Intel HD Graphics on Core i5 notebook - DP port doesnt goes back from power save.

[idata]

I have an Lenovo L412 notebook with Display Port connection to the NEC EA231WMi LCD Monitor with the 1920x1080 resolution.

Then display goes to power save (configured on notebook), it doesn't goes back after user activity cause wake up. Monitor goes from power save, senses some activity on DP, and flickers sometimes, but no image displayed.

The reconnection of DP connector solves the issue. With the previous driver version (8.15.10.2125) reconnection didn't help.

The information on system and GMA configuration follows:

Intel® HD Graphics (Core i5) Report Date: 1/1/2011Report Time[hr:mm:ss]: 13:4:42Driver Version: 8.15.10.2246Operating System: Windows 7 (6.1.7600)Default Language: Russian (Russia)DirectX* Version: 10.1Physical Memory: 3892 MBMinimum Graphics Memory: 32 MBMaximum Graphics Memory: 1696 MBGraphics Memory in Use: 75 MBProcessor: Intel64 Family 6 Model 37 Stepping 5Processor Speed: 2394 MHzVendor ID: 8086Device ID: 0046Device Revision: 02 * Accelerator Information * Accelerator in Use: Intel(R) HD GraphicsVideo BIOS: 2026.0Current Graphics Mode: 1920 by 1080 * Devices Connected to the Graphics Accelerator * Active Digital Televisions: 1Non Active Notebook Displays: 1* Digital Television * Monitor Name: Универсальный монитор PnPDisplay Type: DigitalGamma Value: 2,2DDC2 Protocol: Supported Maximum Image Size:Horizontal: 20,08 inchesVertical: 11,42 inches Monitor Supported Modes:640 by 480 (67 Hz)640 by 480 (75 Hz)640 by 480 (72 Hz)640 by 480 (60 Hz)720 by 400 (70 Hz)800 by 600 (72 Hz)800 by 600 (75 Hz)800 by 600 (56 Hz)800 by 600 (60 Hz)832 by 624 (75 Hz)1024 by 768 (75 Hz)1024 by 768 (70 Hz)1024 by 768 (60 Hz)1152 by 870 (75 Hz)1280 by 1024 (60 Hz)1280 by 720 (60 Hz)1280 by 960 (60 Hz)1280 by 1024 (75 Hz)1280 by 800 (60 Hz)1400 by 1050 (60 Hz)1440 by 900 (60 Hz)1600 by 900 (60 Hz)1680 by 1050 (60 Hz)1920 by 1080 (60 Hz) Display Power Management Support:Standby Mode: SupportedSuspend Mode: SupportedActive Off Mode: Supported Raw EDID:00 FF FF FF FF FF FF 00 38 A3 7A 67 00 00 00 00 1F 14 01 04 A5 33 1D 78 E2 F8 05 A4 55 4D 9D 25 12 50 54 BF EF 80 81 00 81 40 81 80 81 C0 95 00 90 40 B3 00 A9 C0 02 3A 80 18 71 38 2D 40 58 2C 45 00 FE 1F 11 00 00 1E 00 00 00 FD 00 38 4C 1F 53 11 00 0A 20 20 20 20 20 20 00 00 00 FC 00 45 41 32 33 31 57 4D 69 0A 20 20 20 20 00 00 00 FF 00 30 38 30 30 34 38 30 32 4E 42 0A 20 20 01 E9 02 03 17 C1 4A 90 05 04 03 07 1F 14 13 12 16 23 09 07 07 83 01 00 00 01 1D 00 72 51 D0 1E 20 6E 28 55 00 FE 1F 11 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 FE 1F 11 00 00 18 8C 0A D0 90 20 40 31 20 0C 40 55 00 FE 1F 11 00 00 18 01 1D 80 18 71 1C 16 20 58 2C 25 00 FE 1F 11 00 00 9E 02 3A 80 D0 72 38 2D 40 10 2C 45 80 FE 1F 11 00 00 1E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 21 * Built-in Display * Monitor Name: ThinkPad Display 1366x768Display Type: DigitalGamma Value: 2,2DDC2 Protoc...