svn commit: r190401 - head/sys/dev/drm

[N.J. Mann]

In message <200903250150.n2P1ou4g062376 at svn.freebsd.org>,
	Robert Noland (rnoland at FreeBSD.org) wrote:
> Author: rnoland
> Date: Wed Mar 25 01:50:56 2009
> New Revision: 190401
> URL: http://svn.freebsd.org/changeset/base/190401
> 
> Log:
>   Rework the management of vblank interrupts a bit.
>   
>   When a vt switch occurs the irq handler is uninstalled.  Interrupts
>   and the state tracking of what was enabled/disabled wasn't working
>   properly.  This should resolve the reports of "slow windows" after a
>   vt switch, among other things.  The radeon 2d driver seems to work a
>   bit more correctly than the Intel driver.  With the Intel driver,
>   vblank interrupts will be enabled at system startup and will only
>   be disabled after an additional modeset (vt switch, dpms, randr event).
>   
>   With this patch, I am able to run glxgears synced to vblank and
>   vt switch while it is running without ill effects.
>   
>   MFC after:	3 days
> 
> Modified:
>   head/sys/dev/drm/drm_irq.c

Is this a possible cure for the problem I reported here:
http://lists.freebsd.org/pipermail/freebsd-x11/2009-February/007670.html


Cheers,
       Nick.
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