No Signal for External Monitor at 1920x1080 with 945GME over VGA

bdjnk · 2012-05-09 18:05:33

I am connecting my Samsung NC10, via VGA, to a Sony KDL-46S5100 TV. The trouble is that the highest resolution of 1920x1080 gives me a No Signal message on the TV.

lspci

...
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GME Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
...

xrandr

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 4096 x 4096
LVDS1 connected 1024x600+0+0 (normal left inverted right x axis y axis) 222mm x 130mm
   1024x600       60.0*+
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
   1920x1080      60.0 +
   1280x1024      60.0* 
   1360x768       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0

Using either arandr to set the resolution or setting it manually with

xrandr --output VGA1 --mode 1920x1080 --rate 60

results in this No Signal issue.

I know very similar problems have been solved by modifying xorg.conf, but I don't have one! Maybe I should?

Although I don't think this says anything useful, here is the content appended to Xorg.0.log when attempting to switch from 1280x1024 to 1920x1080, then switching back a few seconds later:

[213605.255] (II) intel(0): EDID vendor "CPT", prod id 1220
[213605.255] (II) intel(0): Printing DDC gathered Modelines:
[213605.256] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 1200  600 603 609 625 -hsync -vsync (37.5 kHz eP)
[213605.337] (II) intel(0): Allocated new frame buffer 1920x1080 stride 8192, tiled
[213605.990] (II) intel(0): EDID vendor "CPT", prod id 1220
[213605.990] (II) intel(0): Printing DDC gathered Modelines:
[213605.990] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 1200  600 603 609 625 -hsync -vsync (37.5 kHz eP)
[213606.160] (II) intel(0): EDID vendor "CPT", prod id 1220
[213606.160] (II) intel(0): Printing DDC gathered Modelines:
[213606.160] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 1200  600 603 609 625 -hsync -vsync (37.5 kHz eP)
[213606.982] (II) intel(0): EDID vendor "CPT", prod id 1220
[213606.982] (II) intel(0): Printing DDC gathered Modelines:
[213606.983] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 1200  600 603 609 625 -hsync -vsync (37.5 kHz eP)
[213614.911] (II) intel(0): EDID vendor "CPT", prod id 1220
[213614.911] (II) intel(0): Printing DDC gathered Modelines:
[213614.911] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 1200  600 603 609 625 -hsync -vsync (37.5 kHz eP)
[213615.039] (II) intel(0): Allocated new frame buffer 1280x1024 stride 8192, tiled
[213615.313] (II) intel(0): EDID vendor "CPT", prod id 1220
[213615.313] (II) intel(0): Printing DDC gathered Modelines:
[213615.313] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 1200  600 603 609 625 -hsync -vsync (37.5 kHz eP)
[213615.479] (II) intel(0): EDID vendor "CPT", prod id 1220
[213615.479] (II) intel(0): Printing DDC gathered Modelines:
[213615.479] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 1200  600 603 609 625 -hsync -vsync (37.5 kHz eP)
[213615.846] (II) intel(0): EDID vendor "CPT", prod id 1220
[213615.846] (II) intel(0): Printing DDC gathered Modelines:
[213615.846] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 1200  600 603 609 625 -hsync -vsync (37.5 kHz eP)
[213616.171] (II) intel(0): EDID vendor "CPT", prod id 1220
[213616.171] (II) intel(0): Printing DDC gathered Modelines:
[213616.171] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 1200  600 603 609 625 -hsync -vsync (37.5 kHz eP)

The reason this doesn't seem helpful, is that it appears to be working.

I've scoured the Internets, but I can't seem to find relevant discussions that go anywhere. Any suggestions are greatly appreciated.

p.s. I'm not sure if this is the correct section... Hopefully it is.

Last edited by bdjnk (2012-05-09 18:11:43)

bdjnk · 2012-05-25 19:29:11

I'm bumping this because I'm still completely at a lose.

I did try this advice from the wiki:

$ cvt 1920 1080
# 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
$ xrandr --newmode "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
$ xrandr --addmode VGA1 "1920x1080_60.00"
$ xrandr --output VGA1 --mode "1920x1080_60.00"

but the monitor just displayed an unhelpful "Unsupported signal" message.
At least the is better than "No signal", I hope.

Even a suggestion of something to try or somewhere to look is greatly appreciated. I'm lonely here, all by myself.

Gusar · 2012-05-25 19:40:50

I'm just guessing here, have you tried with *just* the tv? By that I mean add

--output LVDS1 --off

to the xrandr command.

Also, what environment are you running? The 945GME can do opengl only up to 2048x2048. The combined resolution of your screens exceeds that, except if you stack them horizontally.

Last edited by Gusar (2012-05-25 19:56:00)

bdjnk · 2012-05-25 19:55:38

Hey Gusar, I hadn't tried that, but I have now.

First, I made another modeline:

$ cvt --reduced 1920 1080 60
# 1920x1080 59.93 Hz (CVT 2.07M9-R) hsync: 66.59 kHz; pclk: 138.50 MHz
Modeline "1920x1080R"  138.50  1920 1968 2000 2080  1080 1083 1088 1111 +hsync -vsync
$ xrandr --newmode "1920x1080R"  138.50  1920 1968 2000 2080  1080 1083 1088 1111 +hsync -vsync
$ xrandr --addmode VGA1 "1920x1080R"

So here is the current situation:

$ xrandr --output VGA1 --mode "1920x1080" --output LVDS1 --off

gives me: "No signal"

$ xrandr --output VGA1 --mode "1920x1080_60.00" --output LVDS1 --off

and

$ xrandr --output VGA1 --mode "1920x1080R" --output LVDS1 --off

give me: "Unsupported signal"

So, still no good.

As to the environment, I'm not exactly sure what you mean. I am using openbox...

Oh, and the information on this sony support page may be helpful, but I'm not certain.

Last edited by bdjnk (2012-05-25 20:01:15)

Gusar · 2012-05-25 20:04:35

How about, instead of specifying a mode, let xrandr figure it out itself:

xrandr --output VGA1 --auto --output LVDS1 --off

If that won't work, no idea. Your TV is just weird

Edit: About the environment, I was curious if you're running a compositor. But you're running openbox, so no compositor.

Last edited by Gusar (2012-05-25 20:05:56)

bdjnk · 2012-05-25 20:56:44

That just takes me back to the "No signal" message. It is most likely just trying to use the default "1920x1080" modeline. Thanks for the suggestions though.

I had the thought that maybe the TV can't use its highest resolution over VGA, but requires HDMI. I don't have a VGA to HDMI connector to test the theory though.

Gusar · 2012-05-25 21:38:13

I don't see why it couldn't use 1920x1080, VGA is capable of even more than that. The problem is elsewhere, but I have no idea how to find out where. Googling around, there are mentions of people having problems getting 1920x1080 out of VGA, but the problem is rather on the computer side, not on the tv side. It's mostly about Windows, where the configuration gui doesn't even list 1920x1080 as a possibility.

The last idea I have is to try a different cable. Chances of success are low though.

Oh, and VGA to HDMI connectors are impossible. VGA is an analog signal, HDMI a digital one. You need a converter box to, well, convert the analog signal to a digital one. Something like this: http://www.amazon.co.uk/KanaaN-Audio-HD … omputers_3
But if the problem is on the computer side, such a converter won't help.

bdjnk · 2012-05-26 03:05:06

Neither do I, but sometimes hardware is stupid. I agree it's unlikely.

Regarding the cable, I have a monitor at home capable of 1920x1200 (and 1920x1080 of course) which works with my NC10 and I've tested a cable that works with that on the TV. No dice.

I guess I'll resign myself to not getting it to work.

R00KIE · 2012-05-26 17:22:09

You could try gtf instead of cvt, the results are slightly different. Or you could try cvt -r and see if it makes a difference.

You may also have to delve deeper into specifying custom modelines using the values given in page 19 of the users manual.

olive · 2012-05-28 21:19:10

Do the lower resolution works? If it consoles you, I have similar (and strange) problems. My TV obstinately refuses any input from a single computer (that works with other monitors) and accept what should be the same signal (same resolution and refresh rate) from another computer (with a similar, though not exactly the same intel card!). If you have another computer at hand, just try to see what happens

https://bbs.archlinux.org/viewtopic.php?id=141955

Last edited by olive (2012-05-28 21:20:14)

Arch Linux

#1 2012-05-09 18:05:33

No Signal for External Monitor at 1920x1080 with 945GME over VGA

#2 2012-05-25 19:29:11

Re: No Signal for External Monitor at 1920x1080 with 945GME over VGA

#3 2012-05-25 19:40:50

Re: No Signal for External Monitor at 1920x1080 with 945GME over VGA

#4 2012-05-25 19:55:38

Re: No Signal for External Monitor at 1920x1080 with 945GME over VGA

#5 2012-05-25 20:04:35

Re: No Signal for External Monitor at 1920x1080 with 945GME over VGA

#6 2012-05-25 20:56:44

Re: No Signal for External Monitor at 1920x1080 with 945GME over VGA

#7 2012-05-25 21:38:13

Re: No Signal for External Monitor at 1920x1080 with 945GME over VGA

#8 2012-05-26 03:05:06

Re: No Signal for External Monitor at 1920x1080 with 945GME over VGA

#9 2012-05-26 17:22:09

Re: No Signal for External Monitor at 1920x1080 with 945GME over VGA

#10 2012-05-28 21:19:10

Re: No Signal for External Monitor at 1920x1080 with 945GME over VGA

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