From: Daniel Vetter <daniel@ffwll.ch>
To: "guo.tang" <guo.tang@sonoartis.com>
Cc: intel-gfx <intel-gfx@lists.freedesktop.org>
Subject: Re: Questions about tripple display
Date: Fri, 13 Jul 2012 18:10:35 +0200 [thread overview]
Message-ID: <CAKMK7uHuS6Me0kBQ_RvUycA+ZGaWOoezAA1apc8Ji+kzu4-Z_Q@mail.gmail.com> (raw)
In-Reply-To: <201207130859149921639@sonoartis.com>
On Fri, Jul 13, 2012 at 5:59 PM, Guo Tang <guo.tang@sonoartis.com> wrote:
> Hi,
> Greetings!
>
> I have a system with GM 45 chip set. I want to have 3 displays: LVDS, VGA,
> and TV output. There is no need for
> them to show different contents. So only clone display is required. From GM
> 45 chip set spec, looks like only 2
> display ports can be active at the same time. Is it possible to modify
> driver to get 3 clone displays? Any suggestion
> to where in the driver/Kernel I can poke around would be appreciated.
This does not work, because both LVDS and TV run on a fixed clock
(which does not necessarily agree with the dotclock of the mode),
hence you can't clone them. At least not in all cases, and imo trying
to support such a configuration in more cases is wasted effort. If you
need to drive that many outputs, you're not in the market of a low-end
igd solution like gm45 imho.
Cheers, Daniel
--
Daniel Vetter
daniel.vetter@ffwll.ch - +41 (0) 79 364 57 48 - http://blog.ffwll.ch
next prev parent reply other threads:[~2012-07-13 16:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-13 15:59 Questions about tripple display Guo Tang
2012-07-13 16:10 ` Daniel Vetter [this message]
2012-07-13 16:36 ` Guo Tang
2012-07-13 16:38 ` Daniel Vetter
2012-07-13 16:44 ` Guo Tang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAKMK7uHuS6Me0kBQ_RvUycA+ZGaWOoezAA1apc8Ji+kzu4-Z_Q@mail.gmail.com \
--to=daniel@ffwll.ch \
--cc=guo.tang@sonoartis.com \
--cc=intel-gfx@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.