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Old 08-22-2011, 11:14 AM   #1
aaleclaire@gmail.com
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Dell XPS laptop, Ubuntu 11.04, DisplayPort output, cannot detect display


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.

thanks!
Aaron

Last edited by aaleclaire@gmail.com; 08-22-2011 at 11:50 AM. Reason: Added more info.
 
Old 08-22-2011, 02:01 PM   #2
bentbrewer
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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.
 
Old 08-22-2011, 02:13 PM   #3
aaleclaire@gmail.com
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Thank you for the quick reply.

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?

Thanks!
Aaron

aaron@aale:~$ lspci
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)
 
Old 08-22-2011, 02:14 PM   #4
szboardstretcher
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What is the model number of the XPS?

have you tried the kernel argument:

Quote:
i915.modeset=1
It works on my Studio XPS 1640

Last edited by szboardstretcher; 08-22-2011 at 02:20 PM.
 
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Old 08-22-2011, 02:24 PM   #5
aaleclaire@gmail.com
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Hi,

My model number is XPS L502X.

I have not tried the kernel argument: i915.modeset=1
How do I do that ?

Thanks!
Aaron
 
Old 08-22-2011, 02:26 PM   #6
bentbrewer
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Nivida Optimus is like a hybrid Intel/Nvidia which allows some pretty nice power saving functionality, I have heard about it but haven't seen it in action. There is apparently some work being done to incorporate this functionality into Ubuntu (among other linux flavors) here - https://github.com/MrMEEE/bumblebee. There is a ppa - https://launchpad.net/~mj-casalogic/+archive/bumblebee/.

Wish I could offer more help - try searching for "ubuntu bumblebee". You could always try and turn off the intel graphics and just use the nvidia gpu but you would lose the power saving functionality.
 
Old 08-22-2011, 02:33 PM   #7
bentbrewer
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There is some more information available here - https://github.com/MrMEEE/bumblebee/issues/80

Close to the end of the page is a post with directions spelled out on how to get Optimus working properly on your Dell XPS L502X.
 
Old 08-22-2011, 02:43 PM   #8
aaleclaire@gmail.com
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Thanks! I would be happy without optimus and just my Intel graphics. Do I need optimus to work if I just want to use the Intel graphics. I just need a second display (2D only).
 
Old 08-22-2011, 03:30 PM   #9
bentbrewer
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It didn't seem too tough to get optimus working. As far as just having intel:

From https://wiki.edubuntu.org/HardwareSu...ps/Dell/XPS/15 - this is for edbuntu but should work:

Switch off NVIDIA card

# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

Switch on NVIDIA card

# echo ON > /sys/kernel/debug/vgaswitcheroo/switch

Using the following command before and after the switch, you should see a drop/rise in mW being used:

# grep rate /proc/acpi/battery/BAT0/state

You can also completely disable the NVIDIA card and only use the Intel onboard graphics card ( which has more than enough performance for day-to-day work:

# echo "blacklist nouveau" > /etc/modprobe.d/blacklist-nvidia.conf
# update-initramfs -c -k all
# reboot
 
Old 08-22-2011, 09:33 PM   #10
aaleclaire@gmail.com
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The output from the Intel DP output still not working. I **think** the nVidia optimus thing is a non-issue if I am using DisplayPort, or is it???
 
Old 08-22-2011, 09:36 PM   #11
aaleclaire@gmail.com
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Hmmmm, I just noticed that I can drag a window completely off the screen, like the other display is there. However, there is no signal to the second display. Interesting...
 
Old 08-22-2011, 09:54 PM   #12
aaleclaire@gmail.com
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I tried setting i915.modeset=1 in etc/default/grub and run update-grub, but my second display is still not working. Sad face...
 
Old 08-22-2011, 09:56 PM   #13
aaleclaire@gmail.com
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Interesting, I rebooted and now I can not drag a window off the screen (as if the second display were there) anymore... And after this reboot, my screen blinks about once every minute.
 
Old 08-22-2011, 10:29 PM   #14
aaleclaire@gmail.com
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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.
 
Old 08-23-2011, 12:10 AM   #15
bentbrewer
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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.

bb
 
  


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