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Update hdmi_cec.markdown (#1915)

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If we follow the instructions on raspberry, the install path is different after a manual build.
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RunOnGitHub 2017-01-30 15:00:11 +01:00 committed by Fabian Affolter
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source/_components/hdmi_cec.markdown
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@ -39,6 +39,13 @@ For the default virtual environment of a [Raspberry Pi All-In-One installation](
$ ln -s /usr/local/lib/python3.4/dist-packages/cec /srv/hass/hass_venv/lib/python3.4/site-packages
```
For the default virtual environment of a [Manual installation](/getting-started/installation-raspberry-pi/) the command would be as follows.
```bash
$ ln -s /usr/local/lib/python3.4/site-packages/cec /srv/hass/hass_venv/lib/python3.4/site-packages
```
<p class='note'>If after symlinking and adding `hdmi_cec:` to your configuration you are getting the following error in your logs,
`* failed to open vchiq instance` you will also need to add the user account Home Assistant runs under, to the `video` group. To add the Home Assistant user account to the `video` group, run the following command. `$ usermod -a -G video <hass_user_account>`
</p>