[Bug 102224] Screen does not wake after screen blank

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102224

--- Comment #1 from arkh4mkn1ght at gmail.com ---
After updating the BIOS of my laptop to the latest version and Upgrading to
Kernel 4.12.4 i'm still experiencing the issue. Same message in the logs:

Aug 06 11:26:02 localhost.localdomain kernel: [drm:i915_gem_idle_work_handler
[i915]] *ERROR* Timeout waiting for engines to idle

Screen is blank, unable to unblank it, keys when pressed are lit for a moment
and then turn off, unable to ssh into the machine though login asks for the
password.

This is definitely a bug in i915 rc6 support. Just in case my VAIO Z flip is
using a skylake CPU:

model name      : Intel(R) Core(TM) i7-6567U CPU @ 3.30GHz

Kernel:

[root at localhost]# uname -a
Linux localhost.localdomain 4.12.4 #1 SMP Sat Aug 5 11:00:30 UYT 2017 x86_64
x86_64 x86_64 GNU/Linux


i915 module parameters used:

[root at localhost ]# systool -vm i915
Module = "i915"

  Attributes:
    coresize            = "1277952"
    initsize            = "0"
    initstate           = "live"
    refcnt              = "21"
    srcversion          = "9F705B72B03F193BC3EF19B"
    taint               = ""
    uevent              = <store method only>

  Parameters:
    alpha_support       = "N"
    disable_display     = "N"
    disable_power_well  = "1"
    edp_vswing          = "0"
    enable_cmd_parser   = "Y"
    enable_dc           = "-1"
    enable_dp_mst       = "Y"
    enable_dpcd_backlight= "N"
    enable_execlists    = "1"
    enable_fbc          = "0"
    enable_guc_loading  = "0"
    enable_guc_submission= "0"
    enable_gvt          = "N"
    enable_hangcheck    = "Y"
    enable_ips          = "1"
    enable_ppgtt        = "3"
    enable_psr          = "1"
    enable_rc6          = "1"
    error_capture       = "Y"
    fastboot            = "N"
    force_reset_modeset_test= "N"
    guc_firmware_path   = "(null)"
    guc_log_level       = "-1"
    huc_firmware_path   = "(null)"
    inject_load_failure = "0"
    invert_brightness   = "0"
    load_detect_test    = "N"
    lvds_channel_mode   = "0"
    lvds_use_ssc        = "-1"
    mmio_debug          = "0"
    modeset             = "-1"
    nuclear_pageflip    = "N"
    panel_ignore_lid    = "1"
    prefault_disable    = "N"
    reset               = "Y"
    semaphores          = "0"
    use_mmio_flip       = "0"
    vbt_sdvo_panel_type = "-1"
    verbose_state_checks= "Y"

Again setting i915.emable_rc6 to 0 is NOT an option as it destroys battery
life. I hope this bug can be fixed cause its been a long time since i915 rc6
bugs have been around for skylake and kabylake CPU. I'm currently testing some
i915 module parameters and i will report back if the problem appears again

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