linux-kernel - Re: [3.5 regression] DRM: Massive (EDID-probing?) X startup delay on ATI Radeon RV770 (HD4870)

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Date:	Mon, 6 Aug 2012 09:42:03 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Nix <nix@...eri.org.uk>
Cc:	linux-kernel@...r.kernel.org, Jerome Glisse <j.glisse@...il.com>,
	alex.deucher@...il.com
Subject: Re: [3.5 regression] DRM: Massive (EDID-probing?) X startup delay on
 ATI Radeon RV770 (HD4870)

On Sat, Aug 4, 2012 at 12:13 PM, Nix <nix@...eri.org.uk> wrote:
> Possibly-relevant info:
>
>  - Two DVI monitors, identical specs, one dual-head graphics card
>    (so no VGA switcheroo or awesome-yet-terrifying PRIME madness needed)
>
>  - KMS, Xserver 1.12.3, driver 6.14.6-28 (trunk current as of today),
>    Mesa 8.0.4, libdrm 2.4.37
>
> As of kernel 3.5 EDID probing of the older of my two monitors appears to
> have subtly broken. The log shows that it appears to work -- KMS comes
> up OK and I get a working console -- but then X stops during startup for
> nearly a minute (with both monitors black) before coming back to life
> again and EDID-probing the monitor a further six times for no obvious
> reason. (Full log attached, and xorg.conf, for what little use it is.)
>
> Something appears to be wrong, but I have no idea what. I've not changed
> anything other than the kernel since my last non-huge-delayed startup
> earlier this week, and both the monitors still work, including the one
> suffering a huge startup delay.

Can you bisect the kernel or profile Xorg and see what's causing it?
There haven't been any i2c changes in the radeon kernel driver in a
while.  I'm assuming it's only the kernel that you changed?  E.g.,
just to be sure, does booting a different kernel with the same
userspace components work correctly?

Alex
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