Comment 140 for bug 1871268

With reference to post #132 above: If this is relevant to this issue.... I also am experiencing problems with switching drivers for the device on my systems that uses (or can use) a Ubuntu third party driver. Specifically nVidia for the GeForce 940MX. Changing between nVidia driver versions (all within the selections provided by Ubuntu's Updater) appears to succeed but driver performance is not correct. I restart after each driver change. I've seen screen tearing, freezing, video stuttering, etc while playing locally stored videos. I've used the same video file to test and the results remain unpredictable. Even going back to the generic xorg driver does not seem to fully stabilize performance of the 940MX. None of these issues were present prior to the mid-September Ubuntu updates associated with 20.04.1; and the nVidia driver(s) provided performance superior to the xorg version. Trying to reload Ubuntu in an attempt to squash these bugs triggered this crash bug. I obviously managed to work around it by NOT selecting third party drivers on install, but that necessitates changing the driver after install; and that has not worked well either.

If this is not relevant to this particular bug, then please disregard in deference to other bug reports. I provide this here only to assist by providing anecdotal observations in hopes that this may help in trying to resolve this third party driver related issue. And in the event that several of these bugs may be inter-related, please refer to also posts #84, 97, and 104 above regarding a group of bugs that all appeared following the mid-September Ubuntu LTS 20.04 updates; and note that there is a bug number (not listed above here) for the suspend on login issue, it is 1897185. Again: if this is not relevant to resolving this issue then disregard here.

Thank you.