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Message-ID: <CA+55aFz-z72adma1F=b8WL2XZ9=F9mWdt1XC7QGH0-Wc3tYunA@mail.gmail.com> Date: Thu, 23 Feb 2012 12:36:30 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Chris Wilson <chris@...is-wilson.co.uk> Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, Eugeni Dodonov <eugeni.dodonov@...el.com>, Dave Airlie <airlied@...hat.com>, Alex Deucher <alexdeucher@...il.com> Subject: Re: [PATCH] drm: Reduce the number of retries whilst reading EDIDs On Thu, Feb 23, 2012 at 12:15 PM, Linus Torvalds <torvalds@...ux-foundation.org> wrote: > > Sadly, this doesn't seem to make any difference to my case. My xrandr > stays at 0.555s even with this patch. Btw, profiling with call chains seems to say that it all comes from intel_sdvo_get_analog_edid() (about half from intel_sdvo_get_modes() and half from intel_sdvo_tmds_sink_detect()). All called through drm_ioctl() -> drm_mode_getconnector() -> drm_helper_probe_single_connector_modes(). Which I guess isn't anything interesting, but that intel_sdvo_get_analog_edid() thing seems to be very much a Mac mini hack. There's a comment about that in the sources too: /* * Mac mini hack. On this device, the DVI-I connector shares one DDC * link between analog and digital outputs. So, if the regular SDVO * DDC fails, check to see if the analog output is disconnected, in * which case we'll look there for the digital DDC data. */ and maybe that mac mini hack ends up interacting badly with something else? I'll happily test patches if people have any ideas. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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