On Fri, 2008-11-21 at 13:32 -0800, Keith Packard wrote: > On Fri, 2008-11-21 at 23:14 +0200, Michel Dänzer wrote: > > > No, radeon doesn't (un)install the IRQ handler on VT switch. > > It's not a matter of uninstalling the IRQ handler;
Yes, it is. > the question is whether the hardware frame count gets reset at VT > switch time. The i915 driver uses the hardware frame counter to avoid > receiving interrupts when no application is waiting for one, but that > frame counter is reset to zero when the crtc clock is reprogrammed. Same for radeon, but the DRM_PRE/POST_MODESET ioctls compensate for that. This didn't work for i915 because it uninstalls the IRQ handler on VT switch, which destroyed the vblank information. -- Earthling Michel Dänzer | http://tungstengraphics.com Libre software enthusiast | Debian, X and DRI developer ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
