[mythtv-users] Mythbuntu defaulting to incorrect resolution

[Jksj]

On 10/10/13 22:43, jmk wrote:
> To add a bit more information… I'm wondering if something changed with
> respect to the DVI output name. Specifically, Xorg.0.log shows my Sharp
> LCD on DFP-0 with 1920x1080 being validated:
>
> ---
> [    15.320] (--) NVIDIA(0): Valid display device(s) on ION at PCI:1:0:0
> [    15.320] (--) NVIDIA(0):     CRT-0
> [    15.320] (--) NVIDIA(0):     SHARP LCD (DFP-0) (connected)
> [    15.320] (--) NVIDIA(0):     DFP-1
> [    15.320] (--) NVIDIA(0): CRT-0: 400.0 MHz maximum pixel clock
> [    15.320] (--) NVIDIA(0): SHARP LCD (DFP-0): 330.0 MHz maximum pixel
> clock
> [    15.320] (--) NVIDIA(0): SHARP LCD (DFP-0): Internal Dual Link TMDS
> [    15.320] (--) NVIDIA(0): DFP-1: 165.0 MHz maximum pixel clock
> [    15.320] (--) NVIDIA(0): DFP-1: Internal Single Link TMDS
> [    15.320] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the
> EDID for display
> [    15.320] (**) NVIDIA(0):     device SHARP LCD (DFP-0) (Using EDID
> frequencies has been
> [    15.320] (**) NVIDIA(0):     enabled on all display devices.)
> [    15.329] (II) NVIDIA(0): Validated MetaModes:
> [    15.329] (II) NVIDIA(0):     "1920x1080+0+0"
> ---
>
> However, it then sets the 1280x1024 resolution on DVI-D-0:
>
> ---
> [    19.268] (II) NVIDIA(0): Setting mode "DVI-D-0: nvidia-auto-select
> @1280x1024 +0+0"
> ---
>
> I can use "xrandr --output DVI-D-0 --mode 1920x1080" to change the
> resolution on the LCD after bootup. Unfortunately, I'm at a loss as to
> why relatively simple xorg.conf isn't doing this for me from the start:
>
> ---
> Section "Device"
>      Identifier     "Device0"
>      Driver         "nvidia"
>      VendorName     "NVIDIA Corporation"
>      BoardName      "ION"
> EndSection
>
> Section "Screen"
>      Identifier     "Screen0"
>      Device         "Device0"
>      Monitor        "Monitor0"
>      DefaultDepth    24
>      Option         "Stereo" "0"
>      Option         "TwinView" "0"
>      Option         "metamodes" "1920x1080 +0+0"
>      SubSection     "Display"
>          Depth       24
>          Modes       "1920x1080"
>      EndSubSection
> EndSection
> ---
>
> Thanks,
> Joe
>
> On Thu, 2013-10-10 at 11:42 -0500, jmk wrote:
>> Hi,
>>
>> I updated my Mythbuntu-based frontend today in preparation to moving to
>> the 0.27 repo. Unfortunately, the system now seems to think I really
>> want my display resolution to be 1280x1024, instead of 1920x1080.
>>
>> I can use nvidia-settings, the xfce4-display-settings or xrandr to
>> successfully correct the resolution, but I'm unable to figure out how to
>> make this stick across reboots. For example, xorg.conf is configured for
>> 1920x1080, and the log file shows it setting the display to that prior
>> to switching to 1280x1024. I've also created an XFCE4 autostart file to
>> call a script with the xrandr command, but either xrandr is silently
>> failing there, or the display is be subsequently reset.
>>
>> Have others run into this? Any fix suggestions?
>>
>> Thanks,
>> Joe
>>
>>
>> _______________________________________________
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>> mythtv-users at mythtv.org
>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>
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I had a similar issue when I took an Ubuntu update last Friday. In that 
case myth was driving the tv at 25hz instead of 50hz. As you report 
setting the correct frequency in Nvidia control panel resolved the 
issue. I made it permanent by adding the following line to the Startup Apps.
nvidia-settings -a 0/CurrentMetaMode="1920x1080_50 @1920x1080 +0+0"
It does not work unless you copy the exact metamode spec (annoyingly it 
fails silently).
This change was not caused by an update to myth, I checked by running 
the latest 0.27 on a 49 day old backup I had of the OS. I suspect an 
update of XBMC 13 did it but cant prove it. Do you have xbmc installed?