Although there may have been some increased system stability from the
action I took a month ago, the following messages still appear on the
screen in between "opening the lid" and getting an unlock window post-
sleep:

[drm] nouveau 0000:01:00.0: 0x7393: i2c wr fail: -6
[drm] nouveau 0000:01:00.0: 0x73A5: i2c rd fail: -6
watchdog: only one watchdog can use /dev/watchdog.
watchdog: error registering /dev/watchdog (err=-16).
mei: unable to register watchdog device.

More importantly, occasionally (usually after enough sleep cycles to
fill the screen with these messages), the system hangs on this screen.
(Does not present the unlock window, and if switch to another virtual
console, won't register keyboard input.)

Diagnosing further, the [drm] points to the problem being with libdrm-
nouveau1a (or libdrm-nouveau1a (i386)) , but the package that depends on
it, libgl1-mesa-dri appears to be necessary for any hardware graphics
acceleration at all, including the integrated Intel graphics.

Since this continues to be an annoyance, I'll look into resolving this
issue as time permits.

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https://bugs.launchpad.net/bugs/1030387

Title:
  Closing notebook lid can log user out, breaks network manager and more

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