Hi,
I'm testing the vanilla kernel on prototype boards for Intel Skylake. The graphics adapter on those boards identifies like this:
00:02.0 0300: 8086:1912 (rev 04) (prog-if 00 [VGA controller]) Subsystem: 1734:121c 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 Interrupt: pin A routed to IRQ 123 Region 0: Memory at d0000000 (64-bit, non-prefetchable) [size=16M] Region 2: Memory at c0000000 (64-bit, prefetchable) [size=256M] Region 4: I/O ports at f000 [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
I'm running both Fedora 21 and OpenSUSE 13.2 on those boards at the moment, both with a self compiled Kernel 4.1-rc4 (latest git pull was today).
Problem: Whenever power management kicks in and blanks the screen the systems behave very strange when trying to get the screen back. The screen is not fully restored then, but when I move the mouse (Gnome 3 or XFCE desktops) up and down the image rolls up and down like a curtain. I see no mouse cursor anymore and can't resume to normal operation.
When this happens I see the following line in dmesg:
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
Hardware is still the first prototypes for Skylake, BIOS is beta too. But I wanted to give a note about that problem here, maybe someone has an idea what is missing.
Regards Rainer