radeon kms, LCD timing info

[Howard Chu]

Alex Deucher wrote:
> On Sat, Oct 31, 2009 at 6:41 PM, Howard Chu <hyc at symas.com> wrote:
>> I have an HP dv5z laptop with HD3450 GPU. It came with a 1680x1050 LCD panel
>> and I'm currently trying to use a 1920x1200 panel instead. The panel that I
>> have seems to work fine as far as booting and text mode goes, but when I start
>> up X I get a black screen. By the way, this is currently running Ubuntu Jaunty
>> but with a self-compiled 2.6.32-rc4 kernel and X stuff from the xorg-edgers
>> ppa, so fairly bleeding edge driver and mesa.
>>
>> Another interesting bit is that with the fbcon driver, the VTs also work fine,
>> and I have 75 rows x 240 columns of text. So it appears that the radeon driver
>> is using acceptable timing parameters at startup, but when the X server starts
>> it switches to a set of timing parameters that don't work.
>>
>> First question: how do I find out what timing parameters are in use at boot,
>> and what's in use by radeon+fbcon?
>>
>> Second question: how do I set the correct timing parameters while X is
>> running? Just playing with modelines doesn't seem to be sufficient. X boots up
>> with several modelines but most of them are defective. E.g., 1920x1080
>> actually displays the desktop instead of just a black screen, but it is
>> shifted right by about an inch, and has a cyclic fade-to-white going on. Many
>> of the other modes do the same thing, and a few (like 640x480) just display black.
>>
>> Any help would be much appreciated, thanks.
> 
> Please post your xorg log and dmesg output.  The driver gets the panel
> timing information from a table in the bios.  With the new panel, the
> driver is probably still getting the old timing from the vbios.

Posted at
  http://highlandsun.com/hyc/dmesg.txt
and
  http://highlandsun.com/hyc/Xorg.0.log

-- 
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/