On 05/21/2015 11:17 PM, Ken Moffat wrote: > On Thu, May 21, 2015 at 07:06:01PM +0100, Ken Moffat wrote: >> On Thu, May 21, 2015 at 07:42:49PM +0200, Armin K. wrote: >>> >>> Chris narrowed down the issue in using xf86-video-intel with kernel-4.0. >>> Problem is in the SNA code. Switching to UXA seems to fix the problem. >>> I am using UXA for a long time now and didn't notice any problems with >>> either kernel-4.0 or gcc-5. >>> >> Thanks, I'll give that a try later this evening. >> > > For me, with (sysvinit) BLFS-7.7 I had no issues, and sna is the > default - that system was compiled against 3.19.0 but was running > 4.0.3. It looks as if --enable-uxa was used when I configured it. > > On the new build, I've now rebuilt the intel driver with > --enable-uxa but I had to add a conf file to force it to use uxa > instead of sna, otherwise it still segfaulted. >
That's because SNA is default accel method in 2.99 series. One reason for the version bump to 3.0. Some Xorg devs who work on Intel driver besides the DDX developer claim to use UXA because SNA was too complex (almost as big as the 3D driver) and I followed their footsteps since every new 2.99.91x release something breaks and I have to resort building from git or patching the released driver with at least one patch that got merged after the release. > ken@jtm1 ~ $cat /etc/X11/xorg.conf.d/20-intel.conf > Section "Device" > Identifier "Intel Graphics" > Driver "intel" > Option "AccelMethod" "uxa" > EndSection > > I got that from Arch - normally I put conf files in > /usr/share/xorg.conf.d with X in /usr, but I thought I would try > /etc/X11/xorg.conf.d. > I disabled SNA at compile time, it caused me too much trouble for too little gain. > No idea what changed - any pointers to Chris's post(s) ? > It was on irc. > At the moment, the intel driver is now working, but SNA > (Sandybridge's New Acceleration) segfaults - and I had been using > SNA for ages because this i3 _is_ a SandyBridge. > > ĸen > -- Note: My last name is not Krejzi.
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