* [drm] Reducing the compressed framebuffer size
@ 2020-05-12 13:36 Massimo B.
2020-05-13 12:29 ` Ville Syrjälä
0 siblings, 1 reply; 2+ messages in thread
From: Massimo B. @ 2020-05-12 13:36 UTC (permalink / raw)
To: dri-devel
Hello everybody,
since Kernel 5.6.5 I encounter many syslog lines like
[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 some 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
# cat /etc/modprobe.d/i915.conf
options i915 enable_fbc=0
After reboot the setting seems active:
# 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? Is there a better place to ask?
# lspci |grep VGA
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)
# grep name /proc/cpuinfo |tail -n1
model name : Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz
Best regards,
Massimo
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dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [drm] Reducing the compressed framebuffer size
2020-05-12 13:36 [drm] Reducing the compressed framebuffer size Massimo B.
@ 2020-05-13 12:29 ` Ville Syrjälä
0 siblings, 0 replies; 2+ messages in thread
From: Ville Syrjälä @ 2020-05-13 12:29 UTC (permalink / raw)
To: Massimo B.; +Cc: dri-devel
On Tue, May 12, 2020 at 03:36:01PM +0200, Massimo B. wrote:
> Hello everybody,
>
> since Kernel 5.6.5 I encounter many syslog lines like
>
> [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 some 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?
FBC is a thing for all platform generations.
>
> Anyway I followed the hint and set
>
> # cat /etc/modprobe.d/i915.conf
> options i915 enable_fbc=0
>
> After reboot the setting seems active:
>
> # 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? Is there a better place to ask?
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
But it's a bit strange you still get it with fbc disabled. The logic
for when to allocate the cfb may be a bit busted atm...
>
> # lspci |grep VGA
> 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)
>
> # grep name /proc/cpuinfo |tail -n1
> model name : Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz
>
> Best regards,
> Massimo
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Ville Syrjälä
Intel
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
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2020-05-12 13:36 [drm] Reducing the compressed framebuffer size Massimo B.
2020-05-13 12:29 ` Ville Syrjälä
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