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My Laptop is HP DV6-7023tx specifications are below My problem is I cannot enable HD4000 I have to give boot arg Graphicsenabler=No and IGPenabler=Yes unless the screen is going dark.Can enyone please help me? thanks in advance. I'm very sorry for my bad English. Im a Sri Lankan. Specs: Microprocessor 2.3 GHz Intel Core i7-3610QM Microprocessor Cache 6 MB L3 Cache Memory 16 GB 1366 MHz DDR3 Memory Max 2 user accessible slots Video Graphics NVIDIA GeForce GT 630M Video Memory 2 GB DDR3 dedicated Hard Drive 750 GB SATA (5400 rpm) Multimedia Drive Blu ray Drive Display 15.6" diagonal HD BrightView LED-backlit Display (1366 x 768) Network Card Integrated 10/100/1000 Gigabit Ethernet LAN (RJ-45 connector) Wireless Connectivity 802.11b/g/n Bluetooth Sound 4 x Beats Audio Internal speakers Beats Audio Audio playback HP Triple Bass Reflex Subwoofer Keyboard Full-sized island-style keyboard with integrated numeric keypad Pointing Device TouchPad with on/off button and support for multitouch gestures PC Card Slots Multi-Format Digital Media Card Reader for Secure Digital cards & Multimedia cards External Ports 3 SuperSpeed USB 3.0 1 USB 2.0 1 HDMI 1 VGA 1 RJ45 1 Headphone-out 1 Microphone-in Dimensions 37.8 x 24.7 x 3.25 cm Weight Starting at 2.57 kg Security HP SimplePass Fingerprint Reader Kensington MicroSaver lock slot Power-on password Accepts 3rd party security lock devices Power 120W slim AC Power Adapter 6-cell Lithium-Ion (Li-Ion) ID Mech Description HP TrueVision HD Webcam with integrated dual array digital microphone (High Definition low-light) Im attaching dsdt file that extarted from AIDA64 in windows 7 acpi_dsdt.rar