Ubuntu
linux package

  1. Bug #1506817
  2. Comment #37

Comment 37 for bug 1506817

Revision history for this message
Jont Allen (jontalle) wrote :

Status of left mouse bug sticking on X250:

I am trying to find a way to put my X250 back in service, to replace the X220i that I fell back to given the serious nature of the LMSB (LMBS = "Left mouse button sticking")

1) By switching to a logitech USB mouse I am able to work on the machine.

2) I turned off the TrackPoint (red eraser head mouse) and the TrackPad in the BIOS. However even with the latest BIOS installed (see posting #26 above).

Very important: When the trackpoint and trackpad are turned off in the BIOS, they are not disabled until I login.
This is distinct from the behavior of the X220i for which turning off the TrackPad disables it upon reboot (as it should).

Conclusion: There is a bug in the BIOS in that the settings for the TrackPad and TrackPoint following a boot, are ignored.

3) No combination of new kernels seems to have any effect on the LMBS bug. It seem likely to me that the issue is in the synaptics driver. This driver works fine on the X220i and the X201 (These are older laptops that I have been using after I retired the X250 from service, due to the LMBS problem made the laptop unuseable).

4) When I use the X250 with the Logitech USB mouse, I am able to work (I dont like taking my hands off the keyboard to reach for the mouse, but the LMBS makes using the TrackPoint unuseable, so it must be turned off)

5) There seems to be a new bug with the latest kernels. The screen randomly flashes for a fraction of a second. This happens about every 20 seconds, on average. Sometimes it happens every 5 seconds. This blink of the backlight is most irrititating. I dont think I can get used to this distraction as the screen is very bright, and the blink is impossible to ignore. This started happening with the newer kernels. I dont know exactly when, maybe somewhere around 4.5.

6) I have upgraded the OS to 16.04LTS. All of the above comments apply to 16.04LTS.

7) For daily use I will still be using X220i but at least I can work on the machine as long as I use the Logitech USB mouse, and can tolerate the blinking. This comment was written using the X250 in this mode. The blinking is giving me a headache!