On Fri, Oct 30, 2009 at 11:37 AM, Jesse Barnes <jbar...@virtuousgeek.org> wrote: > On Fri, 30 Oct 2009 02:25:21 -0400 > Andrew Lutomirski <l...@mit.edu> wrote: > >> On Thu, Oct 29, 2009 at 1:40 PM, Andrew Lutomirski <l...@mit.edu> >> wrote: >> > >> > I just suspended and resumed and power consumption stayed low. I'll >> > try and get an intel_reg_dumper diff next time I trigger this bug. >> >> intel_reg_dumper blames RENCLK_GATE_D2. Patch coming. >> >> Maybe my BIOS doesn't always reset it. > > Does resetting that reg get your power savings back?
Surprisingly, no. With my kernel patched to restore it on resume, I still see high power consumption, and rebinding still fixes it. (As an aside, I think hat i915's ability to survive rebinding without crashing on the next X startup has gotten worse recently. I invariably OOPS awhile after rebinding with recent kernels.) I diffed the output of intel_reg_dumper (2.9.0, I think): --- /tmp/pre-rebind 2009-10-30 14:35:24.267236469 -0400 +++ /tmp/post-rebind 2009-10-30 14:39:22.649986477 -0400 @@ -46,7 +46,7 @@ (II): PFIT_CONTROL: 0x00000000 (II): PFIT_PGM_RATIOS: 0x00000000 (II): PORT_HOTPLUG_EN: 0x3e040320 -(II): PORT_HOTPLUG_STAT: 0x38560800 +(II): PORT_HOTPLUG_STAT: 0x38000000 (II): DSPACNTR: 0x00000000 (disabled, pipe A) (II): DSPASTRIDE: 0x00000000 (0 bytes) (II): DSPAPOS: 0x00000000 (0, 0) @@ -149,7 +149,7 @@ (II): FBC_COMMAND: 0x08c80034 (II): FBC_STATUS: 0x00000000 (II): FBC_CONTROL2: 0x00000000 -(II): FBC_FENCE_OFF: 0x00008000 +(II): FBC_FENCE_OFF: 0x10000000 (II): FBC_MOD_NUM: 0x00000060 (II): MI_MODE: 0x00000200 (II): MI_ARB_STATE: 0x00000040 intel_reg_write doesn't seem to work right on FBC_FENCE_OFF (previous value doesn't agree w/ intel_reg_dumper), and I'm not sure exactly what that's supposed to do. --Andy ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
