Hi there, everyone, first post in these forums. I've started using CentOS at work and so have only just signed up. I have experience with other distros (mainly Debian-based). I also have experience of having to deal with AMD graphics, as I generally never have had an Nvidia in the past.
I just wanted to say that the instructions given by Nugai on 3rd March did the trick for me. The information might help other people and the developers. Thank you to all. I'm not sure if I am getting my system completely working, but I think this is more of a configuration issue (I hope!).
Desktop workstation, with two Radeon HD 8490 / R5 235X cards installed. I have two Display Port monitors attached; one to each. lspci | grep AMD gives (twice):
[...] [AMD/ATI] Caicos XTX [Radeon HD 8490 / R5 235X OEM]
My Linux installation matches this kernel and CentOS release:
Linux version 3.10.0-514.el7.x86_64
I use Mate desktop.
Late on Friday, I tried to install the AMD driver from the website with their .run file ("AMD-Catalyst-15.9-Linux-installer-15.201.1151-x86.x86_64.run"). When I rebooted, the pre-login desktop appeared, in a bad resolution, for a few seconds, with a spinner, then the screen goes to the text spew, on which it would hang. I could switch to another terminal (Ctrl-Alt-F2) and do stuff, by startx would fail. I tried to then uninstall the driver using yum, which I think was successful, but it didn't put the problem right.
Over the weekend I search the web and found this discussion. As I say, I followed Nugai's steps, although I didn't need to uninstall the old driver.
The only issue now is that only one of the monitors is working. I have two monitors, one plugged into each card. They both worked prior to Friday. Surely this is a configuration issue (aticonfig?). It's not critical, so I'll leave it until later to do.