Dell Latitude E7270

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

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

Frozen CPU Frequency Scaling

If you experience 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.
gollark: ```c#include <stdio.h>typedef union { float apio; int apiobee; char apioform[22];} ApioData;int main() { ApioData data; data.apio = 3.0; printf("%d %s", data.apiobee, data.apioform);}```
gollark: What an apiological feature.
gollark: ```c#include <stdio.h>typedef union { float apio; int apiobee; char apioform[22];} ApioData;int main() { ApioData data; data.apio = 3.0; printf("%d", data.apiobee);}```
gollark: Wondrous. Such safety.
gollark: ```c#include <stdio.h>union ApioData { float apio; int apiobee; char apioform[22];} ;int main() { union ApioData data; data.apio = 3.0; printf("%d", data.apiobee);}```
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