forcing use of vesa driver for x ??
gene.heskett at verizon.net
Fri Oct 9 17:25:08 UTC 2009
I have 2 boxes that run the machine control program 'emc'
One is kubuntu-6.06 LTS and one is ubuntu-8.04 LTS
Because the radeon and the nv drivers both lockup the interrupts for extended
periods of time, the vesa driver which does not do that, is the driver of
choice for this service. All the others play hell with RTAI, messing with
the steadiness of the heartbeat going to the motors which in turn can cause a
stepper motor to stall, and stalled motors usually=wrecked parts.
I just found the 6.06 box has reverted to using the nv driver, which triples
the IRQ latencies to the point of making RTAI useless, and I just traced some
display problems down to the radeon driver on the new 8.04 LTS box that is a
I have found that my carefully crafted xorg.conf file on the 6.06 machine has
been replaced by whatever X now thinks is correct, due to an update I
suppose, but which wrecks how this program works, and which wrecks parts
being carved. I wrecked 3 parts before I discovered this.
I just tried to specify vesa in the device section on the 8.04 install, but
the reboot upchucked and it then appears to have re-written the xorg.conf and
the backups too, with a default that runs a 1920x1250 capable screen (its a
22" samsung tv in fact) and will not run it at anything above 800x600,
grossly fuzzified and totally unusable for the task it must run.
So it is imperative that I restore the use of the vesa driver to both of
How can I restore these two boxes to using the vesa driver, AND prevent X
from overwriting these xorg.conf's to suit itself?
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