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Message #130791
[Bug 1483320] Re: Migrate Broadwell to use i915_bpo
Here is the dmesg output for 201409-15487 (BIOS A07) with cycling
through all 4 modes, with "drm.debug=14 log_buf_len=500k" added into
GRUB_CMDLINE_LINUX_DEFAULT= of /etc/default/grub
** Attachment added: "dmesg-drm-debug-201409-15487.log"
https://bugs.launchpad.net/ubuntu/vivid/+source/linux/+bug/1483320/+attachment/4444028/+files/dmesg-latest.log
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https://bugs.launchpad.net/bugs/1483320
Title:
Migrate Broadwell to use i915_bpo
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Vivid:
In Progress
Bug description:
There are several bugs affecting Broadwell generation graphics in the
vivid kernel (3.19), but not found in 4.2rc which i915_bpo module is
based on. In order to support our OEM partners (and other BDW users)
it would make sense to migrate BDW to use i915_bpo instead.
The known (public) bugs this would fix are:
- screen is black after xrandr rotate command
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1446979
- changing the VT causes flicker
https://bugs.freedesktop.org/show_bug.cgi?id=85583
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1450557
- GPU hangs on resume
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1468232
(and dupes, which I believe there are several of)
- and some OEM machines can't always hotplug the HDMI output (no
public bug AIUI)
the migration should not be too risky, since i915_bpo is already used
for Braswell which is same generation as (=based on) BDW.
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References