[Xcb] [Bug 106405] New: [Regression 1.12->1.13] "read from connection when polling" causes video to freeze

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sat May 5 04:22:57 UTC 2018


            Bug ID: 106405
           Summary: [Regression 1.12->1.13] "read from connection when
                    polling" causes video to freeze
           Product: XCB
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Library
          Assignee: xcb at lists.freedesktop.org
          Reporter: john at jlindgren.net
        QA Contact: xcb at lists.freedesktop.org

After updating libxcb to 1.13, video intermittently freezes in Skype calls. 
Actually, it's not just the video stream that hangs, the whole Skype window
freezes temporarily (1-10 seconds).  Switching in/out of fullscreen gets things
moving again.

The hangs are most noticeable in Skype (which is Chromium-based) but also occur
occasionally in Chromium itself; I have seen brief but definite
freezes/stutters in YouTube and Netflix video, as well as scrolling through at
least some web pages (amazon.com for example).

Reverting the following commit makes everything smooth again:

Since Skype and Chromium share the same codebase, and I haven't seen freezes in
other applications, it could be a bug in Chromium that is merely triggered by
the libxcb change.  I don't know enough of the internals of either project to
say which is at fault.

Disabling compositing (compton) seemed to work around the issue but of course
leads video tearing, which is no less annoying.

Arch Linux x86_64 w/ kernel 4.16.5-1
Intel (Skylake) graphics w/ modesetting driver + DRI2
Xorg 1.19.6+13+gd0d1a694f-2
Mesa 18.0.1-1
Compton 0.1_beta2.5-10 w/ GLX backend

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