Created attachment 122380 [details] bsw-kern.log Hardware: Motherboard: Aspire XC-704 cpu model name : Intel(R) Pentium(R) CPU N3700 @ 1.60GHz cpu model : 76 cpu family : 6 Graphic card: Device 22b1 (rev 21) Software: Ubuntu 14.04 Bios: R01-A2 Kernel mainline 4.4.0 from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git commit afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc Author: Linus Torvalds <torvalds@linux-foundation.org> Date: Sun Jan 10 15:01:32 2016 -0800 Linux 4.4 drm: libdrm-2.4.67-5 ea07de9 from git://anongit.freedesktop.org/mesa/drm mesa: tag mesa-11.1.2 7bcd827 from git://anongit.freedesktop.org/mesa/mesa cairo: tag 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo waffle: master bb29b2a from git://github.com/waffle-gl/waffle xorg-server-macros: tag: util-macros-1.19.0-2 d7acec2 from git://git.freedesktop.org/git/xorg/util/macros xserver: tag: xorg-server-1.18.1 23e60f9 from git://git.freedesktop.org/git/xorg/xserver xf86-video-intel: tag 2.99.917-560 d167280 from git://anongit.freedesktop.org/xorg/driver/xf86-video-intel libva: tag libva-1.7.0.pre1 35f1447 from git://git.freedesktop.org/git/vaapi/libva vaapi-intel-driver: tag 1.7.0.pre1 ab8e4e3 from git://anongit.freedesktop.org/vaapi/intel-driver IGT 1.14 364d378 from http://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.git External screen: Asus PB238Q Steps: ------ 1. Shutdown 2. Unplug external screen 3. Power on 4. Wait a moment 5. Hotplug HDMI cable Actual result: -------------- 5. Screen turns on and displays "HDMI no signal" and turns off Expected result: ---------------- 5. Display works when hot-pluging screen after boot Info: ----- DUT is responding via SSH Not reproduced when booting with the screen connected
Reproduced with following steps: 1. Boot with screen connected, execute command "cat /proc/asound/card*/eld" 2. Execute command: "udevadm monitor" 3. Unplug HDMI cable 4. Plug it again, execute command "cat /proc/asound/card*/eld" Actual result: -------------- 1. $ cat /proc/asound/card*/eld* monitor_present 1 eld_valid 1 monitor_name ASUS PB238 connection_type HDMI eld_version [0x2] CEA-861D or below edid_version [0x3] CEA-861-B, C or D manufacture_id 0x6904 product_id 0x23a2 port_id 0x0 support_hdcp 0 support_ai 0 audio_sync_delay 0 speakers [0x1] FL/FR sad_count 1 sad0_coding_type [0x1] LPCM sad0_channels 2 sad0_rates [0x4e0] 32000 44100 48000 96000 sad0_bits [0xe0000] 16 20 24 monitor_present 0 eld_valid 0 3. $ udevadm monitor monitor will print the received events for: UDEV - the event which udev sends out after rule processing KERNEL - the kernel uevent KERNEL[97.764995] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm) UDEV [97.768234] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm) 4. "udevadm monitor" does not output any log $ cat /proc/asound/card*/eld* monitor_present 0 eld_valid 0 monitor_present 0 eld_valid 0 Screen stays off
HPD doesn't work when the display power well is down. *** This bug has been marked as a duplicate of bug 89008 ***
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