linux-kernel - Re: [BUG/REGRESSION] DRM / i915 / 2.6.37 and 2.6.38-rc*: DVI output gets disabled/reenabled under load

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Message-Id: <b7da2f$q7ufnf@fmsmga001.fm.intel.com>
Date:	Tue, 25 Jan 2011 13:50:31 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Knut Petersen <Knut_Petersen@...nline.de>
Cc:	jesse.barnes@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [BUG/REGRESSION] DRM / i915 / 2.6.37 and 2.6.38-rc*: DVI output gets disabled/reenabled under load

On Tue, 25 Jan 2011 13:35:31 +0100, Knut Petersen <Knut_Petersen@...nline.de> wrote:
> Attached find the startup logs. Both debuglevel 0xf.

2.6.36:
> [    2.699943] [drm:intel_sdvo_debug_write], SDVOC: W: 02                         (SDVO_CMD_GET_DEVICE_CAPS)
> [    2.736984] [drm:intel_sdvo_debug_response], SDVOC: R: 02 C2 01 01 01 3D 3E 00 (Success)

2.6.38:
> [    2.561275] [drm:intel_sdvo_debug_write], SDVOC: W: 02                         (SDVO_CMD_GET_DEVICE_CAPS)
> [    2.565952] [drm:intel_sdvo_read_response], SDVOC: R: (Success) 02 C2 01 01 01 3D 3E 00
> [    2.579730] [drm:intel_sdvo_get_capabilities], SDVO capabilities:
> [    2.579735]   vendor_id: 2
> [    2.579736]   device_id: 194
> [    2.579737]   device_rev_id: 1
> [    2.579738]   sdvo_version_major: 1
> [    2.579739]   sdvo_version_minor: 1
> [    2.579740]   sdvo_inputs_mask: 1
> [    2.579741]   smooth_scaling: 1
> [    2.579742]   sharp_scaling: 1
> [    2.579743]   up_scaling: 1
> [    2.579744]   down_scaling: 1
> [    2.579745]   stall_support: 0
> [    2.579746]   output_flags: 62

Both report output_flags of 0x3e, which includes VGA and a few
complementary TV out modes. The VGA-2 seems to be ignored by 2.6.36, but
does seem legitimate. Hmm.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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