Comment 0 for bug 1752194

Trying to run anything in intel-gpu-tools (tested intel_gpu_top, intel_gpu_time and intel_backlight) on my laptop as root yields the following output:
(intel_gpu_top:23021) intel-mmio-CRITICAL: Test assertion failure function intel_mmio_use_pci_bar, file ../../lib/intel_mmio.c:145:
(intel_gpu_top:23021) intel-mmio-CRITICAL: Failed assertion: !(error != 0)
(intel_gpu_top:23021) intel-mmio-CRITICAL: Last errno: 1, Operation not permitted
(intel_gpu_top:23021) intel-mmio-CRITICAL: Couldn't map MMIO region
Stack trace:
  #0 [_init+0x1753f]
  #1 [_init+0xc978]
  #2 [_init+0x118d]
  #3 [__libc_start_main+0xf1]
  #4 [_init+0x1fba]
  #5 [<unknown>+0x1fba]
Test (null) failed.
**** DEBUG ****
(intel_gpu_top:23021) intel-chipset-DEBUG: Test requirement passed: pci_dev
(intel_gpu_top:23021) intel-mmio-CRITICAL: Test assertion failure function intel_mmio_use_pci_bar, file ../../lib/intel_mmio.c:145:
(intel_gpu_top:23021) intel-mmio-CRITICAL: Failed assertion: !(error != 0)
(intel_gpu_top:23021) intel-mmio-CRITICAL: Last errno: 1, Operation not permitted
(intel_gpu_top:23021) intel-mmio-CRITICAL: Couldn't map MMIO region
(intel_gpu_top:23021) igt-core-INFO: Stack trace:
(intel_gpu_top:23021) igt-core-INFO: #0 [_init+0x1753f]
(intel_gpu_top:23021) igt-core-INFO: #1 [_init+0xc978]
(intel_gpu_top:23021) igt-core-INFO: #2 [_init+0x118d]
(intel_gpu_top:23021) igt-core-INFO: #3 [__libc_start_main+0xf1]
(intel_gpu_top:23021) igt-core-INFO: #4 [_init+0x1fba]
(intel_gpu_top:23021) igt-core-INFO: #5 [<unknown>+0x1fba]
**** END ****
FAIL (-1.000s)

Happens under bot Wayland and XOrg.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: intel-gpu-tools 1.20-1ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Feb 28 00:30:15 2018
InstallationDate: Installed on 2015-11-25 (825 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: intel-gpu-tools
UpgradeStatus: Upgraded to artful on 2017-11-01 (118 days ago)