[Bug 89804] New: Haswell i915 kernel drm driver reports 2G usable VRAM, system specifation reports 4G available.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89804

            Bug ID: 89804
           Summary: Haswell i915 kernel drm driver reports 2G usable VRAM,
                    system specifation reports 4G available.
           Product: DRI
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: smf.linux at ntlworld.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Linux kernel (3.19.3 32bit pae) reports 2Gbyte of usable VRAM avaiable, the
system (a Lenovo Z50-70 with Intel/Nvidia hybid graphics) is specified as
having 4Gbyte in the laptops's literature, is there an explanation for this
difference ?

[    0.669916] [drm] Initialized drm 1.1.0 20060810
[    0.670407] [drm] Memory usable by graphics device = 2048M
[    0.670492] [drm] Replacing VGA console driver
[    0.689830] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    0.689837] [drm] Driver supports precise vblank timestamp query.
[    0.738130] fbcon: inteldrmfb (fb0) is primary device
[    0.739339] [drm] Initialized i915 1.6.0 20141121 for 0000:00:02.0 on minor
0
[    1.831847] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device

thanks.

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