External monitor does not work unless connected at boot

Agustin Lobo aloboaleu at gmail.com
Thu May 22 23:26:42 PDT 2008


If I look to the hardware info under winxp, I have
Mobile Intel 945 GM Express Chipset Family
If I do sudo ddcprobe, I get
Intel 82945GM Chipset Family Graphics Accelerated VGA BIOS

But I think that ubuntu hardy uses driver i810 for
intel 945 (don't know how to make sure though)

Should I still try i810switch or am I going to screw up my system?
What did you do to adapt it for the 945 chipset? Also, is this
likely to solve the second problem (very reduced brightness in
the laptop screen when the external display is on)?



Peter Skensved wrote:
>   What video card is in your laptop ? If it is an intel i810 based
> chipset then you may want to google for i810switch . It allows you
> to toggle the external video on or off. I had to hack it slightly 
> to get it to support the 945 chipset but it works for me.
>                                      peter
> ----
> Peter Skensved                          Email : peter at SNO.Phy.QueensU.CA
> Dept. of Physics,                       Phone:  (613) 533-2676
> Queen's University,                     Fax:    (613) 533-6813
> Kingston, Ontario,
> Canada

Original message to xorg:
> Hi!
> I'm running ubuntu hardy on a Toshiba Portege M400
> laptop.
> If I boot the laptop without the external
> monitor, then connect the external monitor
> and set up with urandr (or just xrandr), the external monitor
> does not display anything. Even if I restart
> X using the keyboard (Ctrl Alt <-). The display in the laptop
> behaves as if the external monitor
> were working.
> I have to reboot the laptop with the external monitor
> connected to it in order to get the external monitor working.
> And in this case, the external monitor works fine, but the
> laptop has very low brightness
> Any way to solve these problems?
> Thanks

Dr. Agustin Lobo
Institut de Ciencies de la Terra "Jaume Almera" (CSIC)
LLuis Sole Sabaris s/n
08028 Barcelona
Tel. 34 934095410
Fax. 34 934110012
email: Agustin.Lobo at ija.csic.es

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