Ubuntu – Updated Intel display driver causing errors when booting

14.04intel graphicsvideo-driver

I upgraded to to Graphics Installer 1.0.6 on my Ubuntu 14.04 and installed the drivers using the Intel Graphics Installer. The laptop is Intel Ivybridge powered with Intel HD graphics. It Optimus but I have disabled the Nvidia card in bios. The Intel Graphics Installer installs the package i915-3.15-3.13-dkms.deb which I assume is the updated driver. It causes a bunch of error messages when I boot. Here are the relevant errors from dmesg when I boot:

[    7.206151] drm: module verification failed: signature and/or  required key missing - tainting kernel
[    7.208045] drm: module has bad taint, not creating trace events
[    7.336470] fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
[    7.393854] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013)
[    7.393855] [drm] Driver supports precise vblank timestamp query.
[    7.393921] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    7.505798] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[    7.507233] init: Failed to obtain startpar-bridge instance: Unknown parameter: INSTANCE
[    7.944183] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun
[    8.368479] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    8.368480] i915 0000:00:02.0: registered panic notifier
[    8.818416] [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off

What could the problem be and will it affect performance? I tried to remove the package and the errors went away but I'm then running and older driver I assume?

Best Answer

Here is how I uninstalled the latest Intel Graphics Driver :

Open a new Terminal (CTRL+Alt+T) and execute

gksudo gedit /etc/apt/preferences.d/intel-removal

Paste this code in the File and save it

Package: *
Pin: release a=trusty*
Pin-Priority: 1001
Package: *
Pin: origin download.01.org
Pin-Priority: -100

Run

sudo apt-get dist-upgrade

You will be asked to downgrade about 20 packages and that's what you want.

Just some cleaning up to do:

sudo rm /etc/apt/preferences.d/intel-removal

sudo rm /etc/apt/sources.list.d/intellinuxgraphics.list*

sudo apt-get update

Now you must delete the actual drivers :

sudo apt-get purge i915-3.15-3.13-dkms intel-linux-graphics-installer

Finally reboot

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