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glamor / xf86-video-modesetting
So, xf86-video-intel has issues on old GMA cards with SNA.
xf86-video-modesetting doesn't share those issues, but requires glamor
to be performant.
I thought I'd have another look, this time with a radeon HD5450.
adding this /etc/xorg.conf:
Identifier "Configured Video Device"
Surprisingly, glamor is already attempted out of the box
(II) modeset(0): glamor X acceleration enabled on AMD CEDAR (DRM 2.43.0 / 10.0.59, LLVM 9.0.0)
Unfortunately it has very violent display issues (text in terminal looks
wrong, glxgears doesn't display anything).
Looking at the warnings,
(WW) modeset(0): DRI2: glamor lacks support for pixmap import/export
Apparently this is a warning that occurs when dri3 is not enabled.
So I'm taking back my hints to others that we should work on
xf86-video-modesetting for a while. Will have to DRM update first.
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