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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [HSW] no Intel HDMI video output with kernel 4.4 and 4.9"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101302#c16">Comment # 16</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [HSW] no Intel HDMI video output with kernel 4.4 and 4.9"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101302">bug 101302</a>
from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
<pre>(In reply to Jani Nikula from <a href="show_bug.cgi?id=101302#c10">comment #10</a>)
<span class="quote">> + type = DRM_DP_DUAL_MODE_TYPE1_DVI;</span >
That really was a shot in the dark, and shouldn't really have made a
difference... but I guess it works by forcing 165 MHz max clock, and therefore
8 bpc instead of 12 bpc. That's all I can think of. 12 bpc leads to 222.75 MHz
clock which is pretty close to the 225 MHz limit.
So throw the old debug patch away, and try instead:
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
b/drivers/gpu/drm/i915/intel_hdmi.c
index e6f8f30ce7bd..5c99189e9ccf 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1463,7 +1463,9 @@ bool intel_hdmi_compute_config(struct intel_encoder
*encoder,
/* Need to adjust the port link by 1.5x for 12bpc. */
pipe_config->port_clock = clock_12bpc;
- } else {
+ }
+
+ if (true) {
DRM_DEBUG_KMS("picking bpc to 8 for HDMI output\n");
desired_bpp = 8*3;
or alternatively set the "audio" property to "force-dvi" on the connector.
Please attach dmesg on the try.</pre>
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