Posts by atcronin

Thanks for the tip.

I created this patch to update the 2 instances of "HDMI_SPD_SDI_PC" in the kernel (fyi: This is my first attempt at this sort of thing)

diff -ruN Source/drivers/gpu/drm/display/drm_hdmi_state_helper.c Updated/drivers/gpu/drm/display/drm_hdmi_state_helper.c
--- Source/drivers/gpu/drm/display/drm_hdmi_state_helper.c	2025-07-28 07:26:38.000000000 +1000
+++ Updated/drivers/gpu/drm/display/drm_hdmi_state_helper.c	2025-08-23 09:31:11.201203540 +1000
@@ -679,7 +679,7 @@
 	if (ret)
 		return ret;
 
-	frame->sdi = HDMI_SPD_SDI_PC;
+	frame->sdi = HDMI_SPD_SDI_DSTB;
 
 	infoframe->set = true;
 
diff -ruN Source/drivers/gpu/drm/i915/display/intel_hdmi.c Updated/drivers/gpu/drm/i915/display/intel_hdmi.c
--- Source/drivers/gpu/drm/i915/display/intel_hdmi.c	2025-07-28 07:26:38.000000000 +1000
+++ Updated/drivers/gpu/drm/i915/display/intel_hdmi.c	2025-08-23 09:31:53.951839965 +1000
@@ -788,7 +788,7 @@
 	if (drm_WARN_ON(encoder->base.dev, ret))
 		return false;
 
-	frame->sdi = HDMI_SPD_SDI_PC;
+	frame->sdi = HDMI_SPD_SDI_UNKNOWN;
 
 	ret = hdmi_spd_infoframe_check(frame);
 	if (drm_WARN_ON(encoder->base.dev, ret))

setting the intel SPD to UNKNOWN and the other to DSTB.

Updated my intel i3-1200 PC with the new build and it worked perfectly.

SPD source reported as 'unknown' and PC mode does not re-engage after shutdown/suspend.

I wonder if this patch (done properly) could make it into the official repo? While it is a workaround for an LG TV bug, I am not sure the possibility of engaging PC mode would ever be preferable for a Kodi distro.

I have this problem on my LG G3 with intel and nvidia gpus.

I reported the issue to LG and got the "forwarded to the relevant team" after providing extremely detailed replication steps.

The G3 didn't do this when I first purchased it in Nov'23, it was a "feature" added later.

the issue affects all devices that report "PC" in their HDMI SPD Info Frame. You can view the SPD info reported to your TV by pressing "1" 5 times on the LG remote while "Programme Tuning" is highlighted in the Settings > General > Programmes menu, then select "More" under the DVI/HDMI Status section.

This issue affects intel 11th and 12th Gen, Nvidia 3050 and 4090 - but not GT1030.

Only AMD GPUs are unaffected. My RX 7600 has a blank/Unknown SPD info frame.