Bug between DRM, MSI, or somewhere, re7-stable amd64
rnoland at FreeBSD.org
Tue Jun 9 13:51:43 UTC 2009
On Mon, 2009-06-08 at 21:52 -0400, Pete Carah wrote:
> I updated my recently acquired core-2 duo laptop to 7-stable amd64 (I
> had been running 7-stable i386 with few problems) and have acquired an
> apparent irq problem.
> Fortunately in debugging a linux shared-interrupt problem about a month
> ago I learned that the X server will happily accept mouse motion as if
> it was a display interrupt, so at least with some inconvenience I can
> read the screen... (the keyboard isn't so obliging)
> Ours does this too...
> /usr/src was picked up via svn on last Saturday morning EDT, ports via
> csup about the same time. I have no idea if this bug is in the intel
> driver, drm, or the core msi code... There are 2 peripherals that dmesg
> says uses msi - re0 (which doesn't get a kernel thread indicated in ps
> for either the stated irq (257) or re0) and drm0/vgapci0 (which
> indicates irq256 in systat and ps). As I said, this worked properly
> with earlier source (about a week) in i386 mode. I've used both G45 and
> re controllers in (f10) linux msi mode with no problems in both 32 and
> 64-bit. Fortunately this laptop now has enough disk to triple-boot so
> at least something works...
Yes, Intel still has issues. I do have a patch that reworks the
interrupt handling and gets Intel chips working. It isn't safe to
commit yet though. It works correctly on my G45, but I have had reports
that GM45 is still broken somehow. As a workaround you can disable MSI
for just drm using loader tuneable hw.drm.msi=0.
> I am using svn instead of csup because I am trying (haven't gotten time
> yet either :-) to port Sam's ath 92xx code to -stable and handling code
> porting is much easier that way.
> -- Pete
> freebsd-stable at freebsd.org mailing list
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Robert Noland <rnoland at FreeBSD.org>
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