Time before display dims (Tdim)

[DrDJones]

Thanks for all the replies to my issue. I can now be more accurate on what's happening. I have the latest OS as of a month ago. If I set TDim to 120000 (2 min), the display will continue to dim after 2 min even after turned off and back on. If I connect the calculator to my computer, which initiates charging, and then disconnect from the computer, the display will dim in 30 sec even though TDim remains at 120000. If I set TDim to 120000 again, the 120000 value controls until the calculator is connected to the computer again. So what appears to happen is connection to a computer (and possibly just connecting to a charger - I haven't checked that) causes the calculator to use the default value of 30000, even if another value is shown when TDim is interrogated, until TDim is manually changed again to a value other than 30000. My TOff value is never changed from 300000 (5 min), which is fine with me. I just find a 30 sec TDim value is irritating in normal use, so would like it to be something longer, say about 2 minutes.