linux-kernel - Re: KMS + fb + FBIOPUT

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Date:	Tue, 28 Apr 2009 23:57:23 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Peter Hanzel" <hanzelpeter@...il.com>
Cc:	<linux-kernel@...r.kernel.org>,
	<linux-fbdev-devel@...ts.sourceforge.net>,
	dri-devel@...ts.sourceforge.net
Subject: Re: KMS + fb + FBIOPUT_VSCREENINFO

(cc dri-devel)

On Tue, 28 Apr 2009 10:32:34 +0200 "Peter Hanzel" <hanzelpeter@...il.com> wrote:

> Hello.
> 
> I have tried DRM with intel KMS and it is workiing. I am using only 
> framebuffer console.
> Fbcon initializes 1280x800 mode and it works like a charm.
> 
> But when I try to call FBIOPUT_VSCREENINFO on /dev/fb0, it always returns 
> EINVAL,
> I have checked drivers/gpu/drm/i915/intel_fb.c
> and found that
> 
> intelfb_check_var        returns -EINVAL     if (var->pixclock == -1 || 
> !var->pixclock)
> intelfb_set_par             returns -EINVAL    if (var->pixclock != -1) { 
> DRM_ERROR("PIXEL CLCOK SET\n");  return
> 
> So the FBIOPUT_VSCREENINFO always fails.
> 
> So is the change of resolution not supported through FBIOPUT_VSCREENINFO 
> call?
> 

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