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Message-ID: <20120813034922.24517.qmail@science.horizon.com> Date: 12 Aug 2012 23:49:22 -0400 From: "George Spelvin" <linux@...izon.com> To: ben@...dawsk.net Cc: dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org, linux@...izon.com, linux-kernel@...r.kernel.org Subject: Re: v3.5 Oops in i2c_algo_bit.c:bit_xfer+0x23/0x870: i915 or i2c? (Bringing this back to the mailing lists after a bit of uninteresting private conversation.) > Honestly, I think we need a way to force disable gmbus with a module > parameter or something anyway. It's not the first time gmbus has been > implicated with an issue. Maybe it even exists already, but I couldn't > find this. So if you confirm that fixes the problem for you on the ml, > at least maybe such a patch will be the result. > > If you feel it's a software bug (which I agree it seems likely), a > bisect is always much appreciated. Personally, I'll usually step back > major releases until something works, or I hit 3.2ish. Even knowing it > never worked through 3.2 is helpful. It's a friend's machine, which I normally only have remote access to, so it's a bit pf a pain, but I can manage. I just thought a basic i3 motherboard was so common I couldn't possibly be the only one with this problem. Here's the 3.2 dmesg showing the fallback working, but this is an Ubuntu-patched kernel (linux-image-3.2.0-29-generic) that may be a fair distance from stock: [ 44.401124] [drm] Initialized drm 1.1.0 20060810 [ 44.471549] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 44.471553] i915 0000:00:02.0: setting latency timer to 64 [ 44.555865] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus disabled] [ 44.611882] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus disabled] [ 44.667876] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus disabled] [ 44.723831] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus disabled] [ 44.779841] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus disabled] [ 44.835854] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus disabled] [ 44.895843] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus disabled] [ 44.951836] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus disabled] [ 45.007798] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus ssc] [ 45.063716] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus ssc] [ 45.119776] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus ssc] [ 45.175716] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus ssc] [ 45.231689] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus ssc] [ 45.287696] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus ssc] [ 45.343704] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus ssc] [ 45.399667] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus ssc] [ 45.455651] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus vga] [ 45.511629] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus vga] [ 45.567581] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus vga] [ 45.623645] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus vga] [ 45.679546] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus vga] [ 45.735614] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus vga] [ 45.791596] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus vga] [ 45.847533] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus vga] [ 45.903517] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus panel] [ 45.959547] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus panel] [ 46.015492] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus panel] [ 46.071473] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus panel] [ 46.127430] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus panel] [ 46.183447] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus panel] [ 46.239425] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus panel] [ 46.295407] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus panel] [ 46.351401] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpc] [ 46.407382] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpc] [ 46.463363] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpc] [ 46.519347] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpc] [ 46.575302] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpc] [ 46.631320] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpc] [ 46.687360] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpc] [ 46.743300] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpc] [ 46.799250] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpb] [ 46.855292] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpb] [ 46.911250] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpb] [ 46.967250] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpb] [ 47.023258] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpb] [ 47.079206] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpb] [ 47.135232] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpb] [ 47.191163] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpb] [ 47.247148] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus reserved] [ 47.303186] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus reserved] [ 47.359091] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus reserved] [ 47.415157] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus reserved] [ 47.471062] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus reserved] [ 47.527121] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus reserved] [ 47.583087] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus reserved] [ 47.639092] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus reserved] [ 47.695081] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpd] [ 47.751011] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpd] [ 47.810995] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpd] [ 47.867014] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpd] [ 47.923009] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpd] [ 47.978921] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpd] [ 48.034954] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpd] [ 48.090936] [drm] GMBUS timed out, falling back to bit banging on pin 0 [i915 gmbus dpd] [ 48.091142] i915 0000:00:02.0: irq 49 for MSI/MSI-X [ 48.091147] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). [ 48.091148] [drm] Driver supports precise vblank timestamp query. [ 48.091182] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem [ 48.511902] fbcon: inteldrmfb (fb0) is primary device [ 48.852752] Console: switching to colour frame buffer device 240x67 [ 48.857087] fb0: inteldrmfb frame buffer device [ 48.857088] drm: registered panic notifier [ 48.857205] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0 -- 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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