i915: kernel errors at resume

i915: kernel errors at resume

[Paul Bolle]

0) On a laptop I use I've ran into i915 kernel errors at resume. I see
these only every now and then: not on all resumes. The pattern of these
errors (and preceding messages) is basically always like this:

<6>[14673.762529] [drm] Changing LVDS panel from (+hsync, +vsync) to (-hsync, -vsync)
<6>[14673.824599] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
<3>[14673.825071] render error detected, EIR: 0x00000010
<3>[14673.825071] page table error
<3>[14673.825071]   PGTBL_ER: 0x00000100
<3>[14673.825071] [drm:i915_report_and_clear_eir] *ERROR* EIR stuck: 0x00000010, masking

1) I've only noticed this because:
- I tend to check for KERN_ERR messages in the logs; and
- the errors (ie, the messages with a <3> prefix) look scary when text
mode briefly flashes by at suspend and at resume.
Otherwise the display on this machine seems to work just fine.

2) The logs on this machine only have information for v3.3 based
kernels. I haven't checked whether earlier kernels also do this. Nor
have I checked whether this is fixed in the current v3.4 release
candidates.

3) Some similar reports, but for messages printed at boot:
http://lists.freedesktop.org/archives/dri-devel/2011-January/007302.html
http://lists.freedesktop.org/archives/dri-devel/2012-January/018158.html

4) What can I do to (help) make these messages go away?


Paul Bolle

Re: i915: kernel errors at resume

[Paul Bolle]

On Thu, 2012-04-19 at 11:04 +0200, Paul Bolle wrote:
> <6>[14673.824599] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state

I triggered this issue once again in the session I run currently:
    $ cat /sys/kernel/debug/dri/0/i915_error_state | wc -c
    689681

What part of that almost 700K file could be of interest?


Paul Bolle

Re: i915: kernel errors at resume

[Daniel Vetter]

On Sat, Apr 21, 2012 at 02:25:55PM +0200, Paul Bolle wrote:
> On Thu, 2012-04-19 at 11:04 +0200, Paul Bolle wrote:
> > <6>[14673.824599] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
> 
> I triggered this issue once again in the session I run currently:
>     $ cat /sys/kernel/debug/dri/0/i915_error_state | wc -c
>     689681
> 
> What part of that almost 700K file could be of interest?

All of it. Please file a bug report with the error state attach (the
entire thing), complete dmesg showing when the problem happens and a short
description of the issue at bugs.freedesktop.org against DRI, component
DRM/Intel.

Thanks, daniel
-- 
Daniel Vetter
Mail: daniel@ffwll.ch
Mobile: +41 (0)79 365 57 48

Re: i915: kernel errors at resume

[Paul Bolle]

On Sat, 2012-04-21 at 14:54 +0200, Daniel Vetter wrote:
> On Sat, Apr 21, 2012 at 02:25:55PM +0200, Paul Bolle wrote:
> > What part of that almost 700K file could be of interest?
> 
> All of it. Please file a bug report with the error state attach (the
> entire thing), complete dmesg showing when the problem happens and a short
> description of the issue at bugs.freedesktop.org against DRI, component
> DRM/Intel.

OK, I'll do that then. Would you know whether bugs.freedesktop.org
requires me to compress files of that size?


Paul Bollw

Re: i915: kernel errors at resume

[Daniel Vetter]

On Sat, Apr 21, 2012 at 02:58:39PM +0200, Paul Bolle wrote:
> On Sat, 2012-04-21 at 14:54 +0200, Daniel Vetter wrote:
> > On Sat, Apr 21, 2012 at 02:25:55PM +0200, Paul Bolle wrote:
> > > What part of that almost 700K file could be of interest?
> > 
> > All of it. Please file a bug report with the error state attach (the
> > entire thing), complete dmesg showing when the problem happens and a short
> > description of the issue at bugs.freedesktop.org against DRI, component
> > DRM/Intel.
> 
> OK, I'll do that then. Would you know whether bugs.freedesktop.org
> requires me to compress files of that size?

Please don't if possible, it's a hassle to first unzip it. And usually it
works without issues.
-Daniel
-- 
Daniel Vetter
Mail: daniel@ffwll.ch
Mobile: +41 (0)79 365 57 48

Re: i915: kernel errors at resume

[Paul Bolle]

On Sat, 2012-04-21 at 14:54 +0200, Daniel Vetter wrote:
> Please file a bug report with the error state attach (the
> entire thing), complete dmesg showing when the problem happens and a short
> description of the issue at bugs.freedesktop.org against DRI, component
> DRM/Intel.

See https://bugs.freedesktop.org/show_bug.cgi?id=49041 for that report.


Paul Bolle