[Bug 88975] New: Log Message Spamming - "Reducing the compressed framebuffer size..."

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88975

            Bug ID: 88975
           Summary: Log Message Spamming - "Reducing the compressed
                    framebuffer size..."
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: cwawak at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

OS: Fedora 21
Kernel: Linux system 3.18.3-201.fc21.x86_64 #1 SMP Mon Jan 19 15:59:31 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux

Hardware: 2014 Lenovo Thinkpad X1 Carbon, HiDPI screen
Chipset: 00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT
Integrated Graphics Controller (rev 0b)
DRI driver: i965
libdrm-2.4.58-3.fc21.x86_64

Issue: 
When I enable FBC via kernel command line options (i915.enable_fbc=1), I
noticed the following message spam ~30 times a second, every second to my
journal:

[drm] Reducing the compressed framebuffer size. This may lead to less power
savings than a non-reduced-size. Try to increase stolen memory size if
available in BIOS.

This log messages seems to have come in here:
https://freedesktop.org/patch/28264/

When I remove that command line option, the log message goes away.

Expected behavior:
Having only one occurance of this log message on boot seems like plenty of
information to let me know that I am not getting quite the compression or power
savings that I would get if I could increase stolen memory size (I looked
through the BIOS, it appears that I can't, even after increasing the video
memory reservation to 512MB from 256MB).

Is there a particular reason why this message is spammed hundreds of times a
minute? Is it possible that a change be made to reduce this log spam, which
seems like it could affect battery life?

Thanks!

Chris

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