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Hi, I am a linux newbie. I have installed Ubuntu 11.04 on my Dell XPS laptop and I am trying to connect to an external display via the DisplayPort output. It worked for one day, and then stopped working. I think there were some updates that I allowed to install that may have caused the problem, but I am not sure. I understand from some other posts that the displayport output comes from an integrated intel graphics controller. If it matters, i am using an i5 processor. Any ideas?
By the way, when my second display stopped working, I noticed that my primary display (the laptop display) occasionally flashes / blinks.
Last edited by firstname.lastname@example.org; 08-22-2011 at 12:50 PM.
Reason: Added more info.
This could be driver related. Are you sure you have intel based graphics? If you have an amd(ati) or nvidia based card, try the proprietary drivers. My XPS uses a NVIDIA based card and so have all the others I have seen...
I've heard of issues with the Intel 82852/855GM graphics card which require some untrusted repos for correct graphic functionality.
A little more information about your system would be helpful.
I am 99% sure that the graphics is Intel. I have a Dell XPS, which has two video outputs, HDMI and mini-DP. The HDMI is nVidia, and I found a link saying that nVidia optimus (what-ever that is) is not supported via ubuntu, and that users should use the DP output. I have included a lspci below. Is there any other information that I can provide?
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation 2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB Controller: Intel Corporation 6 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series Chipset Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.1 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 2 (rev b5)
00:1c.3 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 4 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 5 (rev b5)
00:1c.5 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 6 (rev b5)
00:1d.0 USB Controller: Intel Corporation 6 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation HM67 Express Chipset Family LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series Chipset Family 6 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series Chipset Family SMBus Controller (rev 05)
01:00.0 VGA compatible controller: nVidia Corporation Device 0df5 (rev a1)
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6230 (rev 34)
04:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
I can drag a window off the screen again like a second monitor is there, and I have not done anything except take the garbage out! When this happens, the colors on my terminal get inverted and turn opaque.
I looked into this a bit and from what I have gathered it seems you will have to deal with the Nvidia card. You are correct about HDMI being directly connected to the Nvidia gpu, and the intel (IGPU) having the VGA and DP connected to it. The only problem is that while HDMI only comes from the Nvidia gpu, all other video can come from either the Nvidia or the IGPU.