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@@ -1,2 +1,38 @@
 # ubuntu-on-imac
 
+## 2011 IMAC
+
+### Disable startup chime
+
+The startup chime volume is controlled by the EFI variable SystemAudioVolume-7c436110-ab2a-4bbb-a880-fe41995c9f82. So it can be muted with
+
+```
+printf "\x07\x00\x00\x00\x00" > /sys/firmware/efi/efivars/SystemAudioVolume-7c436110-ab2a-4bbb-a880-fe41995c9f82
+```
+
+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:
+
+```
+chattr -i /sys/firmware/efi/efivars/SystemAudioVolume-7c436110-ab2a-4bbb-a880-fe41995c9f82
+```
+
+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. 
+
+### Fix screen brightness adjust
+
+Edit /etc/default/grub and modify the GRUB command line to include the following
+```
+GRUB_CMDLINE_LINUX_DEFAULT="pcie_aspm=force acpi_backlight=native"
+```
+
+Rebuild GRUB menu afterwards
+```
+update-grub
+```
+
+### Install mbp fan controll
+
+```
+apt install mbpfan
+systemctl enable mbpfan
+```