Problem with replacement display

[Alex Deucher]

On Mon, Nov 8, 2010 at 2:53 PM, Jon Senior <jon at restlesslemon.co.uk> wrote:
> Hi,
>
> I swapped out the LCD panel in my Thinkpad T60 today to resolve a
> backlight issue (pink tint). The new display works fine, X seems to
> detect it OK, but when I plug in my external monitor it all goes wrong.
> When xrandr starts probing, the internal panel loses the picture. The
> backlight remains on, and according to xrandr I should have an image,
> but the screen remains black. xrandr reports the exact same resolutions
> for both displays, although the internal one 1024x768 and the external
> one 1280x1024.  The chip is a Mobility Radeon x1300, the new panel is a
> like-for-like replacement (or as close as they ever get in laptop
> world!). The lines below appear in Xorg.0.log (sadly I don't have a
> backup of a log file pre-dating the upgrade so I can't compare (And I
> don't fancy taking the laptop screen apart again!).
>
> They appear to show that the graphics chip is failing to retrieve the
> EDID information from the internal LCD and using either some internal
> default (with no external device) or the data from the external device
> (when connected).
>
> Any ideas? Any suggestions?

Please file a bug:
https://bugs.freedesktop.org
and attach your full xorg log, config, and dmesg output.

Alex

>
> Jon Senior
>
> -------------
>
> (II) RADEON(0): Output VGA-0 has no monitor section
> (II) RADEON(0): I2C bus "VGA-0" initialized.
> (II) RADEON(0): Output LVDS has no monitor section
> (II) RADEON(0): I2C bus "LVDS" initialized.
> (II) RADEON(0): Output DVI-0 has no monitor section
> (II) RADEON(0): I2C bus "DVI-0" initialized.
> (II) RADEON(0): Port0:
>  XRANDR name: VGA-0
>  Connector: VGA
>  CRT1: INTERNAL_KLDSCP_DAC1
>  DDC reg: 0x7e40
> (II) RADEON(0): Port1:
>  XRANDR name: LVDS
>  Connector: LVDS
>  LCD1: INTERNAL_LVTM1
>  DDC reg: 0x7e40
> (II) RADEON(0): Port2:
>  XRANDR name: DVI-0
>  Connector: DVI-I
>  DFP1: INTERNAL_KLDSCP_TMDS1
>  DDC reg: 0x7e50
> (II) RADEON(0): I2C device "VGA-0:ddc2" registered at address 0xA0.
> Dac detection success
> (II) RADEON(0): Output: VGA-0, Detected Monitor Type: 0
> finished output detect: 0
> (II) RADEON(0): I2C device "LVDS:ddc2" registered at address 0xA0.
> (II) RADEON(0): Output: LVDS, Detected Monitor Type: 2
> finished output detect: 1
> (II) RADEON(0): I2C device "DVI-0:ddc2" registered at address 0xA0.
> (II) RADEON(0): Output: DVI-0, Detected Monitor Type: 0
> Unhandled monitor type 0
> finished output detect: 2
> finished all detect
> before xf86InitialConfiguration
> Dac detection success
>
> -------------
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