[Openchrome-users] VGA output is disable

[Xavier Bachelot]

Hi Filip,

On 08/01/2012 11:18 AM, Filip Dvo??k wrote:
> 
> Hello,
> 
> I have been trying to use openchrome with longer cabel (5 metres).
> The problem is that randr don`t see the monitor.
> Cable is OK. I have tried 3 laptops and VESA driver.
> I can not use VESA becouse VESA don`t know resolution 1366x768.
>
I'm not sure to fully understand what you tried, so I have a few questions.
Are the other laptops all using openchrome ?
Did this setup work with any of the other laptops ?
Does this setup works with a standard length VGA cable ?
Also, the resolution looks weird. Are you sure the native resolution of
your external screen is 1366x768 ? It looks like a laptop's screen
resolution.

> It`s also impossible to open CRT(VGA) output without monitor.
> 
> 
> The last lines in logs are:
> [    18.967] (II) CHROME(0): ViaDisplayEnableCRT
> [    21.514] (II) CHROME(0): ViaDisplayDisableCRT
> [    23.456] (II) CHROME(0): ViaDisplayDisableCRT
> 
> My question is it possible to switch on CRT manually?
> 
A quick search on the net turned out that it should be possible to do
that by manually adding a mode to the output. Something like that :

$ xrandr --addmode VGA1 1366x768
xrandr --output VGA1 --mode 1366x768

Possibly you might also need to add a modeline before doing the above :
$ gtf 1366 768 60

  # 1368x768 @ 60.00 Hz (GTF) hsync: 47.70 kHz; pclk: 85.86 MHz
  Modeline "1368x768_60.00"  85.86  1368 1440 1584 1800  768 769 772 795
 -HSync +Vsync

$ xrandr --newmode 1366x768 85.86  1368 1440 1584 1800  768 769 772 795
 -HSync +Vsync


Never tried that myself, so your mileage may vary...

Regards,
Xavier