Wrong resolution at X

[pascalts]

Hi,

I'm using a raspberry with an 7Inch touchscreen. The touchscreens native resolution is 800x480px.

I tried to edit the /boot/config.txt file as said at elinux - my goal was 1280x768 @ 60Hz - so

Code: Select all

hdmi_group = 2
hdmi_mode = 23

this mode is DEFINETLY SUPPORTED by the screen (tested under Windows and raspBMC), but if I get an image (sometimes just happens nothing and I have to login using ssh), it is a resolution like 1152x864px (so hdmi mode 21...) and it is not possible to change it in LXDE.

So my questions:
Is it possible to force a resolution?
Is it possible to set a new resolution like 800x480px? (Isn't the HDMI-port programmable?)

Pascal

[pascalts]

Er by the way I am now able to do 1280x720 - ok, not bad.

Code: Select all

root@pisces:~# /opt/vc/bin/tvservice -m CEA
Group CEA has 6 modes:
           mode 1: 640x480 @ 60Hz, progressive
           mode 2: 720x480 @ 60Hz, progressive
           mode 3: 720x480 @ 60Hz, progressive
  (native) mode 4: 1280x720 @ 60Hz, progressive
  (native) mode 5: 1920x1080 @ 60Hz, interlaced
           mode 16: 1920x1080 @ 60Hz, progressive
root@pisces:~# /opt/vc/bin/tvservice -m DMT
Group DMT has 5 modes:
           mode 4: 640x480 @ 60Hz, progressive
           mode 16: 1024x768 @ 60Hz, progressive
           mode 35: 1280x1024 @ 60Hz, progressive
           mode 47: 1440x900 @ 60Hz, progressive
           mode 58: 1680x1050 @ 60Hz, progressive
root@pisces:~# /opt/vc/bin/tvservice -s
state 0x12001a, 1280x720 @ 60Hz, progressive

but no idea to reach 800x480px.

framebuffer_width and framebuffer_height do only make the x run at a special resolution, bus the signal goes on at 1280x720px...

[dukla2000]

Well if your screen supports 800*480 it certainly isn't admitting it! In the HDMI thread (I presume you have read as you have run tvservice) I think Gert or Dom gives the code to ignore your screen EDID if you want to try that.

Faster would be to revert to raspBMC and check the config.txt, resulting boot sequence (especially Pi fb setup consequences as reported by dmesg) and X11 consequences (/var/log/Xorg.log) and then try repeat them in Raspbian.

[JeremyF]

hdmi_ignore_edid=0xa5000080

[pascalts]

Thank you, I'll test it soon.

[joshje]

I am also trying to set the display to output at 800x480.

Setting hdmi_ignore_edid=0xa5000080 has let me specify any resolution defined, but 800x480 still isn't an option.

Is there another config file where new resolutions can be defined?

[pascalts]

I heard that the hdmi is programmable... so it might be possible to FORCE this resolution?

someone any ideas?

[abishur]

If you edit the config.txt file located in /boot (you might have to make this file if it doesn't exist), you can add the hdmi_mode modifier to force a specific resolution.

full details on config.txt and the hdmi_mode options can be found here

http://elinux.org/RPi_config.txt

[joshje]

If you edit the config.txt file located in /boot (you might have to make this file if it doesn't exist), you can add the hdmi_mode modifier to force a specific resolution.

full details on config.txt and the hdmi_mode options can be found here

http://elinux.org/RPi_config.txt

I did try this, but 800x480 isn't available as a resolution to set. I'm using 848x480 at the moment, which is close, but still not the right size (so text is blurry).

[pascalts]

If you edit the config.txt file located in /boot (you might have to make this file if it doesn't exist), you can add the hdmi_mode modifier to force a specific resolution.

full details on config.txt and the hdmi_mode options can be found here

http://elinux.org/RPi_config.txt

I did try this, but 800x480 isn't available as a resolution to set. I'm using 848x480 at the moment, which is close, but still not the right size (so text is blurry).

same problem here. 800x480 not reachable. if i use an usual ubuntu x86 installation, 800x480 works, so it is not a problem of the monitor, i think.

[dom]

I heard that the hdmi is programmable... so it might be possible to FORCE this resolution?

someone any ideas?

Can you post your edid.dat (with /opt/vc/bin/tvservice -d edid.dat). You can zip it up and attach it to this thread.
I'd like to see if there is anything in there that indicates 800x480 is supported.

[joshje]

Here's my edid output:
http://pastebin.com/8V6YzYs1

It doesn't specify 800x480 as an option, but definitely does support this resolution. It's also the native resolution of the display.

Should it matter if the resolution is reported by the edid? Surely we should be able to override this and set it to any arbitrary width and height?

[dom]

Here's my edid output:
http://pastebin.com/8V6YzYs1

It doesn't specify 800x480 as an option, but definitely does support this resolution. It's also the native resolution of the display.

Should it matter if the resolution is reported by the edid? Surely we should be able to override this and set it to any arbitrary width and height?

Well, we're looking into better support for non-standard modes. Can you post the binary edid.dat file?

[joshje]

Here's my edid output:
http://pastebin.com/8V6YzYs1

It doesn't specify 800x480 as an option, but definitely does support this resolution. It's also the native resolution of the display.

Should it matter if the resolution is reported by the edid? Surely we should be able to override this and set it to any arbitrary width and height?

Well, we're looking into better support for non-standard modes. Can you post the binary edid.dat file?

That's great to know! Here's my edid.dat file: http://cl.ly/312t3G1X1946

[joshje]

Hey Dom, is there a thread where I can see progress on this?

Thanks

[dom]

Hey Dom, is there a thread where I can see progress on this?

Thanks

rpi_newbie2 is the hdmi guy at Broadcom. He's looking at fuzzy matching first, then generalised timing. You might get some info here:
http://www.raspberrypi.org/phpBB3/viewt ... 01#p146846