Re: PROBLEM: i915 regression between 2.6.39-rc6 and 2.6.39-rc7

[Michael Larabel <michael.larabel@phoronix.com>]

Try booting the latest kernel with "i915.semaphores=1" and it should be 
fixed, at least for my SNB hardware. When I had it auto-bisected it came 
down to this commit 087fbc9962e10a65fb0b542ecfc116ebf6cf1735 that 
disabled semaphores.

-- Michael Larabel

On 05/17/2011 07:06 AM, Eric Leblond wrote:
> Hello,
>
> When running the 2.6.39-rc7, I've observed a problem on my laptop (DELL
> XPS15) which uses the i915 driver. Frequently, when moving the mouse
> over, the cursor does only trigger the modification on the desktop after
> a few seconds (like icons
> highligthing). When this occurs, the following message appear in the
> kernel log at the moment when the waited action occurs:
>
> [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 905, at 905], missed IRQ?
>
> Switching back to 2.6.39-rc6 fixes the issue.
>
> It runs gnome 3 which uses glx to add some effect. Maybe this is linked.
> When using the simple twm window manager, the problem does not seem to
> occur.
>
> Keywords: drm, i915
> Kernel version: Linux version 2.6.39-rc7+ (eric@tiger) (gcc version 4.6.1 20110507 (prerelease) (Debian 4.6.0-7) ) #3 SMP Sun May 15 11:31:14 CEST 2011
> Processor: Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
>
> Kernel log for i915:
> May 17 13:30:36 tiger kernel: [   15.458754] i915 0000:00:02.0: PCI INT A ->  GSI 16 (level, low) ->  IRQ 16
> May 17 13:30:36 tiger kernel: [   15.458760] i915 0000:00:02.0: setting latency timer to 64
> May 17 13:30:36 tiger kernel: [   15.513847] i915 0000:00:02.0: irq 52 for MSI/MSI-X
> May 17 13:30:36 tiger kernel: [   16.011208] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
> May 17 13:31:12 tiger kernel: [   59.343937] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 905, at 905], missed IRQ?
> May 17 13:31:17 tiger kernel: [   63.998439] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 947, at 947], missed IRQ?
> May 17 13:32:27 tiger kernel: [  134.591975] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 49015, at 49015], missed IRQ?
> May 17 13:32:29 tiger kernel: [  136.127493] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 49154, at 49154], missed IRQ?
>
> lspci -vvvv for i915:
> 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
>          Subsystem: Dell Device 04b6
>          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 52
>          Region 0: Memory at f1400000 (64-bit, non-prefetchable) [size=4M]
>          Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
>          Region 4: I/O ports at 4000 [size=64]
>          Expansion ROM at<unassigned>  [disabled]
>          Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
>                  Address: fee0300c  Data: 41c9
>          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: [a4] PCI Advanced Features
>                  AFCap: TP+ FLR+
>                  AFCtrl: FLR-
>                  AFStatus: TP-
>          Kernel driver in use: i915
>
> lspci:
> 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
> 00:01.0 PCI bridge: Intel Corporation 2nd Generation Core Processor Family PCI Express Root Port (rev 09)
> 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
> 00:16.0 Communication controller: Intel Corporation 6 Series Chipset Family MEI Controller #1 (rev 04)
> 00:1a.0 USB Controller: Intel Corporation 6 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
> 00:1b.0 Audio device: Intel Corporation 6 Series Chipset Family High Definition Audio Controller (rev 05)
> 00:1c.0 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 1 (rev b5)
> 00:1c.1 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 2 (rev b5)
> 00:1c.3 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 4 (rev b5)
> 00:1c.4 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 5 (rev b5)
> 00:1c.5 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 6 (rev b5)
> 00:1d.0 USB Controller: Intel Corporation 6 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
> 00:1f.0 ISA bridge: Intel Corporation HM67 Express Chipset Family LPC Controller (rev 05)
> 00:1f.2 SATA controller: Intel Corporation 6 Series Chipset Family 6 port SATA AHCI Controller (rev 05)
> 00:1f.3 SMBus: Intel Corporation 6 Series Chipset Family SMBus Controller (rev 05)
> 01:00.0 VGA compatible controller: nVidia Corporation Device 0df5 (rev a1)
> 03:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
> 04:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)
> 06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
>
> ver_linux output:
> Linux tiger 2.6.39-rc7+ #3 SMP Sun May 15 11:31:14 CEST 2011 x86_64 GNU/Linux
>
> Gnu C                  4.6.1
> Gnu make               3.81
> binutils               2.21.51.20110421
> util-linux             2.17.2
> mount                  support
> module-init-tools      3.12
> e2fsprogs              1.41.12
> pcmciautils            018
> PPP                    2.4.5
> Linux C Library        2.13
> Dynamic linker (ldd)   2.13
> Procps                 3.2.8
> Net-tools              1.60
> Kbd                    1.15.2
> Sh-utils               8.5
> wireless-tools         30
> Modules Loaded         parport_pc ppdev lp parport bluetooth acpi_cpufreq mperf cpufreq_stats cpufreq_conservative cpufreq_userspace cpufreq_powersave vboxnetadp binfmt_misc vboxnetflt vboxdrv uinput fuse ip6t_LOG nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipt_LOG xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables ext2 nouveau ttm loop snd_hda_codec_hdmi snd_hda_codec_realtek uvcvideo videodev v4l2_compat_ioctl32 joydev arc4 ecb snd_hda_intel iwlagn snd_hda_codec i915 snd_hwdep snd_pcm drm_kms_helper mac80211 snd_seq snd_timer snd_seq_device drm snd cfg80211 dell_wmi soundcore dell_laptop psmouse sparse_keymap processor battery ac i2c_algo_bit i2c_i801 rfkill snd_page_alloc i2c_core video button dcdbas power_supply pcspkr w
 mi evdev serio_raw ext3 jbd mbcache sha256_generic cryptd aes_x86_64 aes_generic cbc dm_crypt dm_mod sg usbhid usb_storage hid sd_mod sr_mod uas cdrom crc_t10dif xhci_hcd ahci libahci libata
  s
>
>   csi_mod r8169 ehci_hcd thermal thermal_sys usbcore mii
>
> BR,
> --
> Eric Leblond
>
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