Laptop is connected monitor on the DisplayPort but it gets no signal

2xRon · 2014-11-27 22:04:40

I have a Dell Studio XPS 16 with the ATI Mobility Radeon HD4670 (open source drivers) connected to an Asus PB278Q over displayport (wm: DWM).

*xrandr*

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1920x1080+0+0 (normal left inverted right x axis y axis) 353mm x 198mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1400x1050     59.98  
   1280x1024     59.89  
   1440x900      59.89  
   1280x960      59.94  
   1280x854      59.89  
   1280x800      59.81  
   1280x720      59.86  
   1152x768      59.78  
   1024x768      59.92  
   800x600       59.86  
   848x480       59.66  
   720x480       59.71  
   640x480       59.38  
DisplayPort-0 connected (normal left inverted right x axis y axis)
   2560x1440     59.95 +
   1920x1080     59.99    60.00    50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1280x960      60.00  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1440x576      50.00  
   1024x768      75.08    70.07    60.00  
   1440x480      60.00    59.94  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    66.67    60.00    59.94  
   720x400       70.08

So, it connects to the monitor, and if I set up as a another screen I can move my mouse there. I can use the monitor over the displayport in Windows and it works with HDMI output in Arch (though the HDMI port is limited to 1920x1080) but with the DP in Arch I get no signal and the screen stays black. The display works (mirroring the laptop screen) during BIOS; it only turns off after GRUB loads so I cant see the OS selection menu on the external monitor.

Last edited by 2xRon (2014-11-28 07:23:30)

dice · 2014-12-03 18:02:54

2xRon wrote:

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192

This looks as if your monitors are set to be mirrored which does not work because of mismatching resolutions.
You could try something like

xrandr --output DisplayPort-0 --left-of LVDS

I don't know what how to configure dwm to make use of the screen because I never used it.

2xRon · 2014-12-29 03:12:19

I tried what you suggested. It acts like the monitor is there (I can move my mouse to where the new screen should be) but the screen still doesn't get a signal.

dice · 2014-12-29 09:54:44

I had this with xmonad too. maybe you have to tell dwm to use the second monitor. Or try another wm just to check if it works there.

Head_on_a_Stick · 2014-12-29 14:35:05

From the suckless site:
http://dwm.suckless.org/multi-monitor
I think you just need to add the `--auto` flag.

2xRon · 2014-12-30 01:08:45

Getting the same issue if I used the --auto flag and if I set the mode on the secondary monitor to 1920x1080. I've installed gnome but Im getting the same problem (gnome sees/identifies the second monitor and I can move my moutse there but no signal gets to the monitor). I haven gotten multiple monitors to work in the past (over the HDMI port).

Last edited by 2xRon (2014-12-30 01:10:25)

dice · 2014-12-30 08:53:39

http://dwm.suckless.org/multi-monitor wrote:

If configured to use Xinerama libraries in congik.mk, [..]

Is your dwm configured to use Xinerama libraries?

2xRon · 2014-12-31 20:14:14

Yes, or at least I think so

config.mk

cã# dwm version
VERSION = 6.0

# Customize below to fit your system

# paths
PREFIX = /usr/local
MANPREFIX = ${PREFIX}/share/man

X11INC = /usr/X11R6/include
X11LIB = /usr/X11R6/lib

# Xinerama
XINERAMALIBS = -L${X11LIB} -lXinerama
XINERAMAFLAGS = -DXINERAMA

# includes and libs
INCS = -I. -I/usr/include -I${X11INC} `pkg-config --cflags xft pango pangoxft`
LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 ${XINERAMALIBS} `pkg-config --libs xft pango pangoxft`

# flags
CPPFLAGS = -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
#CFLAGS = -g -std=c99 -pedantic -Wall -O0 ${INCS} ${CPPFLAGS}
CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
#LDFLAGS = -g ${LIBS}
LDFLAGS = -s ${LIBS}

# Solaris
#CFLAGS = -fast ${INCS} -DVERSION=\"${VERSION}\"
#LDFLAGS = ${LIBS}

# compiler and linker
CC = cc

I have gotten other monitors to work in the past, just not this one specifically on displayport.

dice · 2015-01-01 00:24:13

Could you post the output of xrandr right after you set the resolution of the monitor?
I noticed that in the output in your first post the displayport monitor is lacking an entry marked with a star. The star indicates the current set mode. So no mode was active thus the monitor obviously doesn't receive a signal.

tobixen · 2015-05-22 11:06:20

I think I have the same issue, but on a desktop computer.

It was booted in March without problems - both monitors working, being mirrored in console mode, and responding to xrandr.

Today after a boot - my "main" screen got black. The screens were in mirror mode during grub and early stages of boot, but early in the boot process the screen goes black. "No signal" on screen. It's black also if I boot in "single mode". Starting X and messing around with xrandr, xrandr reports that the screen is connected, but "no signal", whatever I do. Oh, once, right after starting X, it reported something like "wrong resolution, try 1920x1200 @ 60 Hz".

$ xrandr
Screen 0: minimum 320 x 200, current 3600 x 1200, maximum 8192 x 8192
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 connected 1920x1200+1680+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95*+
1920x1080 60.00 50.00 59.94
1920x1080i 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.95
1680x945 60.02
1400x1050 59.98
1600x900 59.98
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1366x768 60.02
1360x768 60.02
1280x800 59.81
1280x768 59.87
1280x720 60.00 50.00 59.94
1024x768 60.00
1024x576 59.97
800x600 60.32 56.25
720x576 50.00
848x480 60.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 60.00 59.94
VGA-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
1680x1050 59.95*+
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.08 60.00
800x600 75.00 60.32
640x480 75.00 60.00
720x400 70.08

Last edited by tobixen (2015-05-22 11:08:44)

tobixen · 2015-05-22 13:57:28

The exact error message shown on the monitor was:

Input Signal Out of Range
Change Settings to 1920x1200 - 60Hz

Could it be due to the slight difference between 59.95 Hz and 60 Hz?

I've tried other resolutions as well.

Interestingly, the VGA screen gets disturbed while xrand is running, and I once managed to trigger a "Monitor is going to sleep"-message on the DP-screen while running xrand.

SuperZanti · 2015-05-26 00:16:37

Have you tried using arandr?

What's your window manager?

tobixen · 2015-05-27 08:02:07

same results with arandr - it's just a GUI frontend to xrandr, isn't it?

I'm running spectrwm, but it shouldn't really make any difference. I'm starting up X manually after boot. As said, prior to the last rounds of upgrades the screens were mirrored in grub, during the boot and also in console mode. Now the monitor is mirrored in grub, but turns black relatively early in the boot process. I'm guessing there is some udev-rule kicking in and blacking out the monitor - though, I don't know much about udev, so I'm hesitating to experiment on it.

tobixen · 2015-06-16 10:56:42

I blacklisted the radeon kernel module and the issue with the screen going black disappeared. But when entering X, I was unable to use the DP-monitor for anything but mirroring my VGA monitor anyway.

It seems like my options are to investigate the OSS-alternatives to the radeon driver, to find an old version of the radeon driver or to try to report the issue upstream and hope for the issue to be fixed in the next release.

Post-edit: apparently I'm using the OSS driver

Last edited by tobixen (2015-06-16 11:08:20)

tobixen · 2015-06-16 11:08:00

Oh, apparently I'm using the OSS driver.

Anyway, the xf86-video-ati package installs the files /usr/lib/xorg/modules/drivers/ati_drv.so and
/usr/lib/xorg/modules/drivers/radeon_drv.so but it's apparently /lib/modules/4.0.5-1-ARCH/kernel/drivers/gpu/drm/radeon that is causing problems for me.

Last edited by tobixen (2015-06-16 11:12:32)

Arch Linux

#1 2014-11-27 22:04:40

Laptop is connected monitor on the DisplayPort but it gets no signal

#2 2014-12-03 18:02:54

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#3 2014-12-29 03:12:19

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#4 2014-12-29 09:54:44

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#5 2014-12-29 14:35:05

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#6 2014-12-30 01:08:45

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#7 2014-12-30 08:53:39

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#8 2014-12-31 20:14:14

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#9 2015-01-01 00:24:13

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#10 2015-05-22 11:06:20

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#11 2015-05-22 13:57:28

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#12 2015-05-26 00:16:37

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#13 2015-05-27 08:02:07

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#14 2015-06-16 10:56:42

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

#15 2015-06-16 11:08:00

Re: Laptop is connected monitor on the DisplayPort but it gets no signal

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