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Intel, reducing compressed freamebuffer size
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Massimo B.
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PostPosted: Thu Apr 23, 2020 5:24 am    Post subject: Intel, reducing compressed freamebuffer size Reply with quote

Hello everybody,

since 5.6.5-gentoo I encounter many syslog lines like
Code:
[kernel] [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.
                - Last output repeated 4 times -

I found the explanation at https://wiki.archlinux.org/index.php/intel_graphics#Framebuffer_compression_(enable_fbc).
But why do I get this with a i7-4790 Haswell, which is not pre-Sandy?
Anyway I followed the hint and set
Code:
# cat /etc/modprobe.d/i915.conf
options i915 enable_fbc=0

After reboot the setting seems active:
Code:
# cat /sys/module/i915/parameters/enable_fbc
0

But I still get the same logs. Which BIOS setting is responsible, how can I fix that?
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Massimo B.
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PostPosted: Fri May 08, 2020 9:22 am    Post subject: Reply with quote

Where can I ask about that issue? kernel.org or rather x.org?
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mxfm
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PostPosted: Fri May 08, 2020 7:49 pm    Post subject: Reply with quote

Massimo B. wrote:
Where can I ask about that issue? kernel.org or rather x.org?


This is definitely more related to kernel than to X.
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Massimo B.
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PostPosted: Thu May 14, 2020 6:14 am    Post subject: Reply with quote

There is a patch on its way somewhere to linus/stable trees to eliminate this dmesg spam:
https://cgit.freedesktop.org/drm-intel/commit/?id=6b7fc6a3e6af4ff5773949d0fed70d8e7f68d5ce
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