This seems to be specific to the i965 (or ixxx?) mesa driver. I put a
PCI R128 AIW card into the machine (to use as a second head). After
finding and reporting some bugs with two X screens, I set X to use the
r128 as its only screen.
Now glxgears and glxinfo read ~/.drirc, and look for /etc/drirc.
Configuring the swap interval actually has an effect: setting it to 1
makes glxgears -printfps go at 70FPS, the monitor refresh rate. 0 gives
265FPS. (The g965 hardware does more like 1220FPS :)
It's the last thing it does before it starts doing 3D:
...
open("/usr/lib/x86_64-linux-gnu/libtxc_dxtn.so", O_RDONLY) = -1 ENOENT (No such
file or directory)
munmap(0x2b06e7270000, 70806) = 0
open("/etc/drirc", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/home/peter/.drirc", O_RDONLY) = 5
read(5, "<driconf>\n <device screen=\"0\""..., 4096) = 290
read(5, "", 4096) = 0
close(5) = 0
mmap(NULL, 1417216, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x
2b06e7270000
brk(0x593000) = 0x593000
brk(0x5bd000) = 0x5bd000
...
then pretty soon the string of ioctl()s...
--
~/.drirc is not read
https://launchpad.net/bugs/75702
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