Ubuntu
linux package

  1. Vivid (15.04)
  2. Bug #1483320
  3. Comment #6

Comment 6 for bug 1483320

Revision history for this message
Po-Hsu Lin (cypressyew) wrote : Re: Migrate Broadwell to use i915_bpo

201408-15387 Dell Latitude E7250, a Broadwell-U UMA system [8086:1616]
With kittyhawk 2.0 image (3.19.0-26 #27), I can reproduce the following issues:
1. Normal <-> 180 display rotation, it would cause black screen.
2. VT switch, the screen will flick and the *ERROR* message could be found in dmesg
3. Resume from S3, you can see the screen before suspend, and GPU hang error message could be found in dmesg

However, I can't 100% reproduce the HDMI hot plug issue. Only 1 out of 10.

Test result:
With the kernel provided in #4 (tested with 3.19.0-26-generic_3.19.0-26.27+bpo0.2_amd64), all these issues are gone (HDMI hot plug works as expected too).
But:
* Call trace for i915_bpo could be found on boot in dmesg output
* Call trace for i915_bpo could be found after connecting the HDMI cable
* Call trace for i915_bpo could be found after connecting the DP cable
* HDMI audio and DP audio are not working

Please find the attachment for the detailed logs.

For more information about the test cases, please refer to this private test report:
https://certification.canonical.com/hardware/201408-15387/submission/105457/