On Saturday 01 Dec 2012 09:49:01 Nuno J. Silva wrote: > On 2012-12-01, Grant wrote: > >> > I've connected my laptop to a lot of HDTV's and whenever I switch > >> > the output to display on both screens, black bars appear on the > >> > left and right of my laptop screen so it displays at 4:3, and the > >> > HDTV output is 16:9 but looks horizontally stretched. Does > >> > anyone know how to keep the output at 16:9 on both screens? > >> > > >> > - Grant > >> > >> You don't give a lot of information here. Are you using mirrored > >> screen or an extended desktop? Also what is the desktop environment or > >> window manager you use? > >> > >> On thing that might help is to provide the output of xrandr. > > > > I'm using xfce4, but I'm not sure if I'm using a mirrored screen or an > > extended desktop. All I do is plug the laptop into the HDTV with an HDMI > > cable and hit the keyboard shortcut to switch screens which brings up a > > little dialog. > > There is nothing too complex here, if the TV and laptop are showing the > same thing, one screen is *mirroring* the other, otherwise, if you see > different things in different screens, you're using an extended desktop. > > > I was able to change the resolution from 1024x768 to 1366x768 with > > xfce4's Display settings, but when I disconnect and reconnect to the > > HDTV it displays at 1024x768 again. Do you know how to select the > > output resolution for an external screen permanently? Is this done in > > xorg.conf? > > This is, I'd guess, a "preferred" video mode announced through EDID, > where the TV, even if it supports 1366x768, will anounce 1024x768 as > preferred. You could do the change with a small xrandr one-liner, and > there must be some way to do it through xorg.conf, although I don't know > how. > > In the end, having the output of xrandr (both before and after you > change the video modes) would help *a lot*, as it answers most of our > questions...
You can set this up either with xranrd entries in your ~/.xprofile or in your
/etc/X11/xorg.conf
First run xrandr -q to see what you get from an xterminal and then manually
alter the resolution according to your requirements on each screen, e.g.
xrandr --output DVI0 --mode 1366x768 --rate 60
xrandr --output LVDS1 --primary
xrandr --output TV1 --mode 1920x1080
etc. until you get things as you want them.
Look at your /var/log/Xorg.0.log to see what resolution and refresh rate your
card can do, although xrandr -q will show this. The refresh rate is not
really required (I think it is automatically set to match the screen
resolution).
You can if you prefer set it up in /etc/X11/xorg.conf:
Name your monitors in your Section "Device":
===========================================
Section "Device"
[snip ...]
Identifier "Card0"
Driver "radeon"
BusID "PCI:1:0:0"
Option "monitor-VGA" "my 2nd monitor"
Option "monitor-LVDS" "my laptop"
Option "monitor-TV1" "my TV"
EndSection
===========================================
Then set up the screen resolutions for each monitor:
===================================================
Section "Monitor"
Identifier "my 2nd monitor"
Option "PreferredMode" "1024x768"
Option "Position" "1024 0"
EndSection
Section "Monitor"
Identifier "my laptop"
Option "PreferredMode" "1366x768"
Option "LeftOf" "my 2nd monitor"
EndSection
[snip ...]
EndSection
===================================================
Then set up the default screen:
==============================
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "my laptop"
[snip ...]
==============================
The above is just a guide of course. You can tweak it according to your
requirements and see what gives. For more permanent set ups I would tend to
use xorg.conf (old habits die hard), but .xprofile may be quicker/easier to
try out.
--
Regards,
Mick
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