same problem started after kernel update
uname -r
3.2.0-40-generic

dmesg -k |grep GEN6_RP
[186612.716928] [drm:gen6_sanitize_pm] *ERROR* Power management discrepancy: 
GEN6_RP_INTERRUPT_LIMITS expected 16000000, was 12060000

lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family 
DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core 
Processor Family PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core 
Processor Family Integrated Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host 
Controller (rev 04)
00:16.0 Communication controller: Intel Corporation Panther Point MEI 
Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host 
Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio 
Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1 
(rev c4)
00:1c.5 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 6 
(rev c4)
00:1c.6 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 7 
(rev c4)
00:1c.7 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 8 
(rev c4)
00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host 
Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation Panther Point 6 port SATA Controller 
[AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI 
Express Gigabit Ethernet controller (rev 09)
04:00.0 USB controller: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host 
Controller
05:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA Controller 
(rev 01)

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https://bugs.launchpad.net/bugs/1168467

Title:
  "phy0 -> rt2800pci_mcu_status: Error" AND "[drm:gen6_sanitize_pm]
  *ERROR*"

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