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albright
Advocate
Joined: 16 Nov 2003
Posts: 2588
Location: Near Toronto
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 Posted: Wed Mar 21, 2018 12:27 pm Post subject: load module parameters i915 |
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I thought I knew how to do this
I want to try "enable_guc_loading=1 enable_guc_submission=1"
on my skyake i7-6600U
so I change /etc/conf.d/modules to include:
| Quote: | modules="i915"
module_i915_args="enable_guc_loading=1 enable_guc_submission=1" |
But after rebooting I have
| Code: | systool -vm i915
....
enable_guc_loading = "0"
enable_guc_submission= "0"
...
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So what have I done wrong?
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albright
Advocate
Joined: 16 Nov 2003
Posts: 2588
Location: Near Toronto
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| Posted: Wed Mar 21, 2018 12:49 pm Post subject: |
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sorry to reply to myself but adding boot parameters
enables these features
perhaps the i915 module loads too early for /etc/conf.d/modules
to have any effect ??? I'm still curious ...
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pilla
Bodhisattva
Joined: 07 Aug 2002
Posts: 7729
Location: Underworld
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| Posted: Wed Mar 21, 2018 2:15 pm Post subject: |
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From Arch's wiki:
| Quote: | For Skylake and newer processors, some video features (e.g. CBR rate control on SKL low-power encoding mode) may require the use of an updated GPU firmware, which is currently (as of 4.14) not enabled by default.
It is necessary to add i915.enable_guc_loading=1 i915.enable_guc_submission=1 to the kernel parameters to enable it. Alternatively, if the initramfs already includes the i915 module (see Kernel mode setting#Early KMS start), you can set these options through a file in /etc/modprobe.d/ |
So I would say yes, either add it as kernel parameters or fix initramfs.
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