Linux 2.6.39-rc3

Joerg Roedel joro at
Tue Apr 12 02:02:07 PDT 2011

On Mon, Apr 11, 2011 at 05:40:11PM -0700, Linus Torvalds wrote:
> Let's hope the release cycle continues like this. I _like_ it when
> people really seem to follow the whole "big changes during the merge
> window" rules.

Sorry for disturbing the silence, but radeon seems to have issues. I
tested -rc3 (and after that -rc1 which also has the issue) on my Laptop
and it just reboots after (or while?) GFX initialization. The last lines
of dmesg are:

 Freeing unused kernel memory: 624k freed
 Write protecting the kernel read-only data: 8192k
 Freeing unused kernel memory: 1456k freed
 Freeing unused kernel memory: 16k freed
 udev: starting version 151
 udevd (62): /proc/62/oom_adj is deprecated, please use /proc/62/oom_score_adj instead.
 [drm] Initialized drm 1.1.0 20060810
 [drm] radeon defaulting to kernel modesetting.
 [drm] radeon kernel modesetting enabled.
 radeon 0000:01:05.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
 [drm] initializing kernel modesetting (RS880 0x1002:0x9712).
 [drm] register mmio base: 0xD6400000
 [drm] register mmio size: 65536
 radeon 0000:01:05.0: VRAM: 320M 0x00000000C0000000 - 0x00000000D3FFFFFF (320M used)
 radeon 0000:01:05.0: GTT: 512M 0x00000000A0000000 - 0x00000000BFFFFFFF
 [drm] Detected VRAM RAM=320M, BAR=256M
 [drm] RAM width 32bits DDR
 [TTM] Zone  kernel: Available graphics memory: 1896512 kiB.
 usb 7-2: new full speed USB device number 2 using ohci_hcd
 [TTM] Initializing pool allocator.
 [drm] radeon: 320M of VRAM memory ready
 [drm] radeon: 512M of GTT memory ready.
 [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
 [drm] Driver supports precise vblank timestamp query.
 [drm] radeon: irq initialized.
 [drm] GART: num cpu pages 131072, num gpu pages 131072
 [drm] Loading RS780 Microcode
 radeon 0000:01:05.0: WB enabled
 [drm] ring test succeeded in 1 usecs
 [drm] radeon: ib pool ready.

The card is a Radeon Mobility 4200:

01:05.0 VGA compatible controller: ATI Technologies Inc M880G [Mobility Radeon HD 4200]
        Subsystem: Hewlett-Packard Company Device 307e
        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 18
        Region 0: Memory at c0000000 (32-bit, prefetchable) [size=256M]
        Region 1: I/O ports at 6000 [size=256]
        Region 2: Memory at d6400000 (32-bit, non-prefetchable) [size=64K]
        Region 5: Memory at d6300000 (32-bit, non-prefetchable) [size=1M]
        Capabilities: [50] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [a0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
                Address: 0000000000000000  Data: 0000
        Kernel driver in use: radeon
        Kernel modules: radeon

The problem does not happen with 2.6.38. I try to bisect this further down to a
commit. Alex, please let me know if you need any further information.


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