From mboxrd@z Thu Jan 1 00:00:00 1970 From: Geert Uytterhoeven Subject: Re: asynchronous resolution change Date: Tue, 25 Nov 2008 09:36:10 +0100 (CET) Message-ID: References: <333fec630811181704t19194e5et6d5299e2305f4401@mail.gmail.com> <333fec630811241752i616754f5wcde88e812a439b01@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sfi-mx-2.v28.ch3.sourceforge.com ([172.29.28.122] helo=mx.sourceforge.net) by h25xhf1.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1L4tPJ-0008Pi-KP for linux-fbdev-devel@lists.sourceforge.net; Tue, 25 Nov 2008 08:36:29 +0000 Received: from wilson.telenet-ops.be ([195.130.132.42]) by 72vjzd1.ch3.sourceforge.com with esmtp (Exim 4.69) id 1L4tPH-00019g-Mt for linux-fbdev-devel@lists.sourceforge.net; Tue, 25 Nov 2008 08:36:29 +0000 In-Reply-To: <333fec630811241752i616754f5wcde88e812a439b01@mail.gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: Jatin Kumar Cc: linux-fbdev-devel@lists.sourceforge.net On Mon, 24 Nov 2008, Jatin Kumar wrote: > On Wed, Nov 19, 2008 at 3:35 AM, Geert Uytterhoeven wrote: > > On Tue, 18 Nov 2008, Jatin Kumar wrote: > > > I am new to linux fb model and had some queries regarding resolution > > change > > > mechanisms. > > > > > > Consider a situation where the frambuffer kernel module (vfb/xenfb etc) > > > wants to change the resolution. > > > > > > 1. Is there a mechanism to this, considering the applications/windowing > > > system/console above the framebuffer hasnt initiated the size change? > > > > > > 2. Is there a way to do an upcall into the application/windowing > > > system/console modules to inform them about the size change > > asynchronously? > > > > > > In this particular case ; the display hardware(instead of the user) has > > > initiated the resolution change.Is it possible in the current fb > > framework > > > to support it? > > > > Yes there is! If the resolution is changed, and the number of columns and > > lines of the console changes, the tty subsystem will send the SIGWINCH > > signal > > to the application, cfr. tty_do_resize() in drivers/char/tty_io.c. > > > > Note that not all applications handle it. E.g. X doesn't, AFAIK. > > Thanks much for the info. > > Is the tty_io_resize( ) relatively new? . tty_do_resize > I am looking at 2.6.18.8 src code (used for xen) and could not find the > function. No, it's older than the frame buffer device framework. If you can't find it, search for SIGWINCH. > Also are there any plans for exposing a similar callback api in the linux fb > model to make the applications stay updated about the underlying > resolution/hardware mode changes? What exactly are you missing that SIGWINCH doesn't provide? Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/