Description of problem: There are small black dots in the screen when scrolling large pages in firefox when the sna driver is enabled. Version-Release number of selected component (if applicable): 20 How reproducible: Very Steps to Reproduce: 1. Enable sna 2. Open large page in firefox (preferable one which is updated) 3. Scroll fast Actual results: Black dots appear in the screen Expected results: No black dots Additional info:
Forgot to ask, but this bug has been fixed upstream, so can the driver be updates in fedora 20?
I believe the problem is that, by default, Fedora uses the UXA acceleration method: $ grep -i uxa -A5 /var/log/Xorg.0.log.old [ 7332.214] (II) UXA(0): Driver registered support for the following operations: [ 7332.214] (II) solid [ 7332.214] (II) copy [ 7332.214] (II) composite (RENDER acceleration) [ 7332.214] (II) put_image [ 7332.214] (II) get_image After adding SNA as an acceleration method in /etc/X11/xorg.conf.d/20-intel.conf: Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "sna" EndSection the problem seems to have dissappeared. I'll test a bit more and let you know if the problem reappears (I have an Ivy Bridge CPU with Intel HD 4000 integrated GPU): $ grep -i sna -A5 /var/log/Xorg.0.log [ 21801.588] (**) intel(0): Option "AccelMethod" "sna" [ 21801.588] (--) intel(0): Integrated Graphics Chipset: Intel(R) HD Graphics 4000 [ 21801.588] (--) intel(0): CPU: x86-64, sse2, sse3, ssse3, sse4.1, sse4.2, avx [ 21801.588] (**) intel(0): Framebuffer tiled [ 21801.588] (**) intel(0): Pixmaps tiled [ 21801.588] (**) intel(0): "Tear free" disabled -- [ 21801.590] (II) intel(0): SNA initialized with Ivybridge (gen7, gt2) backend
Oh, sorry, now I see... for you the problem starts when you enable SNA. For me it seems to stop with SNA. Hmmm!
New versions of the Intel driver use sna by default. Fedora really should move to using sna (which outperforms UXA by orders of magnitude) and update to a recent release of intel driver. This has been fixed upstream - including the use of sna.
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