[Bug 76271] intel-virtual-output: one remote head fails to update

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76271

--- Comment #18 from Kirill Müller <mail at kirill-mueller.de> ---
top looks perfectly normal, Gnome Shell is at about 8%, below are the first few
lines of perf top:

 25.91%  nvidia_drv.so                            [.] 0x00000000000935a0
  5.51%  [drm]                                    [k] drm_clflush_page
  3.29%  [vdso]                                   [.] 0x0000000000000422
  2.74%  intel_drv.so                             [.] 0x00000000000513c0
  1.92%  libv8.so                                 [.] 0x0000000000242052
  1.53%  libglib-2.0.so.0.3800.1                  [.] 0x000000000008986e

(Note: I'm running a low-latency kernel. No idea if it matters.)

The lag persists after turning on FORCE_16BIT_XFER.

Where do I set Option "AllowSHMPixmaps" "true" ?

Compilation with DBG=1 gives me plenty of errors in 3310ee89c1f1a.

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