Unable to change refresh rate

[jpterj]

I am running OpenSuse 11.0 with the latest stable driver 180.22.

The PC is connected to a full HD Samsung TV via HDMI.
I have defined modes for 1920x1080 at 24, 50 and 60 Hz.

With dynamic twinview activated I can select these refresh rates in nvidia-settings and the Xorg.0.log says that the selected mode has been set:
(II) NVIDIA(0): Setting mode "1920x1080_50"
(II) NVIDIA(0): Setting mode "1920x1080_24"

But the TV and nvidia-settings -q RefreshRate always reports 60 Hz:
jpt@htpc2:~> nvidia-settings -q RefreshRate

Attribute 'RefreshRate' (htpc2:0.0; display device: DFP-0): 60,00 Hz.
'RefreshRate' is an integer attribute.
'RefreshRate' is a read-only attribute.
'RefreshRate' is display device specific.
'RefreshRate' can use the following target types: X Screen, GPU.

jpt@htpc2:~> nvidia-settings -q RefreshRate

Attribute 'RefreshRate' (htpc2:0.0; display device: DFP-0): 60,00 Hz.
'RefreshRate' is an integer attribute.
'RefreshRate' is a read-only attribute.
'RefreshRate' is display device specific.
'RefreshRate' can use the following target types: X Screen, GPU.

jpt@htpc2:~>

With dynamic twinview disabled I can change refresh rate with xrandr with the same result.

Here is the mode validation part from Xorg.0.log:
(--) NVIDIA(0): Connected display device(s) on GeForce 8300 at PCI:2:0:0:
(--) NVIDIA(0): SAMSUNG (DFP-0)
(--) NVIDIA(0): SAMSUNG (DFP-0): 165.0 MHz maximum pixel clock
(--) NVIDIA(0): SAMSUNG (DFP-0): Internal Single Link TMDS
(II) NVIDIA(0): Mode Validation Overrides for SAMSUNG (DFP-0):
(II) NVIDIA(0): AllowNon60HzDFPModes
(II) NVIDIA(0): NoMaxPClkCheck
(II) NVIDIA(0): NoEdidMaxPClkCheck
(WW) NVIDIA(0): The EDID for SAMSUNG (DFP-0) contradicts itself: mode
(WW) NVIDIA(0): "1920x1080" is specified in the EDID; however, the EDID's
(WW) NVIDIA(0): valid VertRefresh range (49.000-71.000 Hz) would exclude
(WW) NVIDIA(0): this mode's VertRefresh (24.0 Hz); ignoring VertRefresh
(WW) NVIDIA(0): check for mode "1920x1080".
(WW) NVIDIA(0): The EDID for SAMSUNG (DFP-0) contradicts itself: mode
(WW) NVIDIA(0): "1920x1080" is specified in the EDID; however, the EDID's
(WW) NVIDIA(0): valid VertRefresh range (49.000-71.000 Hz) would exclude
(WW) NVIDIA(0): this mode's VertRefresh (25.0 Hz); ignoring VertRefresh
(WW) NVIDIA(0): check for mode "1920x1080".
(WW) NVIDIA(0): The EDID for SAMSUNG (DFP-0) contradicts itself: mode
(WW) NVIDIA(0): "1920x1080" is specified in the EDID; however, the EDID's
(WW) NVIDIA(0): valid VertRefresh range (49.000-71.000 Hz) would exclude
(WW) NVIDIA(0): this mode's VertRefresh (30.0 Hz); ignoring VertRefresh
(WW) NVIDIA(0): check for mode "1920x1080".
(WW) NVIDIA(0): The EDID for SAMSUNG (DFP-0) contradicts itself: mode
(WW) NVIDIA(0): "1920x1080" is specified in the EDID; however, the EDID's
(WW) NVIDIA(0): valid VertRefresh range (49.000-71.000 Hz) would exclude
(WW) NVIDIA(0): this mode's VertRefresh (24.0 Hz); ignoring VertRefresh
(WW) NVIDIA(0): check for mode "1920x1080".
(WW) NVIDIA(0): The EDID for SAMSUNG (DFP-0) contradicts itself: mode
(WW) NVIDIA(0): "1920x1080" is specified in the EDID; however, the EDID's
(WW) NVIDIA(0): valid VertRefresh range (49.000-71.000 Hz) would exclude
(WW) NVIDIA(0): this mode's VertRefresh (25.0 Hz); ignoring VertRefresh
(WW) NVIDIA(0): check for mode "1920x1080".
(WW) NVIDIA(0): The EDID for SAMSUNG (DFP-0) contradicts itself: mode
(WW) NVIDIA(0): "1920x1080" is specified in the EDID; however, the EDID's
(WW) NVIDIA(0): valid VertRefresh range (49.000-71.000 Hz) would exclude
(WW) NVIDIA(0): this mode's VertRefresh (30.0 Hz); ignoring VertRefresh
(WW) NVIDIA(0): check for mode "1920x1080".
(II) NVIDIA(0): Assigned Display Device: DFP-0
(II) NVIDIA(0): Validated modes:
(II) NVIDIA(0): "1920x1080_24+0+0"
(II) NVIDIA(0): "1920x1080_50+0+0"
(II) NVIDIA(0): "1920x1080_60+0+0"
(II) NVIDIA(0): Virtual screen size determined to be 1920 x 1080
(**) NVIDIA(0): DPI set to (100, 100); computed from "DPI" X config option

I have tried different xorg.conf settings, from minimal changes to the one generated by Yast2/sax2 to generating it from nvidia-settings without merging anything from the existing xorg.conf.

This is working without any problem with my old PC with a FX5500 card connected to the same TV with a DVI to HDMI adapter using the latest drivers provided in the OpenSuse repository.

I have also tried to switch the PCs between different HDMI connections on the TV with the same result.

Does anyone have any ideas on how to solve this?

[AaronP]

Try disabling the full GPU scaling option in nvidia-settings. You may also need to enable the "ExactModeTimingsDVI" option.

[jpterj]

Originally Posted by AaronP

Try disabling the full GPU scaling option in nvidia-settings. You may also need to enable the "ExactModeTimingsDVI" option.

Thank you for the prompt reply.

Disabling GPU scaling in nvidia-settings did the trick.

Adding Option "FlatPanelProperties" "Scaling = Native" to the device section in xorg.conf seems to work as well.