[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 #12 from jian-hong at endlessm.com ---
Created attachment 145962
  --> https://bugs.freedesktop.org/attachment.cgi?id=145962&action=edit
Acer XC-860 dmesg with DRM debug

We have got another Acer desktop XC-860 equipped with i3-9100 CPU.

00:02.0 VGA compatible controller [0300]: Intel Corporation 8th Gen Core
Processor Gaussian Mixture Model [8086:3e91] (prog-if 00 [VGA controller])
        Subsystem: Acer Incorporated [ALI] 8th Gen Core Processor Gaussian
Mixture Model [1025:1294]
        Flags: bus master, fast devsel, latency 0, IRQ 126
        Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
        Memory at 90000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 4000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [40] Vendor Specific Information: Len=0c <?>
        Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
        Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [100] Process Address Space ID (PASID)
        Capabilities: [200] Address Translation Service (ATS)
        Capabilities: [300] Page Request Interface (PRI)
        Kernel driver in use: i915
        Kernel modules: i915

Acer's ODM said this is HDMI 2.0 adapter onboard.  But it is detected as type 1
HDMI, so the max TMDS clock is set as 165 MHz. Therefore, all of the 3840x2160
resolution combinations on the list are disabled.  It also hits the same issue.

[    1.392657] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI
ID: DP-HDMI ADAPTOR\004 (err 0)
[    1.393770] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode
adaptor ID: ff (err 0)
[    1.393797] [drm:intel_hdmi_set_edid [i915]] DP dual mode adaptor (type 1
HDMI) detected (max TMDS clock: 165000 kHz)
[    1.393822] [drm:drm_detect_monitor_audio [drm]] Monitor has basic audio
support
[    1.393826] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:68:HDMI-A-1] status updated from unknown to connected
[    1.393834] [drm:drm_add_display_info [drm]] non_desktop set to 0
[    1.393840] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS
clock 600000 kHz
[    1.393846] [drm:drm_add_display_info [drm]] HF-VSDB: max TMDS clock 600000
kHz
[    1.393860] [drm:drm_add_edid_modes [drm]] ELD monitor ASUS VP28U
[    1.393884] [drm:drm_add_edid_modes [drm]] HDMI: latency present 0 0, video
latency 0 1, audio latency 96 2
[    1.393889] [drm:drm_add_edid_modes [drm]] ELD size 36, SAD count 1
[    1.393895] [drm:drm_add_display_info [drm]] non_desktop set to 0
[    1.393901] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS
clock 600000 kHz
[    1.393907] [drm:drm_add_display_info [drm]] HF-VSDB: max TMDS clock 600000
kHz
[    1.394200] [drm:drm_mode_debug_printmodeline [drm]] Modeline "3840x2160":
60 594000 3840 4016 4104 4400 2160 2168 2178 2250 0x48 0x5
[    1.394205] [drm:drm_mode_prune_invalid [drm]] Not using 3840x2160 mode:
CLOCK_HIGH
[    1.394211] [drm:drm_mode_debug_printmodeline [drm]] Modeline "3840x2160":
30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x9
[    1.394217] [drm:drm_mode_prune_invalid [drm]] Not using 3840x2160 mode:
CLOCK_HIGH
[    1.394222] [drm:drm_mode_debug_printmodeline [drm]] Modeline "2560x1440":
60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0x5
[    1.394228] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1440 mode:
CLOCK_HIGH
[    1.394234] [drm:drm_mode_debug_printmodeline [drm]] Modeline "2560x1600":
60 268500 2560 2608 2640 2720 1600 1603 1609 1646 0x40 0x9
[    1.394239] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1600 mode:
CLOCK_HIGH

Seems more and more machines hit this issue.

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