No DRI3 on AMD capable card

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No DRI3 on AMD capable card

Postby algarues » 2018-03-31 12:37

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

Code: Select all
Section "Device"
    Identifier  "Radeon"
    Driver      "modesetting"
    Option      "AccelMethod"    "glamor"
    Option      "DRI"            "3"

if I run a glxinfo command I get the following:
Code: Select all
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
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Re: No DRI3 on AMD capable card

Postby Head_on_a_Stick » 2018-03-31 13:03

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: ... deo-radeon ... deo-amdgpu

And indeed Phoronix report very good performance: ... -wow&num=1
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Re: No DRI3 on AMD capable card

Postby Wheelerof4te » 2018-03-31 13:07

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.
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Re: No DRI3 on AMD capable card

Postby algarues » 2018-04-02 21:20

Thank you!
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