Arch Linux

dewillepl

Member

Registered: 2016-02-12

Posts: 13

xrandr doesn't detect VGA output

I have an external FHD Dell monitor connected to my Dell notebook via VGA port. It's working in mirror mode by default and i can't change this and also can't change external display resolution which is the same as my notebook display 1366x768. When i run xrandr it doesn't detect VGA output for some reasons :

$ xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1366 x 768, current 1366 x 768, maximum 1366 x 768
default connected primary 1366x768+0+0 0mm x 0mm
   1366x768       0.00* 

lspci output

$ lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)

lshw output

$ sudo lshw -C display
  *-display                 
       description: VGA compatible controller
       product: 2nd Generation Core Processor Family Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:25 memory:f7800000-f7bfffff memory:e0000000-efffffff ioport:f000(size=64) memory:c0000-dffff

Plasma settings shows only default display - no external, and Unify Outputs is grayed out

http://i.imgur.com/rT34svK.png

To sum up : external display connected to notebook via VGA is working but only as notebook screen clone with the same resolution as notebook. xrandr is not detecting VGA port. Is there any other way to fix this ? Like setting xorg.conf up ??

Thanks

-- mod edit: replaced img with url tags.  Please see guidelines on image sizes.  Trilby --

Last edited by Trilby (2016-11-07 14:42:45)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 78,562

Re: xrandr doesn't detect VGA output

Probably a kernel bug, try downgrading or the lts kernel:
https://bbs.archlinux.org/viewtopic.php?id=217348

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dewillepl

Member

Registered: 2016-02-12

Posts: 13

Re: xrandr doesn't detect VGA output

I'm currently on 4.8.6-1 - will give a try with downgrading bc this is definitely something wrong with my actual configuration.  If i run Manjaro from USB external display works like harm

EDIT: Downgrade to 4.6.4-1 didn't fix that problem. At the moment it's not big problem, because I'm going to change my notebook to new one with fresh Arch installation next week

Last edited by dewillepl (2016-11-08 13:24:57)