[Intel-gfx] PCH fifo underrun in 3.18

[Jani Nikula]

On Wed, 11 Feb 2015, jon <jmoroney at hawaii.edu> wrote:
> Under what product should I submit the bug? dmr.debug=14 doesn't show much.

The link I provided has those filled in. Product DRI, component
DRM/Intel.

Jani.

>
> [jon at localhost]~% dmesg | grep drm
> [    1.936241] [drm] Initialized drm 1.1.0 20060810
> [    2.193043] [drm] Memory usable by graphics device = 2048M
> [    2.193046] [drm] Replacing VGA console driver
> [    2.199998] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> [    2.200000] [drm] Driver supports precise vblank timestamp query.
> [    2.287949] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to 
> bit banging on pin 5
> [    2.297614] fbcon: inteldrmfb (fb0) is primary device
> [    2.576664] [drm:cpt_set_fifo_underrun_reporting] *ERROR* uncleared 
> pch fifo underrun on pch transcoder A
> [    2.576666] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO 
> underrun
>
>
> Jon
>
> On 02/08/2015 11:18 PM, Jani Nikula wrote:
>> On Fri, 30 Jan 2015, jon <jmoroney at hawaii.edu> wrote:
>>> Just updated my thinkpad (x230, ivy bridge platform) to 3.18 and boot
>>> fails with the error 'PCH fifo underrun'. This is under fedora 21 with
>>> the fedora kernel version 3.18.3-201
>> Please file a bug on [1], attach a dmesg from boot to the problem with
>> drm.debug=14 module parameter set. Reference this thread.
>>
>> Thanks,
>> Jani.
>>
>> [1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel
>>
>
> -- 
> Jon
>

-- 
Jani Nikula, Intel Open Source Technology Center