Multimonitor Support in VESA Driver

[Alex Deucher]

On Tue, Jul 15, 2008 at 11:36 AM, Deepak Bhatia
<deepak.bhatia at nechclst.in> wrote:
> Hi Alex,
>
>
>
> Thanks for your detailed reply.
>
>
>
> First point, we are bound to use X11R7.1 and also Vesa Driver on the same.
>

that limits your options unfortunately.

>
>
> Second point, we have been told that VESA driver doesn't support
> multimonitor.
>

That is correct.  It does not support multi-monitor.

>
>
> Question: Does this mean that in case we use VESA driver in xorg.conf file,
> with xinerama enabled, we will not get Multimonitor ?
>

That is correct.  You cannot use vesa for multi-monitor.  xinerama is
irrelevant.

Alex

>
>
> Thanks in advance
>
>
>
> Deepak Bhatia
>
>
>
> -----Original Message-----
> From: Alex Deucher [mailto:alexdeucher at gmail.com]
> Sent: Tuesday, July 15, 2008 7:28 PM
> To: Deepak Bhatia
> Subject: Re: Multimonitor Support in VESA Driver
>
>
>
> On Tue, Jul 15, 2008 at 2:40 AM, Deepak Bhatia
>
> <deepak.bhatia at nechclst.in> wrote:
>
>> Hi Alex
>
>>
>
>> As per X11R7.1, we have to enable Xinerama to achieve the multimonitor
>> using specific driver of the hardware display card present.
>
>>
>
>>
>
>>
>
>> But as per earlier mails, the driver need to have multimonitor
>> capababilities, so we are no sure what is the role of the xinerama?
>
>>
>
>
>
> Xinerama just provides the means to treat multiple X screens as a single
> logical screen.
>
>
>
>>
>
>> Also in X11R7.3, the xrandr1.2 has replaced xinerama to achieve the
>
>> multimonitor functionality. Then we are not sure of the role of drivers to
>
>> achieve the same?
>
>>
>
>
>
> xrandr did not replace xinerama, both are available, it's just that
>
> the intel driver no longer supports zaphod mode. zaphod mode treats
>
> each head as a separate X screen (the driver loads twice, once for
>
> each head).  If you have multiple X screens, you can use xinerama to
>
> merge them into a single logical screen.  Not that xinerama has some
>
> limitations: the dri is not available, so no hardware accelerated 3D,
>
> not dynamic output switching.
>
>
>
>>
>
>>
>
>> I hope you understand my question. I have not put my question to Xorg
>
>> community because as my mails are going through the moderator (which I
>
>> believe is very tough decision on Xorg).
>
>
>
> You have to subscribe to post to the list.
>
>
>
> I've been following your questions, and as I understand it, I think
>
> you'll either need to upgrade your xserver and use randr, or do some
>
> driver work to get zaphod mode working on the intel driver.
>
>
>
> Alex
>
>
>
>>
>
>>
>
>>
>
>> Best Regards
>
>>
>
>>
>
>>
>
>> Deepak Bhatia
>
>>
>
>>
>
>>
>
>> -----Original Message-----
>
>> From: xorg-bounces at lists.freedesktop.org
>
>> [mailto:xorg-bounces at lists.freedesktop.org] On Behalf Of Alex Deucher
>
>> Sent: Thursday, July 10, 2008 7:47 PM
>
>> To: DEEPAK BHATIA
>
>> Cc: xorg at lists.freedesktop.org
>
>> Subject: Re: Multimonitor Support in VESA Driver
>
>>
>
>>
>
>>
>
>> On Thu, Jul 10, 2008 at 1:33 AM, DEEPAK BHATIA <toreachdeepak at gmail.com>
>
>> wrote:
>
>>
>
>>> Hi,
>
>>
>
>>>
>
>>
>
>>> We are currently evaluating the VESA Driver for Multimonitor support
>
>>
>
>>> on Intel 915GM/GMS, 910GML Express Chipset.
>
>>
>
>>>
>
>>
>
>>> Kindly let us know if we can have dual head capababilities using VESA
>
>>
>
>>> Driver. But we are using X11R7.1 platform and not X11R7.3.
>
>>
>
>>
>
>>
>
>> In theory you can setup dualhead with vbe, but I don't know how many
>
>>
>
>> vendors actually implement it and the current xorg vesa driver doesn't
>
>>
>
>> support it AFAIK.
>
>>
>
>>
>
>>
>
>> Alex
>
>>
>
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