Le 20/06/2016 à 22:55, Gaëtan Harter via arch-general a écrit : > On Mon, Jun 20, 2016 at 7:17 PM, Manuel Groß <mgr@xxxxxxxxxxxxx> wrote: > >> Hello there, >> >> I currently experience a weird keyboard lag issue which I yet failed >> to resolve. I had some help looking into it a bit (and obviously >> searched the web), but we couldn't identify the speficic problem. I hope >> someone could provide me pointers or hints on what to test out. >> >> I have a Thinkpad x250 running Arch Linux with Openbox and X11 on it. >> I use systemd-logind to log in, so X is started with the 'exec >> openbox-session' from my xinitrc. Not from some fancy lightdm or so. >> I do not have a certain date since when the issue occurs, but it has >> probably been a little over a month. I didn't make any major changes to >> my system then, and I do update regularly. This didn't occur when I set >> up the system. >> >> The issue is, that on some, certain programs, the keyboard input >> 'arrives' too late, with delays up to 1-2s. In other programs, this >> never happens at all. And in rare occasions, it is even fine for >> programs, in which I experience the problem. >> I checked logs at obvious locations, but neither the systemd journal, >> dmesg or the Xorg log were screaming 'I have an issue here'. >> The trackpoint always works as excpected and the touchpad is disabled. >> >> Programs where the delay occurs: >> * sakura >> * sublime >> * wireshark (qt5 version) >> >> Programs which are fine: >> * claws-mail >> * geany >> * xterm >> * chromium >> >> The delay also never occurs in the system shell (Alt+F2) and xterm, so >> it's not the shell or oh-my-zsh. >> The program lists suggests, that it is not a problem due to a specific >> version of GTK or QT, since programs using either library (or none of >> them) are affected. >> >> I tried using 'libinput' instead of 'evdev' as a keyboard driver, >> but the change had no effect (I double checked the Xorg log which driver >> was actually used). >> In 'xev', all keystrokes arrive immediately. >> >> So seems not to be the kernel or the driver, nor a specific gtk or qt >> library. >> The next thing to test would probably be the xlib and the libxcb >> themselves. So I used 'downgrader' to downgrade each a few revisions >> (also their lib32-libraries) and checked for a change, without success. >> >> I don't know what to try next. Does anyone of you have an idea or >> already solved a similar issue? I'd appreciate any help on this. >> -- >> Grüße/Regards >> Manuel Groß >> > Hi Manuel, > > I have a Thinkpad T440p and I have the same issue with kernel 4.6, with > both 4.6.2-1 and 4.6.1-XX versions. > There is no issue with lts kernel 4.4.13-1. > > From what I experienced, gnome-terminal is impacted, and I think also > firefox. > > > Regards, > Gaëtan Harter Did you have a look at these: https://bugs.archlinux.org/task/49431 https://bugs.archlinux.org/task/49623 ? If not, try disabling fbc. Eventually report upstream if it still hasn’t been done (I’m not affected myself, so…). Bruno
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