[Bug 112018] I7-8700 onboard HDMI port does not support 4K resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112018

--- Comment #1 from jian-hong at endlessm.com ---
Created attachment 145752
  --> https://bugs.freedesktop.org/attachment.cgi?id=145752&action=edit
dmesg with DRM debug

I appended drm.debug=0xe to boot command to enable DRM debug.

[    1.863260] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI
ID: DP-HDMI ADAPTOR\004 (err 0)
[    1.864262] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode
adaptor ID: ff (err 0)
[    1.864287] [drm:intel_hdmi_set_edid [i915]] DP dual mode adaptor (type 1
HDMI) detected (max TMDS clock: 165000 kHz)
[    1.864294] [drm:drm_detect_monitor_audio [drm]] Monitor has basic audio
support
[    1.864297] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:86:HDMI-A-1] status updated from unknown to connected
[    1.864306] [drm:drm_add_display_info [drm]] non_desktop set to 0
[    1.864312] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS
clock 600000 kHz
[    1.864317] [drm:drm_add_display_info [drm]] HF-VSDB: max TMDS clock 600000
kHz
[    1.864332] [drm:drm_add_edid_modes [drm]] ELD monitor ASUS VP28U
[    1.864338] [drm:drm_add_edid_modes [drm]] HDMI: latency present 0 0, video
latency 0 1, audio latency 96 2
[    1.864344] [drm:drm_add_edid_modes [drm]] ELD size 36, SAD count 1
[    1.864349] [drm:drm_add_display_info [drm]] non_desktop set to 0
[    1.864355] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS
clock 600000 kHz
[    1.864361] [drm:drm_add_display_info [drm]] HF-VSDB: max TMDS clock 600000
kHz
[    1.864624] [drm:drm_mode_debug_printmodeline [drm]] Modeline "3840x2160":
60 594000 3840 4016 4104 4400 2160 2168 2178 2250 0x48 0x5
[    1.864629] [drm:drm_mode_prune_invalid [drm]] Not using 3840x2160 mode:
CLOCK_HIGH
[    1.864635] [drm:drm_mode_debug_printmodeline [drm]] Modeline "3840x2160":
30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x9
[    1.864640] [drm:drm_mode_prune_invalid [drm]] Not using 3840x2160 mode:
CLOCK_HIGH

It shows it is type 1 HDMI adapter with max TMDS clock: 165000 kHz which is
lower than the expectation of 3840x2160.  Although, the connected monitor ASUS
VP28U supports max TMDS clock 600000 kHz.

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