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[Launchpad Bug Tracker <1039830@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1039830

Title:
  Acer eMachines E725 High Pitched Whine with Ubuntu 12.04

Status in linux package in Ubuntu:
  Expired

Bug description:
  Acer eMachines E725 High Pitched Whine with Ubuntu 12.04

  related to kernel

  After updating to Ubuntu 12.04 my laptop emits a high pitched whining
  sound from where I assume is the GPU. I encountered the common "black
  screen on boot" bug and can use workarounds to deal with that however,
  the whining noise persists. I followed the suggestion of others and
  changed to:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor
  i915.invert_brightness=1"

  in my /etc/grub file. Mysteriously, the whining noise was gone and the
  "black screen on boot" issue was fixed, but this left me unable to
  acheive maximum screen resolution. But that's beside the point (b/c it
  causes the VESA driver to load up instead of Intel for some reason).

  All of this had lead me to believe that there is a bug with the Intel
  graphics driver for my model of laptop which uses the Mobile Intel
  Series 4 chipset.

  My laptop operates perfectly on Ubuntu 10.04, no whining noise, no
  "black screen on boot" issue.

  lspci results:
  00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 09)
  00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
  00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
  00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
  00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
  00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
  00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
  00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
  00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03)
  00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
  00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
  00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
  00:1d.3 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
  00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
  00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
  00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
  00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] (rev 03)
  00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
  04:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
  05:00.0 Ethernet controller: Atheros Communications Inc. AR8132 Fast Ethernet (rev c0)

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