Date: Fri, 18 May 2012 01:03:43 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: user10508@gmail.com Cc: freebsd-x11@freebsd.org Subject: Re: pcbsd9-stable-20120505 snapshot - howto enable intel rc6 Message-ID: <20120517220343.GY2358@deviant.kiev.zoral.com.ua> In-Reply-To: <4FB503A6.8000506@gmail.com> References: <4FB503A6.8000506@gmail.com>
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--rd/3IrB17klb+Ksj Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, May 17, 2012 at 09:56:54AM -0400, user10508@gmail.com wrote: > I'm using this pcbsd snapshot on an asus k53e laptop >=20 > /etc/make.conf contains: > WITH_NEW_XORG=3Dyes >=20 > xf86-video-intel-2.17.0 compiled from ports >=20 > Laptop runs very hot > Battery lasts less than half as long as pcbcd9 release intel driver >=20 > sysctl inquiry reveals >=20 > hw.dri.0.info.i915_drpc_info: RC information accurate: yes > Video Turbo Mode: yes > HW control enabled: yes > SW control enabled: no > RC1e Enabled: no > RC6 Enabled: no > Deep RC6 Enabled: no > Deepest RC6 Enabled: no > Current RC state: on > Core Power Down: no >=20 >=20 > If it is possible to enable RC6: >=20 > what modes can be enabled >=20 > how can/should an RC6 mode be enabled On my 2600K enabling any RC6 causes reliable failure to start BLT ring. When I tried to enable RC for wider audience, I get similar reports in quantity. So RC6 is disabled by default. I have no idea what version of Intel GPU patch was applied to your snapshot, so I describe a recipe for 14.x and 15.x series of patches. To try to play with RC6, you need to set kernel environment variables before loading the i915(kms) module. Set drm.i915.intel_iommu_enabled=3D0, then you may enable actual RC6 states with drm.i915.enable_rc6 tunable. The bits are the same as for Linux, citation from i915_drv.h: /** * RC6 is a special power stage which allows the GPU to enter an very * low-voltage mode when idle, using down to 0V while at this stage. This * stage is entered automatically when the GPU is idle when RC6 support is * enabled, and as soon as new workload arises GPU wakes up automatically a= s well. * * There are different RC6 modes available in Intel GPU, which differentiate * among each other with the latency required to enter and leave RC6 and * voltage consumed by the GPU in different states. * * The combination of the following flags define which states GPU is allowed * to enter, while RC6 is the normal RC6 state, RC6p is the deep RC6, and * RC6pp is deepest RC6. Their support by hardware varies according to the * GPU, BIOS, chipset and platform. RC6 is usually the safest one and the o= ne * which brings the most power savings; deeper states save more power, but * require higher latency to switch to and wake up. */ #define INTEL_RC6_ENABLE (1<<0) #define INTEL_RC6p_ENABLE (1<<1) #define INTEL_RC6pp_ENABLE (1<<2) --rd/3IrB17klb+Ksj Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk+1db4ACgkQC3+MBN1Mb4hBAgCgwfXflTPYO0bR8tTb7DVKga3k thYAn2lilRXhhPdfV6xVLZd7tWKKBPYm =KS23 -----END PGP SIGNATURE----- --rd/3IrB17klb+Ksj--
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