mjhjmtu

After messing around with some PPAs in an attempt to upgrade the Mesa drivers under Linux Mint 17.3 KDE on my Lenovo Ideapad, I managed to seemingly bring everything back to working order. Now, however, whenever I try running an OpenGL program, I get output like this:

$ glxgears
libGL error: pci id for fd 4: 8086:1916, driver (null) 
i965_dri.so does not support the 0x1916 PCI ID.
libGL error: failed to create dri screen
libGL error: failed to load driver: i965

and upon quitting, something like this (or an unusual segfault, with my own allegro-related projects):

XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
 after 13936 requests (13934 known processed) with 0 events remaining.

while the program, apparently, runs normally. (Except, glxgears doesn't seem to be capping itself at 60fps anymore, which it did earlier.)

Here's some hopefully relevant output:

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated Graphics (rev 07)
$ dpkg -l | grep mesa
ii libegl1-mesa:amd64 10.1.3-0ubuntu0.6 amd64 free implementation of the EGL API -- runtime 
ii libegl1-mesa-dev 10.1.3-0ubuntu0.6 amd64 free implementation of the EGL API -- development files
ii libegl1-mesa-drivers:amd64 10.1.3-0ubuntu0.6 amd64 free implementation of the EGL API -- hardware drivers
rc libegl1-mesa-lts-vivid:amd64 10.5.9-2ubuntu1~trusty2 amd64 free implementation of the EGL API -- runtime
ii libgl1-mesa-dev 10.1.3-0ubuntu0.6 amd64 free implementation of the OpenGL API -- GLX development files
ii libgl1-mesa-dri:amd64 10.1.3-0ubuntu0.6 amd64 free implementation of the OpenGL API -- DRI modules
rc libgl1-mesa-dri-lts-vivid:amd64 10.5.9-2ubuntu1~trusty2 amd64 free implementation of the OpenGL API -- DRI modules
rc libgl1-mesa-dri-lts-vivid:i386 10.5.9-2ubuntu1~trusty2 i386 free implementation of the OpenGL API -- DRI modules
ii libgl1-mesa-glx:amd64 10.1.3-0ubuntu0.6 amd64 free implementation of the OpenGL API -- GLX runtime
ii libgl1-mesa-glx:i386 10.1.3-0ubuntu0.6 i386 free implementation of the OpenGL API -- GLX runtime
rc libgl1-mesa-glx-lts-vivid:amd64 10.5.9-2ubuntu1~trusty2 amd64 free implementation of the OpenGL API -- GLX runtime
rc libgl1-mesa-glx-lts-vivid:i386 10.5.9-2ubuntu1~trusty2 i386 free implementation of the OpenGL API -- GLX runtime
ii libglapi-mesa:amd64 10.1.3-0ubuntu0.6 amd64 free implementation of the GL API -- shared library
ii libglapi-mesa:i386 10.1.3-0ubuntu0.6 i386 free implementation of the GL API -- shared library
rc libglapi-mesa-lts-vivid:amd64 10.5.9-2ubuntu1~trusty2 amd64 free implementation of the GL API -- shared library
rc libglapi-mesa-lts-vivid:i386 10.5.9-2ubuntu1~trusty2 i386 free implementation of the GL API -- shared library
rc libgles1-mesa-lts-vivid:amd64 10.5.9-2ubuntu1~trusty2 amd64 free implementation of the OpenGL|ES 1.x API -- runtime
ii libgles2-mesa:amd64 10.1.3-0ubuntu0.6 amd64 free implementation of the OpenGL|ES 2.x API -- runtime
ii libgles2-mesa-dev 10.1.3-0ubuntu0.6 amd64 free implementation of the OpenGL|ES 2.x API -- development files
rc libgles2-mesa-lts-vivid:amd64 10.5.9-2ubuntu1~trusty2 amd64 free implementation of the OpenGL|ES 2.x API -- runtime
ii libglu1-mesa:amd64 9.0.0-2 amd64 Mesa OpenGL utility library (GLU)
ii libglu1-mesa:i386 9.0.0-2 i386 Mesa OpenGL utility library (GLU)
ii libglu1-mesa-dev 9.0.0-2 amd64 Mesa OpenGL utility library -- development files
ii libmirclientplatform-mesa:amd64 0.1.8+14.04.20140411-0ubuntu1 amd64 Display server for Ubuntu - client platform library for Mesa
ii libopenvg1-mesa:amd64 10.1.3-0ubuntu0.6 amd64 free implementation of the OpenVG API -- runtime
ii libwayland-egl1-mesa:amd64 10.1.3-0ubuntu0.6 amd64 implementation of the Wayland EGL platform -- runtime
rc libwayland-egl1-mesa-lts-vivid:amd64 10.5.9-2ubuntu1~trusty2 amd64 implementation of the Wayland EGL platform -- runtime
ii mesa-common-dev 10.1.3-0ubuntu0.6 amd64 Developer documentation for Mesa
ii mesa-utils 8.1.0-2 amd64 Miscellaneous Mesa GL utilities

EDIT: lspci -v reveals that the "Kernel driver in use" is "i915_bpo". Should this be i965 instead?

EDIT: here's some cleaned up glxinfo output:

name of display: :0
libGL error: pci id for fd 4: 8086:1916, driver (null)
i965_dri.so does not support the 0x1916 PCI ID.
libGL error: failed to create dri screen
libGL error: failed to load driver: i965
display: :0 screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
...
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
...
GLX version: 1.4
GLX extensions: 
...
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.4, 256 bits)
OpenGL version string: 2.1 Mesa 10.1.3
OpenGL shading language version string: 1.30
OpenGL extensions:
...

EDIT: here's some formatted inxi output:

$ inxi -Gi
Graphics: 
Card: Intel Sky Lake Integrated Graphics
Display Server: X.Org 1.15.1 drivers: intel (unloaded: fbdev,vesa)
Resolution: 1920x1080@60.1hz
GLX Renderer: Gallium 0.4 on llvmpipe (LLVM 3.4, 256 bits) 
GLX Version: 2.1 Mesa 10.1.3

EDIT: more relevant output

$ lsmod | grep 'i9' 
i915_bpo 1138688 3 
intel_ips 20480 1 i915_bpo
i2c_algo_bit 16384 1 i915_bpo
drm_kms_helper 126976 1 i915_bpo
drm 344064 4 i915_bpo,drm_kms_helper
video 20480 1 i915_bpo

$ modinfo i915_bpo
filename: /lib/modules/3.19.0-32-generic/kernel/ubuntu/i915/i915_bpo.ko
license: GPL and additional rights
description: Intel Graphics
author: Intel Corporation
author: Tungsten Graphics, Inc.
firmware: i915/skl_dmc_ver1.bin
srcversion: 55E14C24236445DE1BF5F67

EDIT: Virtually every GL-related application has been misbehaving in some way or another; GIMP, especially. These are definitely not the drivers I had earlier. ppa-purge was also unhelpful, although I've long since manually deleted the ppa files.