I spoke too soon with this. I can't get it to work properly with a hand-crafted xorg.conf file. As Gnome seems to automatically detect all the monitors OK, can anyone recommend a window manager I can use with CentOS 7 that will allow me to start independent full-screen kiosk browser sessions from a script, specifying which monitor to use each time? On Wed, Sep 19, 2018 at 12:14 PM Richard G <grainger at gmail.com> wrote: > > Cracked this. The solution was that I needed to specify the correct > driver ("radeon") in the xorg conf file to use the open source driver, > e.g. > > Section "Device" > Identifier "aticonfig-Device-0" > Driver "radeon" > BusID "PCI:1:0:0" > EndSection > > All the other bits from the conf file I could keep the same as before. > On Wed, Sep 19, 2018 at 10:41 AM Richard G <grainger at gmail.com> wrote: > > > > I have an unusual use case. I wonder if anyone can help. We use a PC > > with 8 HDMI outputs for powering a video wall in an operations centre. > > We use two Matrox video cards, each with 4 outputs. "lspci" reports > > these cards as" [AMD/ATI] Cape Verde PRO [FirePro W600]". > > > > On an older version of CentOS 7, I used the proprietary AMD/ATI > > driver. This had a utility (I roorget the name) that generated a > > working xorg.conf file. I could them throw up the > > "matchbox-window-manager" on each monitor in turn using > > "DISPLAY=:0.0", "DISPLAY=:0.1" etc and then throw up a full-screen > > chrome web browser in kiosk mode on each monitor after that. This all > > worked great. > > > > In a recent version of CentOS 7, this all broke. The proprietary > > driver no longer works. The good news is that the open source driver > > seems to work fine with multi-monitor in Gnome for example. > > > > My only issue is that I don't want to use Gnome across multiple > > monitors. I want to use matchbox-window-manager or similar, and > > specify individual X screen (":0.0", ":0.1" etc). How do I generate > > an xorg.conf file with the new open source drivers? Am I doing this > > all wrong? > > > > Thanks!