Re: Problem with dual display
From: Madhusudan Singh (spammers-go-here_at_nowhere.now)
Date: 12/25/03
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Date: Thu, 25 Dec 2003 17:54:34 -0500
On Mon, 22 Dec 2003 12:42:32 +0200, Sarlac II wrote:
> kegwasher wrote:
>> Madhusudan Singh wrote:
>>
>>
>>>I have posed this question before, but was unable to elicit more than one
>>>response which turned out to be unhelpful.
>>>
>>>Excerpts from my XF86Config :
>>>
>>>
>>>Section "Device"
>>> Identifier "Videocard0"
>>> Driver "trident"
>>> VendorName "Videocard vendor"
>>> BoardName "Trident CyberBlade/Ai1"
>>> Option "intern_disp"
>>> Option "extern_disp"
>>> Option "xinerama"
>>> Option "Display" "Dual"
>>> #Option "crt_screen"
>>>EndSection
>>>
>>>The problem I have is that if I boot up connected with external projector
>>>and then use Fn+F7 (my laptop is an IBM TP i1300), everything is fine.
> When you do it this way, the graphics output is properly initialised
> because of the presence of a working device... I'm not sure how you go
> about firing up the display after booting. You'll have to ask around for
> that. Try the XFree newsgroups?
>>>
>>>If not, no amount of post boot Fn+F7 pressing puts any signal through. I
>>>have lived with this situation for months now but at a recent conference,
>>>this was rather annoying.
>>>
>>>Restarting the X server does not help.
> It won't... restarting X does not rescan the video outputs/devices. So
> the ouput/card that is off will stay off.
>
> Moving : ctrl+alt+f1 before fn+f7
>>>and then moving back to ctrl+alt+f7 does not help either. I do see some
>>>kind of raster flash go across the screen when I do that, but no image
>>>results.
>>>
>>>How do I fix this problem ?
>>
>>
>> I have the same graphic chip in a toshiba and have not seen this problem.
>> My Device section does not have anything about internal or external
>> display. I plugged in at a presentation and was surprised to see that
>> pressing the hotkey to enable the external just worked. To me and IANAE it
>> looks like you are trying to use xinerama. I think all that does is make
>> one large display area.
> xinerama is for combining displays, so that a number of separate
> monitors can be treated as one single, big desktop. If you only have the
> second display some of the time, then xinerama will just mess things up.
> I haven't used xinerama much, I prefer to have "separate" displays.
>
> I think that the only solution for now is to ensure that you boot with
> the projector installed... it might make for a delay at the beginning of
> your presentation, but at least the display will initialise properly. I
> have had the same problem with my dual displays. The second monitor is
> sometimes used on a test machine on my other bench (for serial logging
> etc.) and I have to reboot when I reconnect it, if it was missing at the
> last boot. I haven't looked too carefully for a tool to wake-up and
> initialise displays post boot, but there *must* be one?! Post a response
> if you find one before me!
Thanks for the suggestions. I have now also set the NG list to include
comp.os.linux.x
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