I can try to update the BIOS, but given that the BIOS release notes (see below) don't mention anything regarding this, it's not likely to fix anything. The issue disappeared for a while, but has returned in the past month or so; I'm guess a kernel driver update fixed it, then regressed.
BIOS 1.29 release notes: [Important updates] Nothing. [New functions or enhancements] - Updated Realtek v2.06 PXE rom and v2.016 UNDI driver. [Problem fixes] Nothing. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1578011 Title: Laptop sometimes doesn't detect external monitor when docked To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1578011/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp