On Monday 08 September 2003 14:29, Glenn A. Serpas Jr. (glenns30@swbell.net)
held forth in comp.os.linux.misc
():

> Madhusudan Singh wrote:
>
>> Hi,
>>
>> I have two different kernel on my machine :
>>
>> 1. 2.4.20-8 (Vanilla kernel shipped with RH 9).
>> 2. 2.4.21 (custom compiled kernel with acpi patch and IRQ's
>> allocated with
>> ACPI).
>>
>> The XF86Config being the same with both, I notice the following
>> behaviour :
>>
>> 1 - > Use of Fn-F7 allows me to switch between external monitor, external
>> monitor+own monitor and own monitor modes, as should be.
>>
>> 2. -> Use of Fn-F7 does nothing. If I boot with external monitor
>> connected, only the external monitor works, otherwise only the laptop's
>> own monitor works.
>>
>>
>> I have heard that the BIOS sets this thing up in some fashion,
>> but since I
>> use ACPI subsystem to assign IRQ's in the 2nd case, I can presumably not
>> use that. Is there some way I could mimic the behaviour of configuration
>> 1 with configuration 2 ?
>>
>> Thanks,
>>
>> MS

>
> I'm currently using an Thinkpad i1200... I can switch between LCD and
> Monitor or both. The only problem is I cannot do it in XWindows. If I
> try,only have the screen is displayed. I have to switch to a text console,
> then hit Fn-F7 .. It switches fine and I can return to XWindows. In
> addition, I can switch while the OS is booting..
>
> As for the bios, mine has three settings. LCD, Monitor and Both. I have
> mine set to both in the BIOS.
>
> Glenn


How do you modify the BIOS settings ? I have an ACPI patch on my custom
kernel.