I have a Sapphire X550XTX (01:00.0 0300: 1002:5657) to use this card I have to edit shared-core/drm_pciids.txt adding 0x1002 0x5657 CHIP_RV380|RADEON_NEW_MEMMAP "ATI Radeon RV370 X550XTX" and compile drm. This pciid should inserted in radeon driver too (I have to force it using ChipId 0x5b63 in xorg.conf).
Pushed to drm (0744cb153aabd290fd4832288a530adeb5561e2c), mesa (80efe27560134510dce88a52729e5a3d93e8e275, a107ec8300c6df3dc6ee636ccfd469c820b00190), radeon (0c26806245381b925b73ff9f3b747e3dcf0ebd6f).
Actually, the "X550XTX" is an rv410 based card (i.e. a rebranded X700) and not an rv370. See http://ati.amd.com/developer/ATI_Device_IDs.txt
fixed. thanks! drm: 207f701e1affa18b0d54e09f7bf8b6447cb16258 mesa: dc25661099bcc4b107a30ca504fcc2e76db3492e ddx: aea9bf75cf0774afd3e65fcf3fd3851f5fb21ca3 Although from the perspective of the driver, there's not much difference.
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