Ubuntu
xserver-xorg-video-intel package

  1. Bug #1247189
  2. Comment #39

Comment 39 for bug 1247189

Revision history for this message
penalvch (penalvch) wrote : Re: [Acer Aspire 5755G] Ubuntu freezes completely when switching user

Adam Niedling, thank you for providing the requested information. As per your https://launchpadlibrarian.net/161645392/CurrentDmesg.txt :
[ 6.254915] [drm] Wrong MCH_SSKPD value: 0x16040307
[ 6.254918] [drm] This can cause pipe underruns and display issues.
[ 6.254919] [drm] Please upgrade your BIOS to fix this

Given you are running currently running the latest BIOS available for your model, it would be helpful if you engaged Acer via your SNID to inquire about an updated BIOS being made available.

However, let this not be a show stopper in in finding a WORKAROUND without having to disable the nvidia card.

Given no call trace was found in your dmesg, could you please capture the xorg back trace following https://help.ubuntu.com/community/DebuggingSystemCrash ?