On Mon, 20 Jun 2016 23:15:02 +0200 Bruno Pagani <bruno.pagani@xxxxxxxxxxxx> wrote: > 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 > > ? No, I did not. I completely forgot to check the bugtracker. I'll do that firs next time I have a problem. > If not, try disabling fbc. Eventually report upstream if it still > hasn’t been done (I’m not affected myself, so…). Disabling fbc solved the problem for me, I'm now back again to 4.6.2-1. What's strange is, that not only QT applications are affected. sakura uses GTK, and sublime uses a custom UI toolkit. All of those are fine now. I'll let them know in the comments, so they can check if it's the same bug. Thanks for your help! -- Grüße/Regards Manuel Groß
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