Radeon driver would not work without the proprietary firmwares from normal Linux kernel. Ubuntu 13.04 worked out-of-the-box, while free distributions like Trisquel automatically fallback to VESA driver. As a result, everything 2D sort of worked but at a very slow pace. Screen resolution could not be correctly detected, limited to 4:3 ratio ones only. 3D acceleration did not work.
lspci -vmmnn
Slot: 05:00.0 Class: VGA compatible controller [0300] Vendor: Advanced Micro Devices [AMD] nee ATI [1002] Device: Turks [FirePro V4900] [6749] SVendor: Advanced Micro Devices [AMD] nee ATI [1002] SDevice: Device [2b06] PhySlot: 1
lspci -nnk
05:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Turks [FirePro V4900] [1002:6749] Subsystem: Advanced Micro Devices [AMD] nee ATI Device [1002:2b06] Kernel modules: radeon
3G cards | 33 |
Acquisition cards | 34 |
Bluetooth | 56 |
Ethernet cards | 170 |
Fingerprint readers | 11 |
Host Controllers | 170 |
Modems | 18 |
Notebooks | 785 |
Printers | 125 |
RAID adapters | 20 |
Scanners | 24 |
SD card readers | 56 |
Sound cards | 140 |
Video cards | 341 |
Webcams | 132 |
Wifi cards | 228 |
TOTAL | 2343 |