[gentoo-user] Need some help with switching KDE setup from i915 to radeon graphics

[Frank Steinmetzger]

Hello Fellows,

My PC had been running on Intel graphics for 1½ years. Finally, I got myself
an AMD R7 370 today and installed it (together with a second set of 16 Gigs
of RAM ^^).

I could use some help getting it working properly. Here is what I did:
yesterday I enabled VIDEO_CARDS=radeon in make.conf and rebuilt world with
--changed-use. I also reconfigured the kernel to build the Intel driver as
a module and to include the radeon module.

After installing the card, at first I only had a black screen and found out
(thanks to #gentoo) that I needed a firmware blob. Once that was installed,
I had a KMS-enabled VT on my AMD-connected monitor. Yay.

Now I'm stuck with a malfunctioning X (or more specifically, KDE, as it
seems). I can run AwesomeWM just fine. But when I try to start KDE, I see
the first of those fading-in progress icons and then the screen goes black.

I created a test account to have a clean setup of KDE. This starts KDE
partially, only up to a desktop with an empty panel. There is no mouse
cursor to move around and no reaction to shortcuts such as Alt+F2.

What else could I have missed in my migration from Intel to AMD? eselect
opengl only shows the xorg-x11 option. I had to comment out a modeline which
I set manually in xorg.conf.

See attached:
- /etc/X11/xorg.conf.d/gfx.conf
- /var/log/Xorg.0.log from running startx with .xinitrc containing startkde.
  You can see those three blocks of modelines at the end. At around or just
  before this point the screen goes dark.

Can anyone give me a nudge. Or maybe I should as in a KDE list.

-- 
Gruß | Greetings | Qapla’
Please do not share anything from, with or about me on any social network.

Faithfulness is a lack of opportunity.