Re: i915 driver doesn't find all Modelines that nouveau driver finds

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On Mon, Mar 02, 2015 at 03:16:16PM -0500, Brian J. Murrell wrote:
> On Mon, 2015-03-02 at 20:44 +0200, Ville Syrjälä wrote:
> > On Mon, Mar 02, 2015 at 07:07:47PM +0100, Daniel Vetter wrote:
> > > On Mon, Mar 02, 2015 at 11:33:39AM -0500, Brian J. Murrell wrote:
> > > > 
> > > > [   50.508381] [drm:drm_mode_debug_printmodeline] Modeline 27:"1600x1200" 0 202500 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
> > > > [   50.508383] [drm:drm_mode_prune_invalid] Not using 1600x1200 mode 15
> > > > [   50.508385] [drm:drm_mode_debug_printmodeline] Modeline 28:"1600x1200" 0 189000 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
> > > > [   50.508385] [drm:drm_mode_prune_invalid] Not using 1600x1200 mode 15
> > > > [   50.508387] [drm:drm_mode_debug_printmodeline] Modeline 66:"1400x1050" 0 179500 1400 1504 1656 1912 1050 1053 1057 1105 0x40 0x6
> > > > [   50.508388] [drm:drm_mode_prune_invalid] Not using 1400x1050 mode 15
> > > > [   50.508390] [drm:drm_mode_debug_printmodeline] Modeline 71:"1600x1200" 0 175500 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
> > > > [   50.508390] [drm:drm_mode_prune_invalid] Not using 1600x1200 mode 15
> > > > 
> 
> > The <180MHz modes are dropped only due to the +5% we add to account for SSC on
> > FDI. I wonder if we really need that much?
> 
> I guess this would get me the "71" modeline but not the "27" one.  Any
> idea what refresh rate that "71" would be at?  I forget how to do all of
> that video timing math.

175500*1000/2160/1250 = 65

Oh that's an a CRT monitor you have there. Been a while since I've
come across one of those :) 65Hz on a CRT sounds like a good way to
get a headache to me.

-- 
Ville Syrjälä
Intel OTC
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