Created attachment 90921 [details] dmesg Environment: -------------------------- Platform: Broadwell Kernel: (drm-intel-nightly) 22dd82bce1840fe48d683a29cccc443281b10248 Bug detailed description: ----------------------------- DP monitor unable to detected by hot-plug We tested hot-plug first time, and didn't find good point. Steps: --------------------------- 1. boot OS only with eDP 2. Hot-plug DP cable, the monitor will show "Display NO SIGNAL" 3. If boot with DP, unplug then plug, DP monitor is able to detected.
What happens when you manually run xrandr in the failing case? Do we detect a monitor (i.e. is only the hotplug event not working) or do we completely fail to detect the screen?
Ỳang Guang said that booting with HDMI, unplug and then plugging in DP also doesn't work. Is that correct?
(In reply to comment #1) > What happens when you manually run xrandr in the failing case? Do we detect > a monitor (i.e. is only the hotplug event not working) or do we completely > fail to detect the screen? The DP is able to detect by xrandr, but the monitor shows "There is no signal coming from your computer". [root@x-bdw01 ~]# xrandr Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767 eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 282mm x 165mm 1920x1080 60.0*+ 40.0 1400x1050 60.0 1280x1024 60.0 1280x960 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 DP1 connected (normal left inverted right x axis y axis) 2560x1600 60.0 + 1920x1440 60.0 1920x1200 59.9 1920x1080 60.0 50.0 59.9 24.0 24.0 1920x1080i 60.1 50.0 60.0 1600x1200 60.0 1280x1024 75.0 60.0 1280x800 59.8 1152x864 75.0 1280x720 60.0 50.0 59.9 1024x768 75.1 60.0 800x600 75.0 60.3 720x576 50.0 720x480 60.0 59.9 640x480 75.0 60.0 59.9 720x400 70.1 HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) VIRTUAL1 disconnected (normal left inverted right x axis y axis) You have new mail in /var/spool/mail/root
(In reply to comment #2) > Ỳang Guang said that booting with HDMI, unplug and then plugging in DP also > doesn't work. Is that correct? Yes, Guang is right.
Sounds very much like we fail to set up some DDI state between HDMI/DP switching. Paulo?
So the display can come up if you set a mode on it explicitly. But I see what look to be DP timeouts, or at least really slow mode enumeration and mode setting. Still looking.
Please try this: http://lists.freedesktop.org/archives/intel-gfx/2014-January/038161.html
This should be fixed with commit 09f2344d0896eb458a639b922224c7a202c11599 Author: Jesse Barnes <jbarnes@virtuousgeek.org> Date: Fri Jan 10 13:13:09 2014 -0800 drm/i915/bdw: make sure south port interrupts are enabled properly v2 *** This bug has been marked as a duplicate of bug 72833 ***
Our Broadwell doesn't work now, we are repairing it. And I will verify this bug when the Broadwell had repaired. Thanks.
Verified on latest -fixes (9f2344d0896eb458a639b922224c7a202c11599), this bug had fixed, thanks.
Closing old verified.
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