Re: [RFC/PATCH xf86-video-intel] sna: Let modestting + glamor handle gen9+

[Timo Aaltonen <tjaalton@ubuntu.com>]

29.02.2016, 16:47, Hans de Goede kirjoitti:
> sna has no meaningfull accel for gen9+, this causes problems with i.e.
> apps using XVideo since the sprite XVideo support does not work well
> for many apps.
> 
> Therefor it is better to just let the xserver fall back to modesetting +
> glamor. This is implemented by returning FALSE from the probe methods,
> just like how nouveau handles falling back to modesetting for newer cards.
> 
> BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1305369
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

I've been trying to make this work, but there are cases where it fails bad:

# a config file with a Device section that loads 'intel' makes the
server fail
[    10.153] (EE) No devices detected.
[    10.153] (EE)
Fatal server error:
[    10.153] (EE) no screens found(EE)

ie. no fallback in that case

# with X run as root (wrapper or not), same thing different cause
[   145.943] (EE) modeset(0): drmSetMaster failed: Invalid argument
[   145.943] (EE)
Fatal server error:
[   145.943] (EE) AddScreen/ScreenInit failed for driver 0


but it does work with startx run by a user. Tests done on Debian with
1.18.1 and intel ddx git.

-- 
t
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