Originally posted by doublez13
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Intel vs. Modesetting X.Org DDX Performance Impact
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Originally posted by doublez13 View PostOk I've got a beginner question here.
I thought that intel's graphics drivers/modules were actually included in the kernel source. So when I install something like xserver-xorg-video-intel, what am I actually installing? are these closed source blobs or something? I didn't think that intel graphics needed anything to be installed. Same with nouveau? What am I missing?
Thanks guys!
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Originally posted by Mystro256 View Post
It's the xorg usermode portion of the driver. This is needed for XOrg (although not for XWayland), which will fall back to XOrg's mode-setting driver with GLAMOR if xserver-xorg-video-intel does not exist.
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Code:LIBGL_DEBUG=verbose glxinfo | grep DRI
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How can I check if I'm using modesetting or Intel driver? I explicitly enabled DRI3 in a conf file, and can see it like this:
Code:LIBGL_DEBUG=verbose glxinfo| grep DRI3 ... libGL: Using DRI3 for screen 0
Code:SNA initialized with Ivybridge (gen7, gt1) backend
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You can check the driver in /var/log/Xorg.0.log
On modesetting, libgl reports:
libGL: pci id for fd 4: 8086:191d, driver i965
libGL: OpenDriver: trying /usr/lib/xorg/modules/dri/tls/i965_dri.so
libGL: OpenDriver: trying /usr/lib/xorg/modules/dri/i965_dri.so
libGL: Using DRI3 for screen 0
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Meh, intel is not just much faster in the 2d tests. it obliterates modesetting. Its like 100-1000x faster...
For OpenGL tests I'm surprised: I run KDE Plasma right now with kwin/qt using OpenGL for UI acceleration: it is noticeably faster with the intel driver vs the modesetting driver, as in, while FPS seems about the same, UI interactions with the intel driver are noticeably lower latency (enough to be absolutely sure it's not placebo, so it's quite a bit faster).
Not sure why that is.
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One more bad thing about modesetting is that it brings ugly diagonal tearing on Haswell. Happens with a non-compositing window manager, happens with Compiz 0.8 (which I have to use because of color management via compicc add-on), doesn't happen with Cinnamon's Muffin.
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