39 lines
1.1 KiB
Markdown
39 lines
1.1 KiB
Markdown
# ubuntu-on-imac
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## 2011 IMAC
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### Disable startup chime
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The startup chime volume is controlled by the EFI variable SystemAudioVolume-7c436110-ab2a-4bbb-a880-fe41995c9f82. So it can be muted with
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```
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printf "\x07\x00\x00\x00\x00" > /sys/firmware/efi/efivars/SystemAudioVolume-7c436110-ab2a-4bbb-a880-fe41995c9f82
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```
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Bear in mind that the file may have the immutable bit set by default, which will prevent even root from overwriting the file. See File permissions and attributes#File attributes. To remove it, issue the following:
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```
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chattr -i /sys/firmware/efi/efivars/SystemAudioVolume-7c436110-ab2a-4bbb-a880-fe41995c9f82
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```
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After that, run the printf command and it should overwrite the file properly. Verify the file's contents and then set the immutable bit again with chattr +i once satisfied.
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### Fix screen brightness adjust
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Edit /etc/default/grub and modify the GRUB command line to include the following
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```
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GRUB_CMDLINE_LINUX_DEFAULT="pcie_aspm=force acpi_backlight=native"
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```
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Rebuild GRUB menu afterwards
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```
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update-grub
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```
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### Install mbp fan controll
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```
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apt install mbpfan
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systemctl enable mbpfan
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```
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