[Bug 79146] New: i3-3227U's HD4000 fails to work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79146

          Priority: medium
            Bug ID: 79146
          Assignee: chris at chris-wilson.co.uk
           Summary: i3-3227U's HD4000 fails to work
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: etkids at 163.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

The model of my laptop is Acer V7-481 which comes with an [B]i3-3227U[/B] CPU
and [B]NO[/B] graphic card.

When I was installing ubuntu 12.04 for the first time, the laptop booted up in
a black screen

The only solution to this is to add a boot parameter nomodeset or something to
disable the KMS.

Other solutions I found are useless, including acpi related and adjust the
backlight using shortcuts etc.


Now, my laptop can ONLY boot with NOMODESET but I don't think the integrated
graphic card is functioning normally.

NOTE:This happens on distros that doesn't have a GUI

1. I cannot connect to a second monitor via HDMI and Display Port
2. unity is running in 2d mode
3. can't use 3d hardware acceleration
4. cannot change backlight with shortcuts

The back light is on without nomodeset and can be adjusted by keyboard shortcut

however, with nomodest, I can't change the back light.

out put of `uname -a`

`Linux v7 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64
x86_64 x86_64 GNU/Linux`

out put of `lshw -c video`

```
*-display UNCLAIMED     
   description: VGA compatible controller
   product: 3rd Gen Core processor Graphics Controller
   vendor: Intel Corporation
   physical id: 2
   bus info: pci at 0000:00:02.0
   version: 09
   width: 64 bits
   clock: 33MHz
   capabilities: msi pm vga_controller bus_master cap_list
   configuration: latency=0
   resources: memory:c0000000-c03fffff memory:b0000000-bfffffff
ioport:3000(size=64)
```

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