No DRI3 on AMD capable card

[algarues]

I cannot get DRI3 to be enabled on a Radeon 4550 HD (RV710) on Stretch.

The card should be capable of it.
I installed the firmware-amd-graphics package and I am using the radeon module for Xorg.

I am using the following 20-modesetting.conf file

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Section "Device"
    Identifier  "Radeon"
    Driver      "modesetting"
    Option      "AccelMethod"    "glamor"
    Option      "DRI"            "3"
EndSection

if I run a glxinfo command I get the following:

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Vendor: X.Org (0x1002)
    Device: AMD RV710 (DRM 2.49.0 / 4.9.0-6-amd64, LLVM 3.9.1) (0x9555)
    Version: 13.0.6
    Accelerated: yes
    Video memory: 512MB

What could be missing?
Thanks for any help

[Head_on_a_Stick]

Try using the radeon driver rather than Xorg's builtin modesetting DDX:

Code: Select all

    Driver      "radeon"

I think DRI3 should be enabled by default with that.

I know Debian recommend modesetting for Intel cards but that's because xf86-video-intel is so buggy, they have no such recommendation on the AMD driver pages:

https://packages.debian.org/stretch/xse ... deo-radeon

https://packages.debian.org/stretch/xse ... deo-amdgpu

And indeed Phoronix report very good performance:

https://www.phoronix.com/scan.php?page= ... -wow&num=1

[Wheelerof4te]

To build on H.o.a.S's suggestion, the performance of radeon driver is heavily related to the kernel version. While Stretch's kernel will be sufficient for normal usage, further boosts will come only on newer kernels.

[algarues]

Thank you!