On 11/04/2015 04:48 PM, m.roth at 5-cent.us wrote: > Yep. They got nothing for CentOS 7. Btw, we got him the full width by > changing the cable, from DVI-I to DVI-D (dual link). Then he had to > change it back to not recognizing the full width of the screen via the > control ctr, because when it did, everything was distorted - circles > were ovals, etc. I suppose I'll get around to writing him a xorg.conf > at some time. Mark, with the FirePro V3900 the 'radeon' driver should be loading, not the VESA one. Is xorg-x11-drv-ati installed? I am running a FirePro M7820 in my Dell Precision M6500, and everything 'Just Works' with the xorg-x11-drv-ati package (and its dependencies) installed. I even get triple monitor support at 1920x1200 while docked, using the dual DisplayPort outputs on the dock, on two 24" Dell monitors plus the M6500's 17" display. For using a projector, the DisplayPort connector on the laptop works fine, even hotplug works. I have been very pleased for the most part; there are a few artifacts in Thunderbird, like lines disappear until scrolled, but that might be a Thunderbird issue, and it doesn't happen often. For my FirePro M7820, here's the lspci output: 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Broadway XT [Mobility Radeon HD 5870] 01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Juniper HDMI Audio [Radeon HD 5700 Series] Are you sure you're actually using the VESA drivers? The Turks chip used in the V3900 shows as being supported ('man radeon' will give you a list of supported chips). Check /var/log/Xorg.0.log and see what's going on. Wolfy is working on the latest Catalyst drivers for ELrepo for EL7 (fglrx 15.9 as I recall). There are some challenges, and the kmod-fglrx package is still in testing. But as well as the open radeon driver is supporting my M7820 I'm not sure I want to change at this point. There would have to be some compelling reason.