[PATCH xserver] modesetting: Fix page flipping under DRI 3.2.

[Mario Kleiner]

Hi again,

with the fresh x-server patch i just sent out, the EGL + DRI3 problems
under KDE are gone, at least as tested on an old Intel Ironlake and
GeForce Tesla.

I still see some more problems beyond those, which may or may not be
related to the new DRI3.1/3.2 stuff. On KDE-5 the KDE panel
occasionally freezes/becomes unresponsive, while the remaining desktop
continues to work. This seems to be something recent and only on
modesetting-ddx.

On intel-ddx + Ironlake i get modesetting failure at server startup,
but only under DRI3, and not with modesetting-ddx. The kernel drm-next
kernel seems to complain about unsupported tiling formats for the fb.
On NVidia Pascal i also saw modesetting failure, but not on older
Tesla gpu's.
This needs more testing.

-mario


On Fri, Apr 6, 2018 at 11:44 AM, Daniel Stone <daniel at fooishbar.org> wrote:
> Hi,
>
> On 6 April 2018 at 09:48, Mike Lothian <mike at fireburn.co.uk> wrote:
>> Thanks for reminding me about GLX vs EGL
>>
>> The config option in KDE was removed from the System Setting app and can
>> only be adjusted manually in in ~/.config/kwinrc
>>
>> GLPlatformInterface=egl
>>
>> This might explain why Daniel hasn't been seeing the issues I've been seeing
>
> I tried this on both i915 (Skylake) and amdgpu, both of which work fine. :(
>
> KWin does seem to be extremely verbose: can you please capture the
> console output from it?
>
> Cheers,
> Daniel