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Message #134630
[Bug 1483320] Re: [BDW] VGA output regression on 4.2 (was: Migrate Broadwell to use i915_bpo)
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
vivid' to 'verification-done-vivid'.
If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!
** Tags added: verification-needed-vivid
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https://bugs.launchpad.net/bugs/1483320
Title:
[BDW] VGA output regression on 4.2 (was: Migrate Broadwell to use
i915_bpo)
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Vivid:
Fix Committed
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.
UPDATE:
Track VGA output regression here, found in 4.2 and fixed upstream by
commit 6fa2d197936ba0b8936e813d0adecefac160062b
Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@xxxxxxxxx>
Date: Mon Aug 31 11:23:28 2015 +0300
i915: Set ddi_pll_sel in DP MST path
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