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# Dell Latitude E7270

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Hardware | PCI/USB ID | Working?
--- | --- | ---
Touchpad |  | Yes
Keyboard |  | Yes
Integrated GPU |  | Yes
Webcam | `0bda:5686` | Yes
Ethernet |  | Yes
Bluetooth | `8087:0a2b` | Untested
SD-card reader |  | Untested
Audio | `8086:9dc8` | Yes
Wi-Fi | `8087:0a2b` | Yes
Fingerprint reader | `0a5c:5834` | No
TPM |  | Untested

## Sound

Audio output via the headphone port does not work if the microphone is muted when the laptop is started. Unmuting the microphone fixes the issue, it can be savely muted afterwards.

## Display

This article or section is being considered for removal.

Reason: The bug was, according to its report, fixed in 2018. This section was added in 2017 (470940). It is very likely that the bug no longer exists. (Discuss in Talk:Dell Latitude E7270)

According to

    $ cat /sys/kernel/debug/dri/0/i915_edp_psr_status

    Sink_Support: yes
    Source_OK: no
    Enabled: no
    Active: no
    Busy frontbuffer bits: 0x000
    Re-enable work scheduled: no
    Main link in standby mode: no
    HW Enabled & Active bit: no

The FullHD panel supports psr, but the i915 psr implementation for skylake has known bugs.

## Function keys

Key | Visible?1 | Marked?2 | Effect
--- | --- | --- | ---
`Fn+Esc` | No | Yes | Toggles Fn lock
`Fn+F1` | Untested | Yes | `XF86AudioMute`
`Fn+F2` | Untested | Yes | `XF86AudioLowerVolume`
`Fn+F3` | Untested | Yes | `XF86AudioRaiseVolume`
`Fn+F4` | Untested | Yes | `XF86AudioMuteVolume`
`Fn+F5` | Untested | Yes | `XF86AudioMicMute`
`Fn+F6` | Untested | Yes | ``
`Fn+F7` | No | No | `Blank`
`Fn+F8` | Untested | Yes | `?`
`Fn+F9` | Untested | Yes | `XF86Search`
`Fn+F10` | No | Yes | `Keyboard backlight`
`Fn+F11` | Untested | Yes | `XF86MonBrightnessDown`
`Fn+F12` | Untested | Yes | `XF86MonBrightnessUp`
`Fn+PrtScr` | No | Yes | `RfKill`
`Fn+Insert` | No | Yes | `sleep`

## Frozen CPU frequency scaling

If you experience CPU frequency scaling freezing, i.e. your cpu stays at the lowest idle frequency follow these steps:

1. shutdown your laptop
2. remove back cover
3. unplug battery
4. hold power button for 20s (Count to 40 to be sure)
5. replug battery
6. attach back cover
7. start laptop and retest

See also FS#56866.

## What does not work

- Fingerprint Reader (0a5c:5834)
- DW5811e stops working after suspend, presumably the UEFI does initial configuration, needs more testing
  - Per LKML runtime power management does not work for the chip (EM7455) used in the DW5811e, disabling runtime pm and reseting the device makes it usable.

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