Bug 89804

Summary:	Haswell i915 kernel drm driver reports 2G usable VRAM, system specifation reports 4G available.
Product:	DRI	Reporter:	SMF <smf.linux>
Component:	DRM/Intel	Assignee:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Status:	CLOSED NOTABUG	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	normal
Priority:	medium	CC:	intel-gfx-bugs
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

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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