On Thu, Oct 4, 2012 at 12:34 PM, <mika.kuopp...@intel.com> wrote: > From: Mika Kuoppala <mika.kuopp...@intel.com> > > Add description for drm_kms_helper.poll module parameter introduced > by commit: e58f637bb96d5a0ae0919b9998b891d1ba7e47c9 > > Signed-off-by: Mika Kuoppala <mika.kuopp...@intel.com>
Actually I've noticed even with just hdmi it stalls for long enough to miss a frame, on an otherwise idle system. Kernel testcases ftw, kms locking ftl :( Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch> > --- > Documentation/kernel-parameters.txt | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/Documentation/kernel-parameters.txt > b/Documentation/kernel-parameters.txt > index f777fa9..ad97749 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -741,6 +741,17 @@ bytes respectively. Such letter suffixes can also be > entirely omitted. > if its name and a colon are prepended to the EDID > name. > > + drm_kms_helper.poll= > + Polling for connected VGA devices on older systems > + can be quite expensive, causing latencies of > + several hundred milliseconds. This will cause visible > + stalls, for example in video playback. If you > + experience stalls in display output occurring every > + 10 seconds (DRM_OUTPUT_POLL_PERIOD=(10*HZ)), disabling > + polling might help. > + Format: <bool> (1/Y/y=enable, 0/N/n=disable) > + default: enabled > + > dscc4.setup= [NET] > > dyndbg[="val"] [KNL,DYNAMIC_DEBUG] > -- > 1.7.9.5 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/dri-devel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel
