I have a Caicos card, like this:
[ 3.077260] [drm] radeon kernel modesetting enabled. [ 3.077338] checking generic (e0000000 600000) vs hw (e0000000 10000000) [ 3.077339] fb: switching to radeondrmfb from EFI VGA [ 3.077377] Console: switching to colour dummy device 80x25 [ 3.078881] [drm] initializing kernel modesetting (CAICOS 0x1002:0x6779 0x174B:0xE164). [ 3.078903] [drm] register mmio base: 0xF4A20000 [ 3.078904] [drm] register mmio size: 131072 [ 3.078982] ATOM BIOS: C26401 [ 3.079572] radeon 0000:09:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used) [ 3.079574] radeon 0000:09:00.0: GTT: 1024M 0x0000000040000000 - 0x000000007FFFFFFF [ 3.079576] [drm] Detected VRAM RAM=1024M, BAR=256M [ 3.079577] [drm] RAM width 64bits DDR [ 3.079755] [TTM] Zone kernel: Available graphics memory: 8186568 kiB [ 3.079757] [TTM] Zone dma32: Available graphics memory: 2097152 kiB [ 3.079757] [TTM] Initializing pool allocator [ 3.079773] [TTM] Initializing DMA pool allocator [ 3.080011] [drm] radeon: 1024M of VRAM memory ready [ 3.080012] [drm] radeon: 1024M of GTT memory ready. [ 3.080049] [drm] Loading CAICOS Microcode [ 3.080330] [drm] Internal thermal controller without fan control [ 3.081425] [drm] radeon: power management initialized [ 3.081551] [drm] GART: num cpu pages 262144, num gpu pages 262144 [ 3.082589] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0 [ 3.085030] [drm] PCIE GART of 1024M enabled (table at 0x0000000000274000). [ 3.085221] radeon 0000:09:00.0: WB enabled [ 3.085224] radeon 0000:09:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff88043d914c00 [ 3.085225] radeon 0000:09:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff88043d914c0c [ 3.097438] radeon 0000:09:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc900128b2118 [ 3.097441] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 3.097442] [drm] Driver supports precise vblank timestamp query. [ 3.097514] radeon 0000:09:00.0: irq 56 for MSI/MSI-X [ 3.097544] radeon 0000:09:00.0: radeon: using MSI. [ 3.097614] [drm] radeon: irq initialized.
On recent kernels (3.16 through 3.18-rc4, perhaps), doing anything graphics intensive seems to cause my system to become unusable for tens of seconds. Pointing Firefox at Google Maps is a big offender -- it can take several minutes for me to move my mouse far enough to close the tab and get my computer back.
On bootup, I get this warning: [drm:btc_dpm_set_power_state] *ERROR* rv770_restrict_performance_levels_before_switch failed
Setting radeon.dpm=0 seems to work around this problem at the cost of giving my rather slow graphics.
Are there known issues here?
Thanks, Andy