Archive for 18 febrero 2019

Testing GNU/Linux live cds on HP 250 G6 2SX60EA

febrero 18, 2019

These are some live cds that I tested in an HP 250 G6 2SX60EA laptop and their simple results:

  • Rescatux 0.51b3: Show “Progress linux” prompt. This CLI mode does not let me log in with Debian Live default user and password.
  • Rescatux 0.62b1 (This is a private release, not a public one): Show “Progress linux” prompt. This CLI mode does not let me log in with Debian Live default user and password.
  • debian-live-9.7.0-amd64-gnome.iso: Show “Progress linux” prompt. This CLI mode does not let me log in with Debian Live default user and password.
  • debian-live-testing-amd64-gnome.iso: Graphical desktop but without wifi.
  • ubuntu-18.10-desktop-amd64.iso: Graphical desktop and wifi.
  • debian-live-testing-amd64-gnome+nonfree.iso: Graphical desktop and wifi.

The next batch of tests were done using Super Grub2 Disk 2.02s10 and trying to boot into all the OSes available on the system as it comes from the factory.

  • Boots into FreeDOS ok when booted in BIOS mode.
  • It is not able to boot HPDOCS (that’s normal because it is started from a syslinux.cfg file).

Xorg fix for Grunding Cinaro

febrero 11, 2019

I have a Grunding Cinaro. It is a quite old television that happens to have an HDMI input. I think it’s a 576p or 720p HDMI input.

The specific Grunding model is: GRUNDING Cinaro 32 LXW 82-6612 REF .

Anyways the specific fix is not HDMI but for its VGA input.

This television has a PC source input which enables you to connect an VGA cable plus a 3.5 mm audio jack into it.

 

I have an small PC which I connect thanks to VGA to it.

The 1024×768 mode seem to work fine.

 

The 1280×720 mode at 60  Hz which would match some high quality output does not work ok.

The screen happens to moved to the right or the left and you miss part of your PC desktop on your television output.

 

As far as I concluded this comes from a wrong EDID announcement.

It seems that when a PC is connected to a device which offers a VGA port then the device announces the different modes with its sizes, resolutions, positions, etc.

And this announcement uses the EDID standard.

 

Well, let’s check what wikipedia says about EDID.

Extended Display Identification Data (EDID) is a metadata format for display devices to describe their capabilities to a video source (e.g. graphics card or set-top box). The data format is defined by a standard published by the Video Electronics Standards Association (VESA).

The EDID data structure includes manufacturer name and serial number, product type, phosphor or filter type, timings supported by the display, display size, luminance data and (for digital displays only) pixel mapping data.

 

So, now, you know.

How do you fix your output to use Grunding Cinaro to its full potential from its VGA port?

 

Here there is an script that it is run once I log in to my desktop.

#!/bin/bash                                                                                                                                                                                                                                                                             
# 60 Hz                                                                                                                                                                                                                                                                                    
xrandr --newmode "1280x720_60.00" 74.48  1280 1336 1472 1664  720 721 724 746  -HSync +Vsync
xrandr --addmode VGA-1 1280x720_60.00
xrandr --output VGA-1 --mode 1280x720_60.00
# 75 Hz
#xrandr --newmode "1280x720_75.00" 95.65  1280 1352 1488 1696  720 721 724 752  -HSync +Vsync
#xrandr --addmode VGA-1 1280x720_75.00
#xrandr --output VGA-1 --mode 1280x720_75.00

 

As you might guess 1280×720 at 75Hz does not work so well. 1280×720 at 60Hz is fine for me.

 

Enjoy!