Hi - I am new here and would appreciate any ideas anyone might have.
I have a Dell Optiplex 790 and have installed a GeForce 8400GS card. I installed the Ubuntu base from the mini.iso file and added the LXDE-core desktop environment. When I boot-up with the VGA cable connected to it, the monitor acts like nothing is connected (screen is black, light is blinking). If I move the cable to the integrated card, I can see the desktop on the monitor.
After I first installed the OS, the card worked with Nouveau, but everything was extremely slow to respond, like I had only 256mb of ram installed (there are 8GB installed. with over 7gb free). I concluded something was amiss with the drivers. Here are the steps I have taken to resolve, but haven’t been able to fix it:
Blacklisted the Nouveau driver (which was what originally showed when I did
sudo lshw -c display
. Now it shows Nvidia.)
Opened TTY and did:
sudo apt-get purge nvidia*
sudo service lightdm stop
sudo add-apt-repository ppa:graphics-drivers
sudo apt-get update
sudo apt-get install nvidia-340
I then rebooted and went to Additional drivers and made sure the 340 card was selected. I rebooted. It didn't work. I then opened Nvidia Server Settings and installed Prime. It showed Nvidia as the selected card. I then did Prime-Select query and it showed Nvidia.
I think that is all the steps I have done so far. It appears that the system sees the cards, sees the driver, is thinking the Nvidia card is the one I am using (which may explain why things are a bit hinky with the Intel card), but I can’t get the system to actually use the Nvidia card. I am sure I am missing something basic and important…I just can’t figure it out.
Also, I tried connecting the DVI cable. The monitor was recognized, but didn’t wake-up until the start-up process got to the desktop. No splash screen or anything else. Also, when I look at Monitor Settings, it only shows the DVI monitor, even after plugging in the VGA cable as well. In addition, when opening a program (like Firefox), it is unrolling the window, rather than just appearing, if that makes sense.
I have been using Ubuntu for a few years, but am by no means an expert. I am grateful for any ideas.
nvidia-bug-report.log.gz (61.7 KB)