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bdug

Member

Registered: 2016-10-09

Posts: 7

problem with the display manager

I installed a kali linux with xfce on an old eepc. It works fine except dual screen

If I boot without the external vga monitor plugged and then if after the login step I plug the vga monitor then I can successfully setup the extended display.

However If I reboot with the external monitor plugged then the laptop monitor will remain blank whatever I do, even if I unplug and replug the external monitor.

any help would be appreciated

Thx in advance

Last edited by bdug (2016-10-10 00:04:22)

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 11,494

Re: problem with the display manager

What version of Xfce does kali run and more specifically, which version of xfce4-settings? There have been a couple of bug fixes for external monitor issues in 4.12.1 (see: https://git.xfce.org/xfce/xfce4-settings/log/).

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bdug

Member

Registered: 2016-10-09

Posts: 7

Re: problem with the display manager

it is version 4.12

bdug

Member

Registered: 2016-10-09

Posts: 7

Re: problem with the display manager

and xfce4-settings version is 4.12.1-1

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 11,494

Re: problem with the display manager

Perhaps you should file a bug report against xfce4-settings for this issue.

As for a workaround, does running:

xrandr --auto

...help with scenario #2?

If not, what does xrandr return when the VGA monitor is plugged in?

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bdug

Member

Registered: 2016-10-09

Posts: 7

Re: problem with the display manager

no effect at all
no value returned

I  filed a bug

thx for your help

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 11,494

Re: problem with the display manager

no value returned

No response to "xrandr"? Not even an error message?? That's really odd. What graphics driver are you using?

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bdug

Member

Registered: 2016-10-09

Posts: 7

Re: problem with the display manager

no response at all not even an error message.

for the graphic driver I am not sure of where to look at.

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Atom Processor D2xxx/N2xxx Integrated Graphics Controller (rev 09)

egrep -i " connected|card detect|primary dev|Setting driver" /var/log/Xorg.0.log
[    22.754] (II) modeset(0): Output VGA-1 connected
[    22.754] (II) modeset(0): Output LVDS-1 connected

Last edited by bdug (2016-10-11 02:45:33)

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 11,494

Re: problem with the display manager

What does the following return?

lspci -v | grep -A10 VGA

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bdug

Member

Registered: 2016-10-09

Posts: 7

Re: problem with the display manager

lspci -v | grep -A10 VGA
00:02.0 VGA compatible controller: Intel Corporation Atom Processor D2xxx/N2xxx Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
	DeviceName:  Onboard IGD
	Subsystem: ASUSTeK Computer Inc. Atom Processor D2xxx/N2xxx Integrated Graphics Controller
	Flags: bus master, fast devsel, latency 0, IRQ 30
	Memory at dfc00000 (32-bit, non-prefetchable) [size=1M]
	I/O ports at f0e0 [size=8]
	[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: [d0] Power Management version 2
	Capabilities: [b0] Vendor Specific Information: Len=07 <?>
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Kernel driver in use: gma500

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 11,494

Re: problem with the display manager

I'm by no means an expert on video cards/drivers, but your system is using the gma500 (poulsbo) driver.  I believe you need to do some further configuration to get it to properly support xrandr and multiple monitors. Here are some references that I was able to locate:
- https://wiki.ubuntu.com/HardwareSupport … rdsPoulsbo
- https://wiki.archlinux.org/index.php/Intel_GMA_500
- http://forums.fedoraforum.org/showthread.php?t=286223

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bdug

Member

Registered: 2016-10-09

Posts: 7

Re: problem with the display manager

tyvm Toz but I dont want to enter into this since I would not know what I would be doing. I dont want to messup my system.
I found a manual workaround for dual screen to work: I switch on the external monitor after the boot sequence just before login in