#677 EDID-less panels

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opened 1 year ago by swiftgeek · 2 comments

Instead of EDID, VPD block 12 is used in such configuration

intel_vbt_decode OPROM0.ROM --block=12

Affected confirmed devices (and panels)

  • X60 Tablet (Dali-1)
    • HT12X21-351

TODO:

  • Check difference between following states on GMBUS and implement debug messages in libgfxinit
    • 24xx with valid EDID
    • Nothing connected (ie. state where cable is disconnected on any output)
    • DDC lines shorted to GND (as seen on at least one EDID-less panel)
  • Additionally/Alternatively -LCD_PRESENCE signal can be used to make sure that at least the LCD cable is connected. (compare with LCD bridge on caramel-1!)
Instead of EDID, VPD block 12 is used in such configuration `intel_vbt_decode OPROM0.ROM --block=12` Affected confirmed devices (and panels) * X60 Tablet (Dali-1) * HT12X21-351 * DDC lines are shorted to GND - datasheet documents that on page 11 * [LCD Panel Datasheet](https://www.beyondinfinite.com/lcd/Library/Hyundai/HT12X21-351.pdf) TODO: * Check difference between following states on GMBUS and implement debug messages in libgfxinit * 24xx with valid EDID * Nothing connected (ie. state where cable is disconnected on any output) * DDC lines shorted to GND (as seen on at least one EDID-less panel) * Additionally/Alternatively -LCD_PRESENCE signal can be used to make sure that at least the LCD cable is connected. (compare with LCD bridge on caramel-1!)
Swift Geek commented 3 months ago
Collaborator

The only relevant information is whether it has EDID or not, please don't write anything else

The only relevant information is whether it has EDID or not, please don't write anything else

Samsung LTN154X3-L0A (15.4" 1280x800) has EDID.

Samsung LTN154X3-L0A (15.4" 1280x800) has EDID.
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