On Mon, Mar 18, 2013 at 3:05 PM, Jiri Kosina <jkosina@xxxxxxx> wrote: > On Mon, 18 Mar 2013, Yinghai Lu wrote: > >> > Yes, switching from MSI to IO-APIC-fasteoi makes the report about lost >> > interrupts go away. >> > >> > My understanding from the other mail is that DAniel Vetter already has an >> > idea what might be going wrong with IRQ acking on GM45 chipsets; hopefully >> > this datapoint regarding MSI will fit into it. >> >> What is /proc/interrupts difference between with and without pci=nomsi ? >> >> drm is forced to share irq 16? > > Yup, IRQ 16 is being shared, and one of the owners is i915. the vga report strange INTx status... 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device 20e4 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 44 Region 0: Memory at f2000000 (64-bit, non-prefetchable) [size=4M] Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M] Region 4: I/O ports at 1800 [size=8] Expansion ROM at <unassigned> [disabled] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Address: fee0100c Data: 4142 Capabilities: [d0] Power Management version 3 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: i915 Kernel modules: i915 it should be INTx-, after we have set DisINTx+ in control. So INTx can not be disabled after it get enabled before ? the VGA on my T420 looks right. 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device 21ce 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- Thanks Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
