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  1. Bug #1641152
  2. Comment #21

Comment 21 for bug 1641152

Revision history for this message
Artem V L (artvl) wrote :

Yes, this issue has started after the update and was not occurred after I upgraded from 14.04 to 16.04 until some of the latest updates, though it might be pre-last kernel update.
It seems, this issue occurs since the latest version(s) of the 4.4.0-47 kernel, definitely in 4.4.0-47.68 and might be in 4.4.0-47.50 but I'm not 100% about that.

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I tested with the v4.9-rc5 kernel, but it does not support my WiFi network card, so the test was very fast (I can't work without WiFi).
The issue has not been reproduced, but it is not always reproducable even on 4.4.0-47.68. So it is not known whether the issue exists in the latest kernel and that is why I've not assigned any tag (kernel-bug-exists-upstream / kernel-fixed-upstream).
However, another issues discovered on v4.9-rc5:
1. A laptop does not [always] go to the sleep (susbend) mode on lid closing when the external monitor is plugged, instead the all desktop windows are relocated to the external monitor.
2. When the external monitor is plugged off, the windows are NOT relocated to the laptop display, becoming totally unreachable.

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Peculiarities about the Scrambled UI issue on 4.4.0-47[.68]: all windows of native apps are affected, but not the Java windows (Chrome browser and Libre Office UIs work fine).

By the way, besides the Scrambled UI there are a few more issues in the 4.4.0-47[.68]:

1. WiFi network connectivity disappeared (might be when is not used for some time), but the icon (near the time on the top right corner of the destop) shows the connection having fine signal strength. The connectivity restarts when I click on the currently connected network.

2. Sometimes the connectivity disappears totally and the icon clearly shows it. Then I have to restart the network manager service. Particularly this issue seems to be present since I upgraded from 14.04 (since the 4.4.0-43.63 kernel).

3. Often the touchpad stops work at all (for example now) though "xserver-xorg-input-synaptics is already the newest version (1.8.2-1ubuntu3)". This issue also exists since I upgraded from 14.04.
The touchpad works fine on v4.9-rc5, though the test was very fast and I'm not sure that this issue is really fixed.