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Widescreen Brightness

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It’s the memory in the nav computer becoming corrupted. It’ll eventually start forgetting last destinations and the address book. Siemens VDO in Germany can repair it.

 

they did mine a couple of years ago and it’s been working perfectly since. At around £80 it’s much cheaper and quicker than mucking about with the ibus etc

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39 minutes ago, velvetmonkey said:

It’s the memory in the nav computer becoming corrupted. It’ll eventually start forgetting last destinations and the address book. Siemens VDO in Germany can repair it.

 

they did mine a couple of years ago and it’s been working perfectly since. At around £80 it’s much cheaper and quicker than mucking about with the ibus etc

So it didn't retain the brightness setting previously, but now it permanently retains it?

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8 hours ago, chalky said:

Yeah pretty much same situation as me then.  Is yours a retro-fit screen like mine?  Do you reckon anyone out there has a car that retains the brightness setting, let’s say overnight?  I’m thinking about building a cheap wee microcontroller circuit to inject the max brightness message onto the iBus. 

My screen is original but the MkIV is a retrofit.  I tried swapping the MkIV over from my E46 M3 but the problem stayed with the car.  I do have an Intravee though.. I wonder if Richard could add an option in the Intravee to override the brightness setting.

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When changing the brightness slider in the Settings menu, the Nav sends the following messages

 

3B 06 F0 05 41 01 bb cs

3B 06 F0 05 42 01 bb cs

 

Where bb is the brightness and cs is the message checksum.

 

So, try sending these using the 'is' command, they should set about 72% brightness.

 

is 3B 06 F0 05 41 01 48 C0

is 3B 06 F0 05 42 01 48 C3

 

If those work, the Intravee could set the brightness directly, or maybe use one of the light sensor values to adjust it automatically.  There may be some extra checking to re-set the brightness whenever the Nav tries to set it, that might cause the monitor to flicker.

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12 hours ago, chalky said:

So it didn't retain the brightness setting previously, but now it permanently retains it?

 

It wasn’t retaining anything before, not even the position of the car before turning it off. Now it’s fine

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13 hours ago, velvetmonkey said:

It’s the memory in the nav computer becoming corrupted. It’ll eventually start forgetting last destinations and the address book. 

If that's the case, why did I still have the problem when I put a known good MkIV in my M5?

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8 hours ago, BarryM said:

My screen works fine but I did see you can replace the LCD for <£100 so that might be an option.

Yeah I tried that, didn’t make any different to the poor brightness I have.  Others might have different experiences if different cause. 

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On 12/21/2017 at 9:05 AM, RichardP said:

When changing the brightness slider in the Settings menu, the Nav sends the following messages

 

3B 06 F0 05 41 01 bb cs

3B 06 F0 05 42 01 bb cs

 

Where bb is the brightness and cs is the message checksum.

 

So, try sending these using the 'is' command, they should set about 72% brightness.

 

is 3B 06 F0 05 41 01 48 C0

is 3B 06 F0 05 42 01 48 C3

 

If those work, the Intravee could set the brightness directly, or maybe use one of the light sensor values to adjust it automatically.  There may be some extra checking to re-set the brightness whenever the Nav tries to set it, that might cause the monitor to flicker.

Would this be done by plugging a computer into the Intravee via the serial port and using the Intravee downloader program?  I have to admit I am not fully up to speed on all of the capabilities of the Intravee (there are so many!), but I found the section in the User Guide about setting the UI mode with a PC and figured this might be a similar process?

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Yes.  Connect up your PC and run the downloader program as if you were going to update the firmware, then type those commands into the console part of the downloader (the large white area below the menu).  You can also use cut and paste, but DON'T use 'Ctrl+V' to paste, right click and select Paste.  Complete the command by pressing the 'Return' or 'Enter' key.

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7 hours ago, RichardP said:

Yes.  Connect up your PC and run the downloader program as if you were going to update the firmware, then type those commands into the console part of the downloader (the large white area below the menu).  You can also use cut and paste, but DON'T use 'Ctrl+V' to paste, right click and select Paste.  Complete the command by pressing the 'Return' or 'Enter' key.

Both of those commands increased the brightness.  I wasn't sure if I was supposed to enter them both at once or individually, so I just entered one at a time, resetting the brightness with the knob on the monitor in between.

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OK, so it's possible to set the monitor brightness.

 

There are a couple of possible issues, for example what happens when the lights are turned on, does the monitor still respect the dimmer control?  In my various iBus logs I can't see any instance of these messages being sent from the Nav to the monitor on initialisation, so either some other mechanism is used or the monitor is supposed to remember the brightness itself.

 

I would propose that the Intravee could grab the set dimmer value from the brightness messages sent when the slider is changed, then send that value at some point during the initialisation process, probably shortly after the monitor announces itself on the iBus after power up, but it may need to be later than that, maybe ignition on.

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3 hours ago, RichardP said:

OK, so it's possible to set the monitor brightness.

 

There are a couple of possible issues, for example what happens when the lights are turned on, does the monitor still respect the dimmer control?  In my various iBus logs I can't see any instance of these messages being sent from the Nav to the monitor on initialisation, so either some other mechanism is used or the monitor is supposed to remember the brightness itself.

 

I would propose that the Intravee could grab the set dimmer value from the brightness messages sent when the slider is changed, then send that value at some point during the initialisation process, probably shortly after the monitor announces itself on the iBus after power up, but it may need to be later than that, maybe ignition on.

I get the feeling the monitor is supposed to remember the brightness itself, but I could be wrong.  It seems a last resort to have to have the Intravee set the brightness level, but if it's simple enough to add it as an option in the light control menu (or wherever you see fit), that would be great.  

 

I did notice that once I sent a command over the iBus and the monitor brightened, the dimmer control slider still indicated that it was at half brightness (which is what it keeps resetting to currently), but once I adjusted the slider the brightness dropped to that setting.  In other words, the command sent over the iBus bumped it up to 72%, but the slider still showed 50%.  Adjusting it one notch to say 55% and the brightness dropped straight from 72% to 55%.  

 

I should mention that I tried those commands with the parking/headlights off.  I'm not sure if turning the headlights on/off after sending the command to increase the brightness will make it revert back to the slider indicated setting.  Or if forcing the light sensor to adjust (by shining a light into it) will also make it revert back.  I can try those later and see what it does.

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