linux-kernel - Re: [Linux-fbdev-devel] [PATCH] fbdev: find mode with highest refresh rate in fb_find

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Message-ID: <20070826190913.GA24286@spock.one.pl>
Date:	Sun, 26 Aug 2007 21:09:13 +0200
From:	Michal Januszewski <spock@...too.org>
To:	"Antonino A. Daplas" <adaplas@...il.com>
Cc:	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Ondrej Zajicek <santiago@...reenet.org>
Subject: Re: [Linux-fbdev-devel] [PATCH] fbdev: find mode with highest
	refresh rate in fb_find_mode()

On Wed, Jul 18, 2007 at 11:18:15PM +0800, Antonino A. Daplas wrote:

> > > Currently if the refresh rate is not specified fb_find_mode() returns
> > > the first known video mode with the requested resoluion, which provides
> > > no guarantees wrt the refresh rate.  Change this so that the mode with
> > > the highest refresh rate is returned instead.
> > 
> > What refresh rate it sets when used on card or monitor without DDC?
>
> Yes, I noted this also while reviewing patches.  fb_find_mode() is used
> predominantly with the 'generic' modedb which contains modes that are
> not specific to the card or monitor.  And fb_try_mode() is not a
> guarantee that the returned refresh rate will be safe (we have a lot of
> drivers that do not check the timings against the display capabilities).
> 
> It would be best that fb_find_mode() return the safest refresh rate
> (60Hz) instead of the highest.

How about modifying it so that it looks for a mode with the highest
refresh rate if either a non-generic modedb is used or
info.monspecs.{vfmin,vfmax,hfmin,hfmax,dclkmax} are all non-zero,
and for a mode with refresh rate closest to 60 Hz otherwise?

I'm sorry for the delayed reply.

Best regards.
-- 
Michal Januszewski                              JID: spock@...gentoo.org
Gentoo Linux Developer                    http://people.gentoo.org/spock

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