Things aren't perfect under 3.0, but very usable. I get flickering for some minutes after returning from DPMS sleep, and changing modes with xrandr (tried that to see if it helped the flicker
) corrupts the screen.

[ 208.761365] [drm] Initialized drm 1.1.0 20060810 [ 208.858346] [drm] radeon defaulting to kernel modesetting. [ 208.858352] [drm] radeon kernel modesetting enabled. [ 208.858423] radeon 0000:00:01.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18 [ 208.858431] radeon 0000:00:01.0: setting latency timer to 64 [ 208.867813] [drm] initializing kernel modesetting (PALM 0x1002:0x9802). [ 208.867907] [drm] register mmio base: 0xFE000000 [ 208.867910] [drm] register mmio size: 262144 [ 208.868214] ATOM BIOS: AMD [ 208.868265] radeon 0000:00:01.0: VRAM: 384M 0x0000000000000000 - 0x0000000017FFFFFF (384M used) [ 208.868271] radeon 0000:00:01.0: GTT: 512M 0x0000000018000000 - 0x0000000037FFFFFF [ 208.868446] [drm] Detected VRAM RAM=384M, BAR=256M [ 208.868453] [drm] RAM width 16bits DDR [ 208.868865] [TTM] Zone kernel: Available graphics memory: 820394 kiB. [ 208.868876] [TTM] Initializing pool allocator. [ 208.868938] [drm] radeon: 384M of VRAM memory ready [ 208.868988] [drm] radeon: 512M of GTT memory ready. [ 208.869047] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). [ 208.869054] [drm] Driver supports precise vblank timestamp query. [ 208.869131] radeon 0000:00:01.0: irq 40 for MSI/MSI-X [ 208.869145] radeon 0000:00:01.0: radeon: using MSI. [ 208.869210] [drm] radeon: irq initialized. [ 208.869220] [drm] GART: num cpu pages 131072, num gpu pages 131072 [ 208.873133] [drm] Loading PALM Microcode [ 208.905519] radeon 0000:00:01.0: WB enabled [ 208.922151] [drm] ring test succeeded in 1 usecs [ 208.922326] [drm] radeon: ib pool ready. [ 208.922445] [drm] ib test succeeded in 0 usecs [ 208.953333] [drm] Radeon Display Connectors [ 208.953339] [drm] Connector 0: [ 208.953342] [drm] HDMI-A [ 208.953345] [drm] HPD2 [ 208.953349] [drm] DDC: 0x6440 0x6440 0x6444 0x6444 0x6448 0x6448 0x644c 0x644c [ 208.953353] [drm] Encoders: [ 208.953356] [drm] DFP1: INTERNAL_UNIPHY [ 208.953359] [drm] Connector 1: [ 208.953362] [drm] VGA [ 208.953366] [drm] DDC: 0x64d8 0x64d8 0x64dc 0x64dc 0x64e0 0x64e0 0x64e4 0x64e4 [ 208.953369] [drm] Encoders: [ 208.953371] [drm] CRT1: INTERNAL_KLDSCP_DAC1 [ 209.009294] [drm] Internal thermal controller without fan control [ 209.009542] [drm] radeon: power management initialized [ 209.090148] [drm] fb mappable at 0xC0141000 [ 209.090152] [drm] vram apper at 0xC0000000 [ 209.090155] [drm] size 14745600 [ 209.090157] [drm] fb depth is 24 [ 209.090160] [drm] pitch is 10240 [ 209.090416] fb0: radeondrmfb frame buffer device [ 209.090419] drm: registered panic notifier [ 209.090429] [drm] Initialized radeon 2.8.0 20080528 for 0000:00:01.0 on minor 0
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