(In reply to Artem S. Tashkinov from comment #0)
> It's actually a bug in i915 (because it manifests itself even when Xorg is
> _not_ running), so I'm not sure if this is the right bugzilla.

All Intel Graphics for Linux bugs should be reported here. Please also add the attachments here.

Created attachment 121443 [details]
ROM

As requested.

Created attachment 121444 [details]
drm.debug=14

Whenever I try to restart the Xorg server, the screen turns black and nothing can revive it.

lspci -vvv

00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated Graphics (rev 07) (prog-if 00 [VGA controller])
        Subsystem: Hewlett-Packard Company Device 80d1
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 128
        Region 0: Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
        Region 2: Memory at 90000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at 4000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [40] Vendor Specific Information: Len=0c <?>
        Capabilities: [70] Express (v2) Root Complex Integrated Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0
                        ExtTag- RBE+
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                        RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 128 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
                DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
        Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee00018  Data: 0000
        Capabilities: [d0] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [100 v1] #1b
        Capabilities: [200 v1] Address Translation Service (ATS)
                ATSCap: Invalidate Queue Depth: 00
                ATSCtl: Enable-, Smallest Translation Unit: 00
        Capabilities: [300 v1] #13
        Kernel driver in use: i915
        Kernel modules: i915

dmesg

[    0.000000] ACPI: UEFI 0x0000000087FFB000 000042 (v01 HPQOEM INSYDE   00000002 HP   00040000)
[    0.497363] Freeing initrd memory: 12724K (ffff88003f38e000 - ffff88003fffb000)
[    0.512878] efifb: probing for efifb
[    0.512897] efifb: framebuffer at 0x90000000, mapped to 0xffffc90001000000, using 8100k, total 8100k
[    0.512899] efifb: mode is 1920x1080x32, linelength=7680, pages=1
[    0.512899] efifb: scrolling: redraw
[    0.512901] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
[    0.517254] fb0: EFI VGA frame buffer device
[    0.868283]  [<ffffffff8106fb27>] ptdump_walk_pgd_level_core+0x307/0x450
[    1.196238] [drm] Initialized drm 1.1.0 20060810
[    1.305861] [drm] Memory usable by graphics device = 4096M
[    1.305867] fb: switching to inteldrmfb from EFI VGA
[    1.305988] [drm] Replacing VGA console driver
[    1.313025] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.313027] [drm] Driver supports precise vblank timestamp query.
[    1.353205] [drm] Initialized i915 1.6.0 20151010 for 0000:00:02.0 on minor 0
[    1.438671] fbcon: inteldrmfb (fb0) is primary device
[    2.653678] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    2.716751] [drm] RC6 on
[   10.437882] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])

As far as I can see it's a eDP connection.

Strangely the module and the kernel think they are just fine:

# cat /sys/class/drm/card0/error
no error state collected

As per https://01.org/linuxgraphics/documentation/how-report-bugs :

    -- system architecture: x86-64
    -- kernel version: 4.4.0-1.fc24.x86_64
    -- Linux distribution: Fedora 23 with kernel 4.4.0
    -- Machine or mother board model: HP Pavilion 13 x360 s128nr, 1920x1080 IPS Panel by Samsung
    -- Display connector: eDP

Sorry Artem for this delay on getting back to you. Is this still valid problem? Or have you updated your kernel and not seeing this anymore?

(In reply to Jari Tahvanainen from comment #6)
> Sorry Artem for this delay on getting back to you. Is this still valid
> problem? Or have you updated your kernel and not seeing this anymore?

This has been long resolved.

(In reply to Artem S. Tashkinov from comment #7)
> (In reply to Jari Tahvanainen from comment #6)
> > Sorry Artem for this delay on getting back to you. Is this still valid
> > problem? Or have you updated your kernel and not seeing this anymore?
> 
> This has been long resolved.

Thanks Artem