[Bug 99311] [regression, radeonsi] Updating to 1edc53a66b breaks SDDM (white screen on launch)

[Bug 99311] [regression, radeonsi] Updating to 1edc53a66b breaks SDDM (white screen on launch)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=99311

            Bug ID: 99311
           Summary: [regression,radeonsi] Updating to 1edc53a66b breaks
                    SDDM (white screen on launch)
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Keywords: regression
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: kai@dev.carbon-project.org
        QA Contact: dri-devel@lists.freedesktop.org

Somewhere between c93efb0a4f and 1edc53a66b a regression was introduced,
causing SDDM launching into a pure white screen instead of the login screen.
There's nothing logged to either /var/log/Xorg.0.log or /var/log/sddm.log and
dmesg is also clear. Downgrading to c93efb0a4f lets me login again.

I have not bisected yet, but maybe this information is already enough to find
the cause. For the full stack affected by this regression, please see below.

GPU: Hawaii PRO [Radeon R9 290] (ChipID = 0x67b1)
Mesa: Git:master/1edc53a66b + the modified version of attachment 127812
libdrm: 2.4.74-1
LLVM: SVN:trunk/r291276 (4.0 devel) +
<https://reviews.llvm.org/D26348?download=true>
X.Org: 2:1.19.0-3
Linux: 4.9.1
Firmware: 20161130-2
libclc: Git:master/b906699f68
DDX (amdgpu): 1.2.0-1+b1

Let me know, if you need anything else (besides a bisect).

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[Bug 99311] [regression, bisected, core] Updating to 1edc53a66b breaks SDDM (white screen on launch)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=99311

Kai <kai@dev.carbon-project.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Drivers/Gallium/radeonsi    |Mesa core
                 CC|                            |kenneth@whitecape.org
            Summary|[regression,radeonsi]       |[regression,bisected,core]
                   |Updating to 1edc53a66b      |Updating to 1edc53a66b
                   |breaks SDDM (white screen   |breaks SDDM (white screen
                   |on launch)                  |on launch)
           Keywords|                            |bisected
         QA Contact|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
           Assignee|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org

--- Comment #1 from Kai <kai@dev.carbon-project.org> ---
Ok, I finished the bisection:
8b5749f65ac434961308ccb579fb8a816e4f29d5 is the first bad commit
commit 8b5749f65ac434961308ccb579fb8a816e4f29d5
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Sun Nov 15 04:37:50 2015 -0800

    glsl: Override the # of varying slots for ClipDistance and TessLevel*.

    Right now, this shouldn't have any effect, as all drivers use
    LowerClipDist and LowerTessFactors to turn the float[] arrays into
    vectors.

    However, it should help make it possible for drivers to avoid that
    lowering.

    Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
    Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
    Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>

:040000 040000 1b29c9a54c33c8809e38f8fd99ea7dbb1935107e
5900d84fdc8d64a53dae3b7c4ac01be73b31c614 M      src

The bisection log is:
# bad: [1edc53a66b33e4d17688a3d03b1bdffed2aec414] glsl: fix opt_minmax
redundancy checks against baserange
# good: [c93efb0a4fd7dba8390e066605fe5f4c3e26e767] swr: [rasterizer core]
rename OutputMerger functions
git bisect start '1edc53a66b' 'c93efb0a4f'
# good: [6e7ce1ef55b138ed2cdedb40cbc010b523de8743] gallivm: generalize
4x4f->1x16ub special case conversion
git bisect good 6e7ce1ef55b138ed2cdedb40cbc010b523de8743
# bad: [e6ae19944d977dc91bc45adff679337182c20683] i965: Rework gl_TessLevel*[]
handling to use NIR compact arrays.
git bisect bad e6ae19944d977dc91bc45adff679337182c20683
# bad: [5c580e64cc206ab160e1767c42e4d6c81f67da4d] glsl: Mark whole variable
used for ClipDistance and TessLevel*.
git bisect bad 5c580e64cc206ab160e1767c42e4d6c81f67da4d
# good: [aead6a1e947af84b0af2853c204d5cad6d92bfff] gallium/radeon: use the
internal clear_buffer callback to fix r600g
git bisect good aead6a1e947af84b0af2853c204d5cad6d92bfff
# bad: [8b5749f65ac434961308ccb579fb8a816e4f29d5] glsl: Override the # of
varying slots for ClipDistance and TessLevel*.
git bisect bad 8b5749f65ac434961308ccb579fb8a816e4f29d5
# good: [6aa5cb34d03765b7be8611aa516bc201bd337f73] glsl: Create and use a new
ir_variable::count_attribute_slots() wrapper.
git bisect good 6aa5cb34d03765b7be8611aa516bc201bd337f73
# first bad commit: [8b5749f65ac434961308ccb579fb8a816e4f29d5] glsl: Override
the # of varying slots for ClipDistance and TessLevel*.

I verified this is really the first bad commit by building 1edc53a66b with
8b5749f65a reverted and that gave me a working SDDM again.

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