[PATCH xserver 3/6] modesetting: add DRI2 page flip support

Michel Dänzer michel at daenzer.net
Fri Aug 19 09:06:54 UTC 2016

On 19/08/16 04:48 PM, Yu, Qiang wrote:
>>>>> +    /* Post damage on the front buffer so that listeners, such
>>>>> +     * as DisplayLink know take a copy and shove it over the USB.
>>>>> +     * also for sw cursors.
>>>>> +     */
>>>> SW cursors cannot work correctly with page flipping. For that reason,
>>>> xf86-video-ati/amdgpu disable page flipping while there's an SW cursor.
>>> [yuq] why? Is the problem in kernel or xserver?
>> The latter, due to the way SW cursor works. There's a fundamental (and
>> likely unfixable) conflict between the SW cursor and page flipping concepts.
> [yuq] So the same problem for modesetting? I see no checking SW cursor
> in original present page flip.

Right, it's currently broken with the modesetting driver.

Note that I'm not saying you need to address that as part of this
series, just that the comment above shouldn't mention SW cursors.

Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

More information about the xorg-devel mailing list