Thread: Laptop + external VGA monitor - mode issue

i having problem external monitors when connected laptop through vga port.

resolution dimensions correct (1280x1024, etc) monitor connect, there seems call interlace effect happening (i'm not sure if interlace cause or not).

vga port , monitor work fine in windows must configuration issue. suspect has xorg.conf file definition of monitor, need bit of going through process.

2 web pages have been following try , figure out these, , last 1 actual specifications of external monitor (page 13):

code:

https://wiki.ubuntu.com/x/config/resolution

code:

http://www.x.org/wiki/faqvideomodes#head-82230a582646cbf28ac41dec2139732ee868e0d2  http://igor.chudov.com/manuals/nec-accusync-lcd72vx-users-manual.pdf

the laptop dell vostro 3300.

here current xorg.conf file:

code:

section "device"  	identifier	"default device"  	option	"nologo"	"true"  endsection

here vga adapters:
using default ubuntu drivers, not proprietary nvidia drivers (the vga display has same problem nvidia drivers)

code:

ron@ron-vostro-3300:/etc/x11$ lspci | grep vga  00:02.0 vga compatible controller: intel corporation core processor integrated graphics controller (rev 18)  01:00.0 vga compatible controller: nvidia corporation gt218 [geforce 310m] (rev a2)

here xrandr output:

code:

ron@ron-vostro-3300:/etc/x11$ xrandr  screen 0: minimum 320 x 200, current 2646 x 1024, maximum 8192 x 8192  lvds1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 293mm x 164mm     1366x768       60.2*+   40.0       1360x768       59.8     60.0       1024x768       60.0       800x600        60.3     56.2       640x480        59.9    vga1 connected 1280x1024+1366+0 (normal left inverted right x axis y axis) 376mm x 301mm     1280x1024      60.0*+   75.0       1280x960       75.0       1152x864       75.0       1024x768       75.1     70.1     60.0       832x624        74.6       800x600        72.2     75.0     60.3     56.2       640x480        72.8     75.0     66.7     60.0       720x400        70.1       1280x1024_108   60.0    ron@ron-vostro-3300:/etc/x11$

from windows got specifications of monitor working correctly using power strip:

code:

powerstrip timing parameters:  1280x1024=1280,48,112,248,1024,1,3,38,108000,512    generic timing details 1280x1024:  hfp=48 hsw=112 hbp=248 khz=64 vfp=1 vsw=3 vbp=38 hz=60    vesa detailed timing:  pclk=108.00 h.active=1280 h.blank=408 h.offset=32 hsw=112 v.active=1024 v.blank=42 v.offset=1 vsw=3    linux modeline parameters:  "1280x1024" 108.000 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync

if understand correctly, monitor display modes must set in either monitors.xml file or xorg.conf file. when monitors modes have been defined can graphics card mode set matching mode. if mode set graphics card , has not been defined mode monitor can support not work. please correct me if i'm wrong.

if next steps appreciate it.

hi moizbhukhiya, have optimus. kind of new graphic architecture , it's starting supported on linux. despite fact, there couple of projects in progress have success support it.

advice start reading couple of useful threads. this 1 understand (but pessimist). , other 1 (from post #7), more practical approach.

there laptops can either disable it, or simplify things turning off nvidia card. check bios if have of options.

hope helps,
regards.

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