Hi Michael, 2018-09-05 3:01 GMT+02:00 Michael Schmitz <schmitz...@gmail.com>: >> on my Falcon i have the problem that under heavy load (like apt update) >> moving the mouse often causes a key "hang" and repeat. Pressing >> the space bar stops the repeating of the hanging key. > > > Keyboard interrupts can be locked out for long enough for the driver to miss > data. Apparently that does include crucial break codes. > > Do you see any 'keyboard overrun' messages in the console logs? > >> On an Atari, the mouse is connected to the keyboard, and produces >> keyboard-like events. Moving a mousewheel is same as cursor up/down, >> for example. I guess that the buffer overflows when CPU is occupied. >> >> If someone has an idea how to prevent that, i'd be thankful. >> But then, its not a showstopping issue. A 100& used CPU will probably >> just fail to fetch the IKBD buffer in time. > > > The keyboard driver already tries to resynchronize the packet stream if it > missed packets. Maybe we also need to synthesize a break code if the last > key event sent to the input layer was a make code. Look at the state machine > in arch/m68k/atari/atakeyb.c - line 163 says to skip this byte which is > certainly necessary, but maybe additionally you want to check whether the > previous keyboard state was KEYBOARD, and the break_flag was clear, and send > out an input event for the previous scancode as key up event in that case . > Need to keep track of the previous scancode though, and it won't protect you > from key repeats when multiple keys were recorded as down at the time the > overrun happens. >
I tried to fix this key stuck effect in FreeMiNT's keyboard driver but I failed :-/, in this link you have some information about my attempt: https://github.com/freemint/freemint/issues/87 I'm a bit sceptic that this can be fixed in the keyboard driver, but may be I'm wrong and I missed something. What it could be done is a workaround in the drivers that are disabling the interrupts for a long time, this workaround is a clever solution done in the drivers for the Lightning VME an USB card for the TT, MiNT's NetUSBee driver copied that workaround. It's all in the link above.
