kernel comand line parameters

[billi...@gmail.com]

I would like to set the screen resolution for the console and also stop console timeout.

From googling I read that I could change uEnv.txt to the following:

optargs=run_hardware_tests quiet video=omapfb:mode720x480@60 consoleblank=0

but this does not work.

The reason I want to change resolution is that the display goes to 1280x720 resolution when the actual physical resolution is 800x480.
This makes it hard to read text on the console.  I don't know who the manufacturers of these displays is trying to kid!

If I can get 800x480 that would be great, but I would be happy with 720x480.  Audio is not used.

edid given below

Many thanks.

root@beaglebone:~# parse-edid /sys/class/drm/card0/card0-HDMI-A-1/edid
parse-edid: parse-edid version 2.0.0
parse-edid: EDID checksum passed.

        # EDID version 1 revision 3
Section "Monitor"
        # Block type: 2:0 3:fd
        # Block type: 2:0 3:fc
        Identifier "32V3H-H6A"
        VendorName "RTK"
        ModelName "32V3H-H6A"
        # Block type: 2:0 3:fd
        HorizSync 24-60
        VertRefresh 50-75
        # Max dot clock (video bandwidth) 110 MHz
        # Block type: 2:0 3:fc                                                                     
        # DPMS capabilities: Active off:no  Suspend:no  Standby:yes                                
                                                                                                   
        Mode    "1280x720"      # vfreq 60.000Hz, hfreq 45.000kHz                                  
                DotClock        74.250000                                                          
                HTimings        1280 1390 1430 1650                                                
                VTimings        720 725 730 750                                                    
                Flags   "+HSync" "+VSync"                                                          
        EndMode                                                                                    
        Mode    "720x480"       # vfreq 59.940Hz, hfreq 31.469kHz                                  
                DotClock        27.000000                                                          
                HTimings        720 736 798 858                                                    
                VTimings        480 489 495 525                                                    
                Flags   "-HSync" "-VSync"                                                          
        EndMode                                                                                    
        # Block type: 2:0 3:fd                                                                     
        # Block type: 2:0 3:fc                                                                     
EndSection                                                                                         

[Gerald Coley]

The optargs only work on the initial boot splash screen. I know of no way to force a resolution. I have asked for a way, but have yet to see anything work.

Gerald

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[Robert Nelson]

On Wed, Jul 10, 2013 at 5:47 PM, <billi...@gmail.com> wrote:

> I would like to set the screen resolution for the console and also stop
> console timeout.
>
> From googling I read that I could change uEnv.txt to the following:
>
> optargs=run_hardware_tests quiet video=omapfb:mode720x480@60 consoleblank=0
>
> but this does not work.

Well based on your video parameter, yes that 'should not' work..

omapfb!=hardware on the bone..

If you want 720x480 use:
video=HDMI-A-1:720x480@60

and then specify 720x480 in your xorg.conf when using the xorg
modesetting driver..

Regards,

--
Robert Nelson
http://www.rcn-ee.com/

[Robert Nelson]

Or you can also force it to 720x480 via xrandr.. (using the
modesetting driver again)

xrandr --output HDMI-0 --mode 720x480 --rate 60

[billiumbuck]

Thanks for the answers.

I tried video=HDMI-A-1:720x480@60  and just video=640x480@60 and neither worked.

I would like to run without X ... just one QT app running, but not being able to set the kernel command line parameters is quite crippling.

[Charles Steinkuehler]

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Hash: SHA1

On 7/11/2013 5:49 PM, billiumbuck wrote:
>
> Thanks for the answers.
>
> I tried video=HDMI-A-1:720x480@60 and just video=640x480@60 and
> neither worked.
>
> I would like to run without X ... just one QT app running, but not
> being able to set the kernel command line parameters is quite
> crippling.

Check in /proc/cmdline to make sure your arguments are being passed to
the kernel.

The default Angstrom images have several copies of uEnv.txt floating
around, apparently just to confuse people. :)

The uEnv.txt file you need to edit is the one on the FAT file system,
which is the first partition on the eMMC. If you edit one of the
other copies, it won't do anything and your changes won't show up in
/proc/cmdline once booted.

If you see your command line argument in /proc/cmdline and the system
is not behaving the way you want, there is probably something wrong
with the argument you are passing.

- --
Charles Steinkuehler
cha...@steinkuehler.net
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