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installing X with radeon driver lead to llvmpiped slow X


onli
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I have a Radeon 7950. I think my question is whether it is a known bug, just something I did wrong or something I should report elsewhere?

 

Following the installation doc in the wiki, I added radeon as VIDEO_CARD to my make.conf. When later installing X, I had to add glamor. When X then started it claimed to have DRI, but did not use the radeon driver but rather the mesa llvmpipe solution, which is as far as I udnerstand only cpu powered? In any case, it was unbearably slow. I then stumbled upon http://forums.funtoo.org/topic/850-cant-start-x-as-a-regular-user/ because If ound the same debug output when starting X:

gbm: failed to open any driver (search paths /usr/lib64/dri)
gbm: Last dlopen error: /usr/lib64/dri/radeonsi_dri.so: cannot open shared object file: No such file or directory
failed to load driver: radeonsi
EGL_MESA_drm_image required.

Note that the xorg.0.log did not contain that error.

 

The solution was to add radeonsi to VIDEO_CARD and to let emerge rebuild with --newuse.

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I don't think so. It states the contrary in https://wiki.gentoo.org/wiki/Radeon#Driver:

Portage uses the VIDEO_CARDS variable for enabling support for various graphics cards. Setting VIDEO_CARDS to the value of radeon (see the feature matrix) will pull in the correct driver:

FILE /etc/portage/make.conf

VIDEO_CARDS="radeon"

 

radeonsi gets only mentioned in the feature matrix, where for the older cards it is stuff like r600 that would get included automatically, wouldn't it?
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Hey, I was able to fix it by changing VIDEO_CARDS="radeon" to VIDEO_CARDS="radeonsi". I found the solution on a Gentoo forum:

https://forums.gentoo.org/viewtopic-p-7534494.html

 

The instructions that I followed:

"Make sure you have VIDEO_CARDS="radeonsi" and then `emerge -N media-libs/mesa` again; to be save `emerge -N @world` might also be a good idea to rebuild other libraries that use VIDEO_CARDS too."

 

and after it recompiled x server, llvm, and etc, it worked :D and I can play Steam games, and my DE is accelerated.

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Hey, thanks. Good to know that radeonsi alone should work as well. I now edited the wiki. I'm not actually sure how open they are to outsiders editing it, and I can only hope the problem is not Funtoo-specific, but I hope it is correct and helps some people.

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