Mailinglist Archive: radeonhd (529 mails)

[Luc Verhaegen <libv@xxxxxxxxx>]

On Sat, Dec 15, 2007 at 10:25:17AM +0100, Jerome Quelin wrote:
> On 07/12/15 02:45 +0100, Luc Verhaegen wrote:
> > > > driver works fine at 1280x1024. i get some working display at 1600x1200,
> > > > but screen flickers from time to time, which is annoying - therefore i
> > > > went back to 1280x1024 (using radeonhd for day to day use).
> > >
> > > driver still flickers at 1600x1200.
> [...]
>
> > This is what the monitor says is its preferred mode:
> > > (II) RADEONHD(0): Modeline "1600x1200"x0.0  162.00  1600 1664 1856 2160  
> > > 1200 1201 1204 1250 +hsync +vsync (75.0 kHz)
>
> indeed, my screen's native resolution is 1600x1200
> (and i would prefer sticking with this resolution!)
>
>
> > You should try using a mode with reduced blanking. I have no idea how 
> > that can be achieved easily with RandR. With NoRandR, it is trivial 
> > because you would just state
> > Modes "1600x1200R"
>
> xrandr --output DVI-I_1/digital --mode 1280x1024
> works ok to change my resolution...
>
> but once again, i'd prefer having a non-flickering 1600x1200... do you
> know why it happens? if you need some more information from me, don't
> hesitate...
>
> thanks,
> jerome 

This is not what reduced blanking means.

1600x1200 with normal cvt:

# 1600x1200 59.87 Hz (CVT 1.92M3) hsync: 74.54 kHz; pclk: 161.00 MHz
Modeline "1600x1200_60.00"  161.00  1600 1712 1880 2160  1200 1203 1207 1245 
-hsync +vsync

1600x1200 with cvt -r:

# 1600x1200 59.92 Hz (CVT 1.92M3-R) hsync: 74.01 kHz; pclk: 130.25 MHz
Modeline "1600x1200R"  130.25  1600 1648 1680 1760  1200 1203 1207 1235 +hsync 
-vsync

Notice how the bandwidth/dotclock went down from 161MHz to a much more 
acceptable 130.25 MHz.

When you choose this reduced blanking mode, your monitor will be a lot 
happier, this while displaying the same image at roughly the same 
timing.

Thanks,

Luc Verhaegen.
SUSE/Novell X Driver Developer.
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