On Wed, Aug 03, 2011 at 03:18:22AM -0400, Super Bisquit wrote: > On Wed, Aug 3, 2011 at 1:49 AM, Matthieu Herrb <matthieu.he...@laas.fr>wrote: > > > On Tue, Aug 02, 2011 at 07:00:12PM -0400, Super Bisquit wrote: > > > My apologies before hand. > > > I'm wondering how the OpenBSD PPC port dealt with the mouse > > > grabbing. > > > > Sorry, I don't understand the question. What kind of grabbing are you > > talking about? At the X server level, there is nothing MI in this > > area. > > > > The mouse pointer will get caught on the left edge of the screen and then > only a restart of X allows the pointer to be free again. > And thanks for the reply.
On OpenBSD/macppc, I don't remember having seen that problem, but I may be wrong, and I don't use it on a daily basis anymore. We had it on other architectures though. The main reason for this bug is the SIGIO handler in the Xserver. By default X processes all the data from the mouse driver in the signal handler attached to SIGIO. With the new pointer acceleration code this includes a good amount of floating point computations, and may even trigger some MMX/SSE2 operations in libpixman to repaint the pointer on the screen. If your signal handling code doesn't preserve the FPU (and the altivec) registers, this is likely to trigger the bug. The easiest solution is to disable the code that uses SIGIO to asynchronously update the pointer. pass --disable-use-sigio-by-default to configure for this, or set the option in xorg.conf. > > > > > > > I would like- if possible and with permission- to use the same method > > with > > > FreeBSD PowerPC to solve/prevent the grabbing. > > > Again, my apologies beforehand if this post to the mailing list seems or > > is > > > out of place. -- Matthieu Herrb
