a Dell XPS 15 L502x?

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