Sounds similar to a problem I had with my TV. It's EDID incorrectly lists only one mode (1280x720 50 Hz), but it supports up to 1920x1080 at a variety of refresh rates. I verified this by dumping the EDID and checking it.
I wrote up my experience here: http://www.tolaris.com/2009/04/14/enabling-1080p-video-on-the-shuttle-x27d-htpc/ However, this may not be your problem. For one, I no longer have this issue on precise or quantal. The display defaulted to 1280x720 but I was able to use the "Displays" application to set it to the higher resolution by selecting it from the pull-down menu. If it does apply to you, I hope the post helps. You can at least check your EDID data or force a mode in various ways. Regards, Tyler On 2013-04-20 17:34, pete smout wrote: > Hi, > > I have been trying without success to get my ubuntu precise (upgraded from > oneric) to accept the same resolution on my tv as 10.04 (Lucid) did. (I > still have lucid on a spare hdd so I can check settings). > > The Problem: > TV (when connected via VGA (Out on laptop)- VGA (PC input)on TV) > On Lucid resolution was 1360 x 768 (16:9) 60hz. which worked perfectly well > (with virtually zero input from me). > On Precise i get 1024 x 768 (6:9) 60hz. Which means that I have an ugly > 2inch gap down the left of the screen, and the bottom couple of inches > below the edge of the physical screen. (I hope this makes sense) > > This confusing problem led me on a google-thon and I have got this far. > > The Output from xandr in terminal with TV connected: > > pete@petes-lappy:~$ xrandr > > Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192 > > LVDS1 connected (normal left inverted right x axis y axis) > > 1280x800 60.0 + > > 1024x768 60.0 > > 800x600 60.3 56.2 > > 640x480 59.9 > > VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm > x 0mm > > 1024x768 60.0* > > 800x600 60.3 56.2 > > 848x480 60.0 > > 640x480 59.9 > > TV1 disconnected (normal left inverted right x axis y axis) > > > As you can see 1360 x 768 (or anything close is *not* an option) so I am > left trying to devise a way of getting it! > > i have run gtf in terminal and get the following: > > pete@petes-lappy:~$ gtf 1360 768 60 > > # 1360x768 @ 60.00 Hz (GTF) hsync: 47.70 kHz; pclk: 84.72 MHz > > Modeline "1360x768_60.00" 84.72 1360 1424 1568 1776 768 769 772 795 > -HSync +Vsync > > > Which gave me the idea of constructing a script to create the modeline > (which if necessary I can run every time I plug the TV in) > > The script I devised: > > #This line adds modeline from output of gtf command > > # 1368x768 @ 60.00 Hz (GTF) hsync: 47.70 kHz; pclk: 85.86 MHz > > xrandr --VGA1 "1368x768_60.00" 85.86 1368 1440 1584 1800 768 769 772 > 795 -HSync +Vsync > > #This line adds the mode as it is not default > > xrandr --addmode VGA1 1368x768_60 > > #This line sets resolution on VGA1 > > xrandr --output VGA1 --mode 1368x768_60 > > Returns the following error: > > pete@petes-lappy:~$ /home/pete/Desktop/tv.bash > > usage: xrandr [options] > > where options are: > > -display <display> or -d <display> > > -help > > -o <normal,inverted,left,right,0,1,2,3> > > or --orientation <normal,inverted,left,right,0,1,2,3> > > -q or --query > > -s <size>/<width>x<height> or --size <size>/<width>x<height> > > -r <rate> or --rate <rate> or --refresh <rate> > > -v or --version > > -x (reflect in x) > > -y (reflect in y) > > --screen <screen> > > --verbose > > --current > > --dryrun > > --nograb > > --prop or --properties > > --fb <width>x<height> > > --fbmm <width>x<height> > > --dpi <dpi>/<output> > > --output <output> > > --auto > > --mode <mode> > > --preferred > > --pos <x>x<y> > > --rate <rate> or --refresh <rate> > > --reflect normal,x,y,xy > > --rotate normal,inverted,left,right > > --left-of <output> > > --right-of <output> > > --above <output> > > --below <output> > > --same-as <output> > > --set <property> <value> > > --scale <x>x<y> > > --transform <a>,<b>,<c>,<d>,<e>,<f>,<g>,<h>,<i> > > --off > > --crtc <crtc> > > --panning > <w>x<h>[+<x>+<y>[/<track:w>x<h>+<x>+<y>[/<border:l>/<t>/<r>/<b>]]] > > --gamma <r>:<g>:<b> > > --primary > > --noprimary > > --newmode <name> <clock MHz> > > <hdisp> <hsync-start> <hsync-end> <htotal> > > <vdisp> <vsync-start> <vsync-end> <vtotal> > > [+HSync] [-HSync] [+VSync] [-VSync] > > --rmmode <name> > > --addmode <output> <name> > > --delmode <output> <name> > > xrandr: cannot find mode "1360x768_60" > > xrandr: cannot find mode 1360x768_60 > > > If any one can tell me where I am going wrong (or an easier way of going > about it) please let me know!! > > > Regards > > Pete Smout > > -- "When a claim is falsified in science [...], it is discarded. It is put in the trashbin of bad ideas. When a claim of religion is falsified, it becomes a metaphor." -- Jerry Coyne -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/
