[Xorg-driver-geode] Identifying custom TFT panels on Geode LX

[Luke McKee]

Hello All,

I have been struggling for a long while to get the display working on
my Kohjinsha E9 Notebook. It's a Geode LX 500Mhz with a 1024x600 TFT
panel. It works in Windows XP.

I have not been able to get the device to work in Linux and I have
scowered the internet for a mode line that will work. I have tried to
use PanelMode option as well, but it appears I need the right specs
for my LCD panel before I proceed.

My question at this time is this, How do I identify my panel? With no
Refersh rate or HorizSync in xorg.conf the system is not identifying
the modes that are supported. I've tried various versions for other
1024x600 display's I've found on the internet and had no joy.

On a Geode how do you do a obtain the EDID data for the TFT Panel?

I will provide any other data on request.

Your support will be appreciated.

Luke


---------- [ Original Message ] ----------
Subject: Kohjinsha E9-Korea(SA5) linux video custom panel support
(to England support)

I forwarded this. It only went to Singapore. Can you please make sure
the support Engineers in Japan get this or provide assistance if you
know how. Most of the Geode based notebooks (SA series) you sell will
have similar problems with Linux. I know that there is many Linux
enthusiasts i the UK and Geode has many performance advantages on
linux (it was originally designed as a thin client system).

---------- [ Original Message ] ----------
Subject: Kohjinsha E9-Korea(SA5) linux video custom panel support

Date: Sat, 16 May 2009 13:04:52 +0900
From: "MCKEELUKELEDGERD" <hojuruku at paran.com>
To: <service at kohjinsha.com.sg>,

Hello Kohjinsha Support (re-circulate worldwide please),

I have owned a E9 now for a while. However I have NEVER got video
working in Linux, which is by far the best operating system for a
Geode when it comes to performance.

Product Page: http://www.kohjinsha.co.kr/notebook/notebook_02.php?s_pseq=245

I have got myself a copy of the AMD vendor (confidential) "AMD Geode™
LX Processor Windows® XP Display Driver Customization Guide"
Publication ID: 40283B .

The information to get the Panel working in Linux, such as the
"Modeline" and Display driver "PanelMode" option is not available, so
the LCD will shutdown and go white. I know the LCD panel provided does
not work at 60HZ and it is non-standard based on the windows inf
driver file records shown below.

To make your TFT panel work in Linux, it needs the same custom
configuration information. The Kohjinsha driver website's
"unsupported" Linux drivers only include the same downloads from AMD,
that is why this doesn't work.

Extract from Windows driver inf:

[LX_SoftwareDeviceSettings]
HKR,, InstalledDisplayDrivers, %REG_MULTI_SZ%, GeodeLX
HKR,, VgaCompatible, %REG_DWORD%, 0
HKR,, MultiFunctionSupported, %REG_DWORD%, 1
HKR,, Compression, %REG_DWORD%, 1
HKR,, FBLinear, %REG_DWORD%, 1
HKR,, DDCEnabled, %REG_DWORD%, 1
HKR,, DDC_GPIOData, %REG_DWORD%, 4
HKR,, DDC_GPIOClock, %REG_DWORD%, 3
HKR,, EnablePanelScale, %REG_DWORD%, 1
HKR,, CustomFileSize, %REG_DWORD%, 0
HKR,, PanelFile, %REG_SZ%, "\SystemRoot\system32\lx_1024x600_custom-7.out"
HKR,, PanelFileSize, %REG_DWORD%, 176
HKR,, PanelEnable, %REG_DWORD%, 1
HKR,, BIOSDetectOutput, %REG_DWORD%, 0
HKR,, PanelInSystem, %REG_DWORD%, 1
HKR,, EnableNon60HzPanel, %REG_DWORD%, 1
HKR,, SimultaneousCRT, %REG_DWORD%, 0


So I know you Kohjinsha is in possession of a file
"lx_1024x600_custom-7.inf" that was used to configure the driver. Can
you please provide me


1) This file OR
2) Full specifications and model name of the TFT panel, or a data
sheet for it OR
3) An xorg.conf file that is known to work.

Note I have been reading there is a recent Linux driver bug with the
CS65535 companion chip that stops DCC /EDID from properly working.