Ouch, I think the log in comment #19 is pretty definitive. Does everyone/most people have those log messages in Xorg.0.log?...
[ 8.690] (II) AIGLX: Screen 0 is not DRI2 capable [ 8.690] (EE) AIGLX: reverting to software rendering -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1632165 Title: modesetting driver unbearably slow on intel graphics Status in xorg-server package in Ubuntu: Confirmed Bug description: After upgrading to Yakkey, I found the graphics performance of my MacBookPro12,1 (13", 2015, retina/hidpi display) became unbearably slow - switching workspaces, playing games, even just scrolling web browser tabs was visibly slower. The computer became constantly warm, and battery life dropped. Switching from using from modesetting back to the intel driver fixed these problems. ProblemType: Bug DistroRelease: Ubuntu 16.10 Package: xserver-xorg-core 2:1.18.4-1ubuntu6 ProcVersionSignature: Ubuntu 4.8.0-21.23-generic 4.8.0 Uname: Linux 4.8.0-21-generic x86_64 ApportVersion: 2.20.3-0ubuntu7 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None CurrentDesktop: GNOME Date: Tue Oct 11 11:47:47 2016 DistUpgraded: 2016-10-05 14:48:30,702 ERROR got error from PostInstallScript ./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process "./xorg_fix_proprietary.py" (No such file or directory) (8)) DistroCodename: yakkety DistroVariant: ubuntu ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: Intel Corporation Iris Graphics 6100 [8086:162b] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Apple Inc. Iris Graphics 6100 [106b:013f] InstallationDate: Installed on 2015-07-22 (446 days ago) InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 05ac:0273 Apple, Inc. Bus 001 Device 002: ID 05ac:8290 Apple, Inc. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Apple Inc. MacBookPro12,1 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-21-generic root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash acpi_backlight=vendor i915.fastboot=1 vt.handoff=7 SourcePackage: xorg-server UpgradeStatus: Upgraded to yakkety on 2016-10-05 (5 days ago) dmi.bios.date: 09/28/2015 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP121.88Z.0167.B14.1509281135 dmi.board.name: Mac-E43C1C25D4880AD6 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro12,1 dmi.chassis.type: 9 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-E43C1C25D4880AD6 dmi.modalias: dmi:bvnAppleInc.:bvrMBP121.88Z.0167.B14.1509281135:bd09/28/2015:svnAppleInc.:pnMacBookPro12,1:pvr1.0:rvnAppleInc.:rnMac-E43C1C25D4880AD6:rvrMacBookPro12,1:cvnAppleInc.:ct9:cvrMac-E43C1C25D4880AD6: dmi.product.name: MacBookPro12,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. version.compiz: compiz N/A version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.70-1 version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.3-1ubuntu2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.3-1ubuntu2 version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160706-1ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1632165/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
