[Bug 90963] i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Mon Oct 26 02:44:54 PDT 2015
https://bugs.freedesktop.org/show_bug.cgi?id=90963
Ander Conselvan de Oliveira <conselvan2 at gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #119060|0 |1
is obsolete| |
Attachment #119126|0 |1
is obsolete| |
--- Comment #17 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
Created attachment 119195
--> https://bugs.freedesktop.org/attachment.cgi?id=119195&action=edit
Fallback to lower link rate on MST link training failure
(In reply to Eong Chen from comment #15)
> Created attachment 119126 [details]
> full dmesg with <Fallback to lower link rate on MST link training> patch
>
> It shows some crash information. And it doesn't work with my monitor. Sorry
> I didn't read the patch this time. :)
I didn't expect this to fix the problem completely, but to give a clue if the
problem is related to our non-compliant link training implementation.
Unfortunately, there was an error in that patch. Here's a corrected version.
If this produce a line like the following in the log, you can try the patch
below, replacing the number with the one you see in the log, and check if
things work.
[drm:intel_mst_pre_enable_dp] clock recovery succeeded with rate 270000
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c
b/drivers/gpu/drm/i915/intel_dp_mst.c
index eba5bf9..63fe050 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -57,6 +57,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder
*encoder,
lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
rate = intel_dp_max_link_rate(intel_dp);
+ rate = 270000;
if (intel_dp->num_sink_rates) {
intel_dp->link_bw = 0;
--
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