Am 20.12.2011 22:50, schrieb Alex Deucher: [...]
>> [drm:radeon_pm_print_states], 4 Power State(s) >> [drm:radeon_pm_print_states], State 0: Default >> [drm:radeon_pm_print_states], Default >> [drm:radeon_pm_print_states], 16 PCIE Lanes >> [drm:radeon_pm_print_states], 3 Clock Mode(s) >> [drm:radeon_pm_print_states], 0 e: 800000 m: 1250000 v: >> 1060 No display only >> [drm:radeon_pm_print_states], 1 e: 800000 m: 1250000 v: >> 1060 >> [drm:radeon_pm_print_states], 2 e: 800000 m: 1250000 v: >> 1060 > > This first state is the default/boot state. > >> [drm:radeon_pm_print_states], State 1: Performance >> [drm:radeon_pm_print_states], 16 PCIE Lanes >> [drm:radeon_pm_print_states], 3 Clock Mode(s) >> [drm:radeon_pm_print_states], 0 e: 250000 m: 150000 v: >> 900 No display only >> [drm:radeon_pm_print_states], 1 e: 500000 m: 1250000 v: >> 1000 >> [drm:radeon_pm_print_states], 2 e: 800000 m: 1250000 v: >> 1060 > > This is the single head performance state. > >> [drm:radeon_pm_print_states], State 2: Default >> [drm:radeon_pm_print_states], 16 PCIE Lanes >> [drm:radeon_pm_print_states], 3 Clock Mode(s) >> [drm:radeon_pm_print_states], 0 e: 500000 m: 1250000 v: >> 1000 No display only >> [drm:radeon_pm_print_states], 1 e: 500000 m: 1250000 v: >> 1000 >> [drm:radeon_pm_print_states], 2 e: 725000 m: 1250000 v: >> 1060 >> [drm:radeon_pm_print_states], State 3: Default >> [drm:radeon_pm_print_states], 16 PCIE Lanes >> [drm:radeon_pm_print_states], 3 Clock Mode(s) >> [drm:radeon_pm_print_states], 0 e: 500000 m: 1250000 v: >> 1000 No display only >> [drm:radeon_pm_print_states], 1 e: 500000 m: 1250000 v: >> 1000 >> [drm:radeon_pm_print_states], 2 e: 725000 m: 1250000 v: >> 1060 > > These last two are most likely special video playback states. > >> [drm] radeon: power management initialized >> [drm] fb mappable at 0xC0142000 >> [drm] vram apper at 0xC0000000 >> [drm] size 8294400 >> [drm] fb depth is 24 >> [drm] pitch is 7680 >> fbcon: radeondrmfb (fb0) is primary device >> [drm:radeon_set_power_state], Setting: e: 80000 >> [drm:radeon_set_power_state], Setting: m: 125000 >> Console: switching to colour frame buffer device 240x67 >> fb0: radeondrmfb frame buffer device >> drm: registered panic notifier >> [drm] Initialized radeon 2.12.0 20080528 for 0000:01:00.0 on minor 0 >> >> There are three Default and one Performance State. How can they be related >> to the /sys profile entry? Further, how are the ones for multi-display >> configuration chosen? > > There's only 1 default state. The code to print out the tables says > "default" by default if there is no other attribute set. Most cards > have two performance states: one for multi-head and one for single > head. Since there is no multi-head power state, the driver uses the > default profile for multi-head. IIRC, the ATI fglrx driver seems to use the same strategy as r600. Needless to say that I'm not very fond of this strategy. I didn't check what state the windows driver chooses, but I would be surprised if it does something different. > On systems like this it might be better to use the last profile for > multi-head. Ok, for now I changed radeon_pm.c to always use the single-head profile for low and mid. However, selecting the last profile as you suggested would not help in my case, as it is the same as single-profile mid and causes the fan to spin up to definitely audible levels. I did not notice any performance difference between low and mid for usual desktop work with desktop fx enabled. The card seems to be able to handle two monitors in single-head low power profile just fine. This might change when you connect more than two monitors. >> BTW: I guess there is a typo somewhere in the drm debug code? Evidently, the >> last 0 is missing here: >> [drm:radeon_set_power_state], Setting: e: 80000 >> [drm:radeon_set_power_state], Setting: m: 125000 > > The driver stores clocks in 10 khz units. Thanks for clarification. Harald -- `Experience is the best teacher.'
