[Bug 95741] Broadwell graphics on Dell XPS13 (early 2015) loses horizontal sync on shift to tty console

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=95741

nils.alex at linux.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nils.alex at linux.com

--- Comment #10 from nils.alex at linux.com ---
Hi, I experience the same problem. I did a bisect today:

git bisect start '--' 'drivers/gpu/drm/i915'
# good: [19583ca584d6f574384e17fe7613dfaeadcdc4a6] Linux 3.16
git bisect good 19583ca584d6f574384e17fe7613dfaeadcdc4a6
# bad: [bfa76d49576599a4b9f9b7a71f23d73d6dcff735] Linux 3.19
git bisect bad bfa76d49576599a4b9f9b7a71f23d73d6dcff735
# bad: [a12624959ad4e3bfa8c344ad71728ffc9a379158] drm/i915: Update DRIVER_DATE
to 20140905
git bisect bad a12624959ad4e3bfa8c344ad71728ffc9a379158
# bad: [6d93c0c41760c018ca02bf4c9164b9fda2184670] drm/i915: fix VDD state
tracking after system resume
git bisect bad 6d93c0c41760c018ca02bf4c9164b9fda2184670
# good: [ea0c76f8c306716a301abbf28699c4ca0a102bed] drm/i915: Emphasize that
ctx->obj & ctx->is_initialized refer to the legacy rcs ctx
git bisect good ea0c76f8c306716a301abbf28699c4ca0a102bed
# good: [eeefa889cddb8d7e4ee6ce0212e685dd624d66a1] drm/i915: Remove redundant
HAS_PSR checks
git bisect good eeefa889cddb8d7e4ee6ce0212e685dd624d66a1
# good: [b98856a86b0a44ef9d0ab61f6855baf6d941fe6f] drm/i915: Replace
HAS_PCH_SPLIT which incorrectly lets some platforms in
git bisect good b98856a86b0a44ef9d0ab61f6855baf6d941fe6f
# good: [11bed958b72e15fd12d78c30ce49047b94817840] drm/i915: mst topology
dumper in debugfs (v0.2)
git bisect good 11bed958b72e15fd12d78c30ce49047b94817840
# good: [4dac3edfe68e5e1b3c2216b84ba160572420fa40] Merge remote-tracking branch
'airlied/drm-next' into drm-intel-next
git bisect good 4dac3edfe68e5e1b3c2216b84ba160572420fa40
# good: [72b79c9b2f1b23ba63d7e215963fb90475286ff1] drm/i915: Update DRIVER_DATE
to 20140725
git bisect good 72b79c9b2f1b23ba63d7e215963fb90475286ff1
# good: [1381308bb1e24fd7906eab3f046654041546cce3] drm/i915: wait for all DSI
FIFOs to be empty
git bisect good 1381308bb1e24fd7906eab3f046654041546cce3
# bad: [f573de5a8474ae2cfc28424423c5a68c780a904b] drm/i915: Add correct hw/sw
config check for DSI encoder
git bisect bad f573de5a8474ae2cfc28424423c5a68c780a904b
# bad: [aba86890a1785d787bfe7a741f910a472280540a] drm/i915: factor out
intel_edp_panel_vdd_sanitize
git bisect bad aba86890a1785d787bfe7a741f910a472280540a
# first bad commit: [aba86890a1785d787bfe7a741f910a472280540a] drm/i915: factor
out intel_edp_panel_vdd_sanitize

At first I believed that I have found the bad commit, BUT then, unfortunately,
the problem occured in the latest working commit (according to the above
bisect) as well. It is just occuring rarely around these commits. I yet have to
find a working version. Next I tried 3.14, which again behaves very badly (just
like 4.0).

Note that during the bisect I started to encouter a different problem: The
screen startet to flicker horizontally, sometimes more, sometimes less, which
made it hard to decide whether this commit is actually good or bad when trying
to resolve the problem at hand.

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