Bug 89804 - Haswell i915 kernel drm driver reports 2G usable VRAM, system specifation reports 4G available.
Summary: Haswell i915 kernel drm driver reports 2G usable VRAM, system specifation rep...
Status: CLOSED NOTABUG
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: x86 (IA32) Linux (All)
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-03-28 20:03 UTC by SMF
Modified: 2015-03-29 08:59 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

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Description SMF 2015-03-28 20:03:20 UTC 
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.
Comment 1 Chris Wilson 2015-03-29 01:25:44 UTC 
That is a message from the Intel driver describing the limits of the Intel GPU's GTT. Ideally those messages should have [i915] prefixes (or [drm/i915]).
Comment 2 SMF 2015-03-29 08:59:35 UTC 
Thanks for the explanation.

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