Mailinglist Archive: radeonhd (529 mails)

[Jerome Quelin <jquelin@xxxxxxxxx>]

On 07/12/17 23:12 +0100, Luc Verhaegen wrote:
> > > 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...
>
> This is not what reduced blanking means.

oh, sorry. i don't know that much of x stuff.


> 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.

ok. i tried cvt -r 1600 1200 which indeeds reduces to 130MHz:
$ cvt -r 1600 1200
# 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

however, the flickering still happens... maybe less intensly, but still
very incomfortable to use. :-(

any other idea?
(going back to 1280x1024)

thanks,
jérôme 
-- 
jquelin@xxxxxxxxx
-- 
To unsubscribe, e-mail: radeonhd+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: radeonhd+help@xxxxxxxxxxxx