Created attachment 94410 [details] dmesg after boot up with two pipes (HDMI&VGA) Environment: ------------------- Kernel: (drm-intel-next-queued) 4c0e552882114d1edb588242d45035246ab078a0 Description: ------------------------ When the desktop is booted up with HDMI and VGA connected, only the HDMI monitor lighted up normally. But when run "testdisplay -i", it showed that both VGA and HDMI are connected,and "testdisplay -a" also works well on both of them. When plugged in HDMI or VGA separately at one time, they all work well. This is a regression. I bisected it and it showed: eb1bfe807cb7b62a326fa20df5e3118a32c6f923 is the first bad commit commit eb1bfe807cb7b62a326fa20df5e3118a32c6f923 Author: Jesse Barnes <jbarnes@virtuousgeek.org> Date: Wed Feb 12 12:26:25 2014 -0800 drm/i915: allow re-use BIOS connector config for initial fbdev config v3 The BIOS or boot loader will generally create an initial display configuration for us that includes some set of active pipes and displays. This routine tries to figure out which pipes and connectors are active and stuffs them into the crtcs and modes array given to us by the drm_fb_helper code. The overall sequence is: intel_fbdev_init - from driver load intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data drm_fb_helper_init - build fb helper structs drm_fb_helper_single_add_all_connectors - more fb helper structs intel_fbdev_initial_config - apply the config drm_fb_helper_initial_config - call ->probe then register_framebuffer() drm_setup_crtcs - build crtc config for fbdev intel_fb_initial_config - find active connectors etc drm_fb_helper_single_fb_probe - set up fbdev intelfb_create - re-use or alloc fb, build out fbdev structs v2: use BIOS connector config unconditionally if possible (Daniel) check for crtc cloning and reject (Daniel) fix up comments (Daniel) v3: use command line args and preferred modes first (Ville) Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com> [danvet: Re-add the WARN_ON for a missing encoder crtc - the state sanitizer should take care of this. And spell-ocd the comments.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> :040000 040000 dbe7ef821ba404c994fbc579461b7e0d4febf10a 1b40c56483f03c15ae495a85a78fe740beeeb0e9 M drivers I think this bug may be related to Bug 75077. Test Step: -------------------- 1. connect HDMI&VGA 2. Boot up 3. testdisplay -i 4. testdisplay -a
What is the bug here? It is just a change in default behaviour, but nothing appears to be broken.
Yeah this is just a change in behavior. As long as we can still light up HDMI and VGA later with testdisplay, X, or whatever, there's no bug here.
(In reply to comment #2) > Yeah this is just a change in behavior. As long as we can still light up > HDMI and VGA later with testdisplay, X, or whatever, there's no bug here. When start X, xrandr shows that HDMI and VGA are connected, while only the HDMI monitor can display the X window correctly and the VGA monitor still stays black. After I start gnome-session, then the monitors both can show correctly. As all these behaviour above, shall we close this bug?
Does xrandr say they are connected and enabled? If nothing tries to configure the extra pipes, they will remain off. Please paste the output of xrandr after X starts, and after running xrandr --auto.
(In reply to comment #4) > Please paste the output of xrandr after X starts, and after running xrandr > --auto. After the system boot up with VGA and HDMI connected and X starts, the HDMI monitor can display correctly and the VGA stays black. At this moment, the xrandr shows: Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767 VGA1 connected (normal left inverted right x axis y axis) 1680x1050 59.95 + 1280x1024 75.02 60.02 1280x960 60.00 1152x864 75.00 1024x768 75.08 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 640x480 75.00 72.81 66.67 60.00 720x400 70.08 HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm 1920x1080 60.00*+ 50.00 59.94 1920x1080i 60.00 50.00 59.94 1280x1024 75.02 60.02 1152x864 75.00 1280x720 60.00 50.00 59.94 1440x576i 50.00 1024x768 75.08 60.00 1440x480i 60.00 59.94 800x600 75.00 60.32 720x576 50.00 720x480 60.00 59.94 640x480 75.00 60.00 59.94 720x400 70.08 DP1 disconnected (normal left inverted right x axis y axis) HDMI3 disconnected (normal left inverted right x axis y axis) VIRTUAL1 disconnected (normal left inverted right x axis y axis) Then after I run xrandr --auto, the VGA and HDMI can both show the X window correctly.
*** Bug 74962 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of bug 75077 ***
Closing verified as duplicate of closed+verified.
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