Olaf Ruppert wrote:
> On Mon, Apr 20, 2009 at 4:41 PM, Olaf Ruppert
>>> I believe they turn off interrupts on vblank to save power.
>
> O.K. I checked that. I get the vblank interrupt.
> But it does not help, here is the code:
>
> static void swap(void)
> {
> static char * device = "/dev/dri/card0";
> static int fd = 0;
> drm_wait_vblank_t blank;
> int r = -1;
>
> if (!fd) {
> fd = open(device, O_RDWR);
> if (fd < 0)
> die ("dri: Could not open device");
> }
>
> blank.request.type = _DRM_VBLANK_RELATIVE;
> blank.request.sequence = 1;
>
> do {
> r = ioctl(fd, DRM_IOCTL_WAIT_VBLANK, &blank);
> blank.request.type &= ~_DRM_VBLANK_RELATIVE;
> } while (r && errno == EINTR);
>
> if (r)
> die("vsync failed");
>
> glXSwapBuffers(dpy,stage);
> }
You could try adding the DRM_VBLANK_SECONDARY flag to the request.type
I had two systems (both laptops) where one needed this flag, the other
didn't. BTW I used the API in <xf86drm.h> but I don't suspect that makes
a difference.
I looked up what I did to the driver. Besides the modification you mentioned
(in i830_dri.c right?) I also commented out in I830DRISetVBlankInterrupt()
these lines:
if (!pI830->want_vblank_interrupts)
on = FALSE;
Otherwise I don't know. Maybe one of the Intel guys can give a hint. Having
vblank support (without the need tweak and compile a new driver) on intel
graphics hardware is important to many of us.
Theo
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