Flickering with page-flipping on Acer Iconia W500 (AMD C-50 APU)

Felix Kuehling felix.kuehling at amd.com
Tue Feb 28 07:06:43 PST 2012

On 12-02-28 09:40 AM, Mario Kleiner wrote:
> Ok, you had a larger test set of machines and more specific test cases
> for this problem, i'm convinced. Thanks for all the testing.
> You have my...
> Reviewed-by: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>

Thanks. Is there anything else I need to do to get this into drm-next?

> Wrt. to that new CRTC_ADVANCED_START_LINE_POSITION register on >=
> DCE4.1 that Alex found. Seems its default setting of 0x4 is the reason
> for the flicker threshold at vpos -4. Maybe it would by worth trying
> for the W500 tablet or devices/modes with similar short vblank
> intervals to reprogram that register with 0? That would give more
> headroom and maybe reduce your 25% number of deferred flips? Or is
> this likely to cause some hw trouble or artifacts because some line
> buffer can't fetch pixel data fast enough?

I'll ask our display team for advice.


> best,
> -mario

 _____    Felix Kuehling
 \ _  |   MTS Software Development Eng.
 /|_| |   SW-Linux Base Gfx | AMD
|__/ \|   T 905.882.2600 x8928

More information about the dri-devel mailing list