[Bug 98832] New: Distorted colours after suspend / resume cycle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98832

            Bug ID: 98832
           Summary: Distorted colours after suspend / resume cycle
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
               URL: https://bugs.launchpad.net/bugs/1643843
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: glogow at fbihome.de
        QA Contact: xorg-team at lists.x.org

When waking up the system from a suspend-resume cycle, the display most times
shows distorted colours.
As a workaround one can switch to the linux console (VT) and back to fix the
display.
Alternatively triggering DPMS also fixes the problem (xset dpms force off ;
sleep 0.1; xset dpms force on)

Hardware:
 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
 Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
 PCIID: 1002:6779

I've tested Ubuntu Xenial (16.04) with the latest updates and Ubuntu Trusty
(14.04) with various HWE stacks. Full history of the triage is in the Ubuntu
bug.

In the end I did a bisecting between the broken v4.1.3 and the fixed v4.1.4
kernel, as bisecting between v4.1 and v4.2 didn't find a fixed kernel. Probably
I should run an other bisect between v4.0 and v4.1 to find the commit which
really broke it.

$ git bisect log
# bad: [89e419960fb6a260f6a112821507d516117d5aa1] Linux 4.1.4
# good: [c8bde72f9af412de57f0ceae218d648640118b0b] Linux 4.1.3
git bisect start 'v4.1.4' 'v4.1.3'
# good: [e0cf83cc3de0341d8cabbb23097ad85f5ce97a11] drm/qxl: Do not leak memory
if qxl_release_list_add fails
git bisect good e0cf83cc3de0341d8cabbb23097ad85f5ce97a11
# bad: [9d680e03989324f000596be4862728a7c30f22c1] selinux: don't waste ebitmap
space when importing NetLabel categories
git bisect bad 9d680e03989324f000596be4862728a7c30f22c1
# bad: [510c99974fdbc18f143c41cbd461c522f5ad7164] tpm, tpm_crb: fix le64_to_cpu
conversions in crb_acpi_add()
git bisect bad 510c99974fdbc18f143c41cbd461c522f5ad7164
# bad: [8b941a43ea7709111d3cbea2bdfcc678975255da] drm/radeon: only check the
sink type on DP connectors
git bisect bad 8b941a43ea7709111d3cbea2bdfcc678975255da
# good: [0f2bb042f21bdb28f20efcf1ff1c507e2f8b3caa] drm/i915: Declare the
swizzling unknown for L-shaped configurations
git bisect good 0f2bb042f21bdb28f20efcf1ff1c507e2f8b3caa
# good: [1f977d7e942519127aea0a08e9d08437b363cf19] drm/i915: Use two 32bit
reads for select 64bit REG_READ ioctls
git bisect good 1f977d7e942519127aea0a08e9d08437b363cf19
# good: [7b49262b642511a16699cc63cf2a716739f0c43f] drm/radeon: SDMA fix
hibernation (CI GPU family).
git bisect good 7b49262b642511a16699cc63cf2a716739f0c43f
# bad: [d1a4362d41e4feb52df6464f70fb64f21b894623] Revert "drm/radeon: dont
switch vt on suspend"
git bisect bad d1a4362d41e4feb52df6464f70fb64f21b894623
# first bad commit: [d1a4362d41e4feb52df6464f70fb64f21b894623] Revert
"drm/radeon: dont switch vt on suspend"

Just remember that good and bad is inverted, as I was looking for the commit
which fixes my colour problem in v4.1.4. For me it fixes more then just the
cursor, which I also saw breaking.

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