Here is my situation - I am running Ubuntu 12.04 LTS 32 bit on an IBM T60 laptop (for interested parties: Intel Core 2 Duo T7600 2.33 GHz, 4 GB RAM) and currently have it docked in the Lenovo 2503 Advanced Dock. I do this to run two monitors (the dock has 1 DVI and 1 VGA out). The dock has a PCI-E port to add a second video card so up to 4 monitors can be used. After a little digging, I found that IBM says to use the Lenovo branded ATI X1300 256 MB card, so I went on eBay and bought a brand new card for $15. I installed it, and the third monitor did nothing.
I have been trying to figure this out now for a couple of days. I am using the open source radeon drivers. I had tried to use the ATI drivers but that got me nowhere. When I run lspci | grep VGA, here is what I get:
jdepalma@jdepalma-ThinkPad-T60:~$ lspci | grep VGA 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV515/M54 [Mobility Radeon X1400] 0c:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516 [Radeon X1300/X1550 Series]
Mobility X14oo is the GPU on my motherboard and the X1300 is the Lenovo card I put in the Advanced Dock. What does the 0c:00.0 mean? This is weird since the PCI card is detected but when I went to the system settings there was nothing recognized (monitor or card).
I tried to install the ATI proprietary drivers and that made my laptop a wee bit unstable. The radeon open source driver supports both cards AFAIK. I'd like to be able to run a third monitor using the X1300 if possible. Anyone have suggestions? Thanks in advance.