Since Phoronix is the best source of news on Linux graphics hardware (and probably Linux hardware and benchmarking, too), I decided to e-mail the site's Michael Larabel and see what he thought about the fact that there has never been an RPM-packaged AMD Catalyst driver for Fedora 20, and at the moment even the upstream AMD installer won't work with the 3.14.x Linux kernel.

I'd like to thank Michael for turning that e-mail into this article: AMD Catalyst On Fedora 20 Is Left In An Awkward State.

The next day, he followed it up with How-To Install AMD Catalyst 14.4 On Fedora 20 With Linux 3.14.

I'd like to thank Michael for this, and for all the day-to-day reporting he does on Linux (and often BSD) in regard to drivers and hardware.

In a forum post for the last article, I found a different, better way to get AMD Catalyst/fglrx working in Fedora 20.

Ironically (or perhaps coincidentally), this tip comes from the guy who orphaned the Catalyst packages in RPM Fusion for Fedora 20 but still maintains them for Fedora 19 (and it involves using the F19 packages in F20).

I have to do a few more tests of this method before I detail it in another post, but first I'd like thank Michael again for his posts, and Leigh Scott right now for this too-easy way of getting the Catalyst driver working again.

Final word: I don't blame Leigh, per se, for dropping the Catalyst package in RPM Fusion. It's every maintainer's right to quit whenever they want. I'm just continually stunned and saddened that in the many months since Leigh made this decision, nobody else has stepped in to fill this crucial gap in the Fedora/RPM Fusion/Catalyst world.

I'm only speculating as to what caused 3D acceleration to stop working on my Fedora 20 system using the upstream-installed AMD Catalyst driver.

But I'm pretty sure it is the new Mesa packages that rolled into Fedora a day or so ago.

Even if Mesa isn't the culprit, apps that require 3D hardware acceleration are either throwing warnings about the lack of this particular feature, or just crashing immediately.

Running glxinfo in a terminal gave me the following message:

direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose)

I suspected that the AMD Catalyst video driver, which I'm installing with AMD own .run installer because there is no Fedora 20 package for it in RPM Fusion, was somehow broken.

When I have problems with the proprietary video driver, I usually uninstall Catalyst, check whatever's broken while running the open Radeon driver and then reinstall Catalyst and check again.

Except this time Catalyst wouldn't uninstall. The error message I received said something about the configuration being changed.

Catalyst wouldn't reinstall, either.

The script output suggested that using --force would overcome the errors in either case -- uninstalling or reinstalling.

So I decided to reinstall AMD Catalyst over the current installation.

Since I was already running the latest Catalyst driver from AMD, I had previously downloaded, unzipped it and installed it, and the .run file was already on my system for the reinstall.

I did this as root:

# ./amd-driver-installer-14.10-x86.x86_64.run --force

Catalyst reinstalled with no trouble, I rebooted, and 3D hardware acceleration was back.