CPU: Intel Coffee Lake Graphic:Intel [8086:3e92] Kernel: 4.14.0-997 http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/2017-09-30/ Monitor: asus PA238Q/Dell P2415Qb Only can reproduce the issue with asus PA238Q.
Created attachment 134901 [details] kern.log and Xorg.0.log Test Result: 1. asus PA238Q 4.13.0-997: Pass 4.13.0-997 + i915.alpha_support=1: Failed 4.14.0-997: Failed 2. dell P2415Qb 4.13.0-997: Pass 4.14.0-997: Pass log_1018.tar.gz ├── asus_pa238q │ ├── 4.13.0-997 │ │ ├── kern.log │ │ └── Xorg.0.log │ ├── 4.13.0-997-i915_alpha_support │ │ ├── kern.log │ │ └── Xorg.0.log │ └── 4.14.0-997 │ ├── kern.log │ └── Xorg.0.log ├── dell_p2415qb │ ├── 4.13.0-997 │ │ ├── kern.log │ │ └── Xorg.0.log │ └── 4.14.0-997 │ ├── kern.log │ └── Xorg.0.log ├── dmidecode.log ├── lspci-nn.log
log_1018.tar.gz /asus_pa238q/4.14.0-997/Oct 18 15:31:01 u-OptiPlex-5060 kernel: [2.818759] [drm] Initialized i915 1.6.0 20170929 for 0000:00:02.0 on minor 0 [3.241622] i915 0000:00:02.0: HDMI-A-1: EDID is invalid: [3.725350] [drm] Cannot find any crtc or sizes [4.179233] [drm] Cannot find any crtc or sizes
Got one MB with HDMI port. The issue can be reproduced when connected with asus HDMI monitor directly without HDMI to DP adapter.
Could you please boot 4.14 again with drm.debug=0x1e and grab dmesg output. Thanks in advance.
Created attachment 136047 [details] dmesg (drm.debug=0x1e) dmesg (drm.debug=0x1e) Kernel: 4.14.0-997 http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/2017-12-03/
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