Problems with [Alt]- / [AltGr]- keys in blender 2.78... #51689
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Reference: blender/blender#51689
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System Information
Ubuntu 16.04.2 LTS 64bit
Keyboard with german layout
Blender Version
Broken:
2.78.4
8b0f968a31(2017-05-31) (blender-2.78-8b0f968a31-linux-glibc219-x86_64.tar.bz2)2.78c offical
Short description of error
when i use the [Alt] or the [AltGr] key in blender then some other keys (and mouse clicks) do not work anymore in blender as expected.
Exact steps for others to reproduce the error
the quickest way to reproduce is:
when i press two letters that uses the [Alt] key (e.g. "", "- " or "")then there is no issue anymore and i cant get blender to show up that issue anymore, until i close (unlink) that document and repeat from step 3.
i have deleted the .config/Blender folder to get rid of all potentially custom settings. but even then i could observe that issue.
Changed status to: 'Open'
Added subscriber: @beta-tester
Proglems with [Alt]- / [AltGr]- keys in blender 2.78...to Problems with [Alt]- / [AltGr]- keys in blender 2.78...Added subscriber: @mont29
Cannot confirm that here… This sounds like a weird keyboard/keyboard conf glitch, can you maybe try to reproduce that issue on some other computer with some other keyboard? Also, can you try to reproduce it starting blender with factory settings (
--factory-startupcommandline option)?hi, i have only access to german keyboards.
but i tried blender out on other computers and OS'es.
i tried out Windows 10, Ubuntu 16.04.2 LTS, Ubuntu 17.04...
it seems the real problem is TeamViewer (a remote control program).
i could not reproduce the issue as long there is no TeamViewer installed.
when there is TeamViewer (12.0.76279) installd on Ubuntu, ten i can reproduce that issue. (sometimes i have to hold the [AltGr]-ke and press quickly multiple times - [x] or - [x] , then only the [<----]-key, then some more [AltGr]+- [x] or - [x], then i run in that issue as well)
if you live in german and you have access to the desinfec't-2017 live anti virus DVD from heise (from 2017-05-25), then you can reproduce that issue by booting into that LiveDVD and start and exit TeamViewer, then download blender x86 version and run it.
go to the text editor, press new, tyle in multiple times AltGr+8/AltGr+9 quickly, press [<----] -key to delete some of the - [x]]- [x]][ letters and type in some more [AltGr]+- [x] and - [x] letters.
now is should appear that issue again, when you press [<----]-key to delete the last letters...
even TeamViewer is not running anymore it seems there is something running that "capture" the keyboard.
but i dont know why only blender is affected from that. nothing else and nowhere else that kind of issue is visible on that affected systems.
hmmm...
now i downloaded and installed the old "ScreenCast Keys" - addon (space_view3d_screencast_keys.py) to see what it will display in that issue situation.
unfortunately (for me in this situation) it does not show up in the text editor but when i quickly move the mouse cursor to the 3d view, some of the last pressed keys of the text editor will show up in the 3d view.
it looks like the [Alt]-key will stick, when that issue appears, even i do not hold the [Alt]-Key anymore. but i found out i can unlock the [Alt]-key, when i press the [Alt]-key again without pressing any other key
(in the Video shown as ALT + NONE).
is that an feature of blender or ubuntu?
see attached a screen cast video i made Alt-Key-Issue0001-0770.m4v
BTW: that screen cast was made on the system, where TeamViewer is istalled (but not running).
To check on events, best thing to do is start Blender with
--debug-eventsoption, and look in the console, all events captured by Blender will be printed there.But this really looks like some weird interference from teamviewer app, not sure we can do anything a bout it - that would not be the only keyboard-messing app causing issues with Blender…
i used the
--debug-eventsoption. with that option enabled it is way harder to force blender to go into that issue situation. sometimes i can not reproduce that issue anymore...here a run, where i could reproduce that issue.
there are some UNKNOWN events just after the alt key press.
and just after releasing the alt key
here the full log the back spaces are not accepred anymore
??? i see some key events in the log with
val:4 / DOUBLE_CLICK... i never touched my mouse in that time.will be quickly hitting keys detected as DOUBLE_CLICK on the keyboard ?
sorry for that frequence of posting.
the only difference i could see between an affected system and a none affected system is, that on the affected system there is an event type "RIGHT_ALT"
that never appear on the log on a none affected system.
on a none affected system i only can see the "UNKNOWN" events at the time when i press or release the ALT key on the keyboard.
on an affected system i see the "RIGHT_ALT" followed by "UNKNOWN" at pressing and only two "UNKOWN" events at releasing the alt key.
when this is not an issue that can be fixed in blender, then please excuse my "faulty" report. and you can close it - i will not waste more time of your.
here the log from an none affected in case of interest:
debug-events-no-issue.txt
Changed status from 'Open' to: 'Archived'
OK… the problem here are indeed those 'unknown keys' events - for some reason, it sends two of them, and only one is recognized when pressed, none when released. This sets up the 'lat' modifier state, but does not release it, which 'locks' all non-char key press, since they are interpreted as if alt was pressed (alt-Back e.g. won't erase chars, etc.).
I cannot really investigate this further, since even when setting a German layout on my keyboard I cannot reproduce the issue (am only getting one set of press/release 'UNKNOWN' event here, which are the GRLESS key I think). This does look a bit like a problem with keyboard config though, imho it should either generate GRLESS or ALT_R events, not both - and it should definitively generate matching events on press and release!
Will close the report for now, thanks for the investigation effort, but we'd need to be able to reproduce the issue to go further am afraid. :/