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

Tue May 17 05:06:07 PDT 2011

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 at 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 wmi 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 scsi_mod r8169 ehci_hcd thermal thermal_sys usbcore mii

BR,
--
Eric Leblond