On most screens there is also a fuse on the LED-panel, probably hidden under the DO NOT TOUCH stuff.Note 2 : If the PWM duty ratio(min) is set between 5% to 1%，the PWM input frequency should be set below
1KHz . The brightness-duty characteristic might not be able to keep in it’s linearity if the dimming control is
operated in 1% to 5% range.
The problem is not in the backlight circuit itself. BIOS can't use dual monitor configuration, thus there's no backlight enable and dim signals for default built-in LCD.RealBlackStuff wrote:Would this remark on the AUO Datasheet help?On most screens there is also a fuse on the LED-panel, probably hidden under the DO NOT TOUCH stuff.Note 2 : If the PWM duty ratio(min) is set between 5% to 1%，the PWM input frequency should be set below
1KHz . The brightness-duty characteristic might not be able to keep in it’s linearity if the dimming control is
operated in 1% to 5% range.
Did you also check the fuses F3 and F4 near the LCD-connector?
I hope it would require only 8-9 soldering points, all on docking port connector pads. Like here (see round pads on top of the red board):Also, how much soldering is needed? it seems like just two wires need to be soldered in, seems easy enough.
Both. They have same pinout of LCD and docking connectors, so the adapter would work with both models.RealBlackStuff wrote:Are you talking X220 or X230?
Nice!nitrocaster wrote:So, basically, it's gonna be a replacement for chinese mod kit. Hope to get a production version soon
No party for tablets. At least, in the first batch and until I get one of these.wabamad wrote:I need this......
Cool! How did you make brightness control work?nitrocaster wrote:Another update: new prototype supports brightness control.
I hope this will work with X230, any insight?nitrocaster wrote:Backlight control is provided by LVDS output. The problem with the previous prototype was that backlight either didn't work in bios or was enabled all the time. Now it's fixed at 100% level in BIOS and works as expected in Windows. BIOS mod is required to disable LVDS output so that it would be single display mode instead of duplication mode.
I suppose the price would be around 60 bucks. Don't know shipping costs yet.
Is it possible to get that mod bios somewhere?nitrocaster wrote:BIOS mod is required to disable LVDS output so that it would be single display mode instead of duplication mode. I suppose the price would be around 60 bucks. Don't know shipping costs yet.
BIOS mod would be ideal, but bear in mind that at least on Linux there's a small patch for the gfx driver that disables LVDS permanently (to save power) and grants backlight control to the eDP lane. http://pastebin.com/WF6wdfpbnitrocaster wrote:BIOS mod is required to disable LVDS output so that it would be single display mode instead of duplication mode
Sure. It's just not a universal solution.harryK wrote:BIOS mod would be ideal, but bear in mind that at least on Linux there's a small patch for the gfx driver that disables LVDS permanently (to save power) and grants backlight control to the eDP lane. http://pastebin.com/WF6wdfpb
. Seems great so far.I haven't yet tried to find this driver, but can confirm that this issue is present on X220. That's the case when Linux users are really happyI was encountered with this trouble as many other people who holds the x230 laptop. However, x220 series will not be affected if it uses a modified driver provided by the inventor of the adapter. This bug will cause a 16-bit-like color output on the screen panel, such that the gradual change of one color will not be so smooth as it was. If anyone remember the 16-bit color depth on the earlier LCD panels, that’s the feel. The root of this bug lies in the display driver, but no solutions has been ever given till now.
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