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re: kern/51339 (No drmkms available for Radeon R7 250)

The following reply was made to PR kern/51339; it has been noted by GNATS.

From: matthew green <>
Subject: re: kern/51339 (No drmkms available for Radeon R7 250)
Date: Tue, 30 Aug 2016 10:58:09 +1000

 FWIW, the ati driver disables all acceleration on GCN rev1 chipsets
 and the R7 250 is one of these.
 i do have X sort of working with an R7 240 which seems very similar
 to the 250, except slower and fewer shader + texture cores, but there
 is no acceleration.  this is with native xorg-server 1.18 and amd64.
 from xf86-video-ati's src/radeon_kms.c:
     833     if (info->ChipFamily >=3D CHIP_FAMILY_TAHITI) {
     834         goto shadowfb;
     819 shadowfb:
     820         info->r600_shadow_fb =3D TRUE;
    1627     info->directRenderingEnabled =3D FALSE;
    1628     if (info->r600_shadow_fb =3D=3D FALSE)
    1629         info->directRenderingEnabled =3D radeon_dri2_screen_init(p=
 and from radeon_probe.h:
     110     CHIP_FAMILY_TAHITI,
     112     CHIP_FAMILY_VERDE,
     113     CHIP_FAMILY_OLAND,
 (both the 240 and 250 are OLAND generation.)
 i don't know why it has to use shadowfb or why this means no DRI,
 but that's what i see in the code of xf86-video-ati 7.7.0.

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