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Logitech G502 and evdev lag
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Joined: 06 Apr 2004
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PostPosted: Tue Sep 27, 2016 4:30 pm    Post subject: Logitech G502 and evdev lag Reply with quote

I have a Logitech G502 and through Windows and I have bound the sniper key to Scroll Lock (even tried other keys for this problem) to act as a Push To Talk button in my games. The configuration is saved to the mouse hardware and it seems to be working. But when I am playing games, I am noticing that when I hold my sniper button to talk, my games start to lag and drop frames. This is what I find in my Xorg.0.log

(EE) [mi] EQ overflowing.  Additional events will be discarded until existing events are processed.
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x589af6]
(EE) 1: /usr/bin/X (mieqEnqueue+0x24b) [0x56bb6b]
(EE) 2: /usr/bin/X (QueuePointerEvents+0x52) [0x44dd22]
(EE) 3: /usr/lib64/xorg/modules/input/ (0x7f9af0795000+0x623f) [0x7f9af079b23f]
(EE) 4: /usr/lib64/xorg/modules/input/ (0x7f9af0795000+0x6acd) [0x7f9af079bacd]
(EE) 5: /usr/bin/X (0x400000+0x750c8) [0x4750c8]
(EE) 6: /usr/bin/X (0x400000+0x9a056) [0x49a056]
(EE) 7: /lib64/ (0x7f9af6b8b000+0x33290) [0x7f9af6bbe290]
(EE) 8: /lib64/ (__libc_fork+0xc4) [0x7f9af6c44254]
(EE) 9: /usr/bin/X (Popen+0x90) [0x5906c0]
(EE) 10: /usr/bin/X (0x400000+0x12af5b) [0x52af5b]
(EE) 11: /usr/bin/X (XkbDDXLoadKeymapByNames+0x85) [0x52b165]
(EE) 12: /usr/bin/X (0x400000+0x135135) [0x535135]
(EE) 13: /usr/bin/X (0x400000+0x355bf) [0x4355bf]
(EE) 14: /usr/bin/X (0x400000+0x39643) [0x439643]
(EE) 15: /lib64/ (__libc_start_main+0xf0) [0x7f9af6bab630]
(EE) 16: /usr/bin/X (_start+0x29) [0x423939]
(EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
(EE) [mi] mieq is *NOT* the cause.  It is a victim.
(EE) [mi] EQ overflow continuing.  100 events have been dropped.
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x589af6]
(EE) 1: /usr/bin/X (QueuePointerEvents+0x52) [0x44dd22]
(EE) 2: /usr/lib64/xorg/modules/input/ (0x7f9af0795000+0x623f) [0x7f9af079b23f]
(EE) 3: /usr/lib64/xorg/modules/input/ (0x7f9af0795000+0x6acd) [0x7f9af079bacd]
(EE) 4: /usr/bin/X (0x400000+0x750c8) [0x4750c8]
(EE) 5: /usr/bin/X (0x400000+0x9a056) [0x49a056]
(EE) 6: /lib64/ (0x7f9af6b8b000+0x33290) [0x7f9af6bbe290]
(EE) 7: /lib64/ (__libc_fork+0xc4) [0x7f9af6c44254]
(EE) 8: /usr/bin/X (Popen+0x90) [0x5906c0]
(EE) 9: /usr/bin/X (0x400000+0x12af5b) [0x52af5b]
(EE) 10: /usr/bin/X (XkbDDXLoadKeymapByNames+0x85) [0x52b165]
(EE) 11: /usr/bin/X (0x400000+0x135135) [0x535135]
(EE) 12: /usr/bin/X (0x400000+0x355bf) [0x4355bf]
(EE) 13: /usr/bin/X (0x400000+0x39643) [0x439643]
(EE) 14: /lib64/ (__libc_start_main+0xf0) [0x7f9af6bab630]
(EE) 15: /usr/bin/X (_start+0x29) [0x423939]
[129177.942] [mi] Increasing EQ size to 1024 to prevent dropped events.
[129177.943] [mi] EQ processing has resumed after 119 dropped events.
[129177.943] [mi] This may be caused by a misbehaving driver monopolizing the server's resources.
[129977.123] [mi] Increasing EQ size to 2048 to prevent dropped events.

Every time my games stutter, I can check Xorg.0.log and be sure that this message is in there. The condition only triggers if I am holding the sniper button and moving my character around with the keyboard. If I only use the mouse and rotate my character around while pressing sniper button, no problems occur. This also reproduces on a standard Dell keyboard.

Googling similar problems on the Internet show bad graphics drivers, but the stacktrace looks completely different. This is showing me evdev as the culprit, but I am already running the latest Xorg-server and evdev driver:


$ emerge -pv xorg-server xf86-input-evdev

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R    ] x11-base/xorg-server-1.18.4:0/1.18.4::gentoo  USE="glamor kdrive suid udev xorg -dmx -doc -ipv6 (-libressl) -minimal (-selinux) -static-libs -systemd -tslib -unwind -wayland -xephyr -xnest -xvfb" 5,869 KiB
[ebuild   R    ] x11-drivers/xf86-input-evdev-2.10.3::gentoo  395 KiB

Any ideas would be great. My guess has something to do with the mouse sending a regular keyboard event which confuses evdev? If it comes down to finding no solution, I'll have to bind a regular mouse button (maybe browser forward) to my sniper button instead of scroll lock.
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