Bug#715278: intel-gpu-tools: "Couldn't map MMIO region: Resource temporarily unavailable" on intel_reg_read, after dist-upgrade

[Brandon Simmons <brandon.m.simmons@gmail.com>]

Package: intel-gpu-tools
Version: 1.2-1
Severity: normal

Dear Maintainer,
I have been setting backlight PWM frequency this way:

  http://devbraindom.blogspot.com/2013/03/eliminate-led-screen-flicker-with-intel.html

After a dist-upgrade to kernel 3.9, I now get this error on
intel_reg_read/write:

  $ sudo intel_reg_read 0xC6204
  Couldn't map MMIO region: Resource temporarily unavailable

And in syslog, I see:

  Jul  7 11:02:24 jberryman kernel: [ 1138.669072] intel_reg_read:6168 conflicting memory types f0000000-f0400000 uncached-minus<->write-combining
  Jul  7 11:02:24 jberryman kernel: [ 1138.669082] reserve_memtype failed [mem 0xf0000000-0xf03fffff], track uncached-minus, req uncached-minus

Thanks,
Brandon


-- System Information:
Debian Release: jessie/sid
  APT prefers testing-proposed-updates
  APT policy: (500, 'testing-proposed-updates'), (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 3.9-1-686-pae (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages intel-gpu-tools depends on:
ii  libc6          2.17-6
ii  libdrm-intel1  2.4.45-3
ii  libdrm2        2.4.45-3
ii  libpciaccess0  0.13.1-2

intel-gpu-tools recommends no packages.

intel-gpu-tools suggests no packages.

-- no debconf information