My Toshiba A70 laptop's SD card reader with PCI ID 1524:0550 (part of an ENE CB-710/2/4 Cardbus Controller) doesn't work with Linux. I haven't tried Ubuntu pre-gutsy, but it hasn't worked with Gutsy, Hardy, or Intrepid. I've never seen it work under Linux, so AFAIK this isn't a regression. This hardware is a few years old...
There are various bug reports on very similar hardware, but most reporters haven't been careful to report PCI IDs, or even choose non-generic titles, so the SD card reader bugs are a mess. I'm opening a new one that's just about this specific hardware, instead of trying to revive one of the old bugs.
Note that this not the same as bug 99648. Please look at both and decide if your bug is exactly either of those. If not, open a new bug. (see https://bugs.launchpad.net/ubuntu/+source/linux/+bug/303844/comments/12)
(update: incorporating some of the stuff figured out in the first few comments)
This bug is about the SD reader, while bug 99648 is about the Sony Memory Stick reader not working in a very similar piece of hardware. This bug is about hardware with 4 PCI subdevices (02:04.0 - 02:04.3), not 5 (.0 - .4). The hardware in bug 99648 also has a 1524::0551 PCI device, while the hardware in this bug doesn't. Although it's not clear which of these differences distinguishes between the hardware that Linux's driver handles and the hardware that doesn't work. The problem seems to be lack of documentation from the manufacturer, as usual.
So it's possible you might have this bug even though you have a 1524::0551 PCI device, or if you have 5 PCI subdevices. Please check extra carefully before adding comments here, since all this similar hardware is confusing enough already. If your hardware does have a 1524::0551 device, and the SD reader doesn't work, and it never worked (so it's not a regression, which would require a new bug report), then please say so when you post, so we'll know you read this and we'll be more likely to believe you. Even then, unless someone does some reverse engineering, this hardware will probably never be supported without information from the manufacturer. All we could do with corrections to which hardware is affected is give a more accurate assessment of when you are stuck with incompatible hardware, and when you should keep trying to get the drivers working.
(end update)
OS:
Linux whale 2.6.27-10-generic #1 SMP Fri Nov 21 12:00:22 UTC 2008 i686 GNU/Linux
Ubuntu 2.6.27-10.20-generic
lspci -vvnn:
02:04.0 CardBus bridge [0607]: ENE Technology Inc CB-710/2/4 Cardbus Controller [1524:1411]
Subsystem: Toshiba America Info Systems Device [1179:ff01]
02:04.1 FLASH memory [0501]: ENE Technology Inc ENE PCI Memory Stick Card Reader Controller [1524:0530]
...
02:04.2 SD Host controller [0805]: ENE Technology Inc ENE PCI Secure Digital Card Reader Controller [1524:0550] (prog-if 01)
Subsystem: Toshiba America Info Systems Device [1179:ff01]
Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Interrupt: pin B routed to IRQ 17
Region 0: Memory at d0215000 (32-bit, non-prefetchable) [size=256]
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Kernel modules: sdhci-pci
02:04.3 FLASH memory [0501]: ENE Technology Inc FLASH memory: ENE Technology Inc: [1524:0520]
...
shdci-pci loads ok,
[458502.494499] sdhci: Secure Digital Host Controller Interface driver
[458502.494511] sdhci: Copyright(c) Pierre Ossman
[458502.503353] sdhci-pci 0000:02:04.2: SDHCI controller found [1524:0550] (rev 0)
[458502.503386] sdhci-pci 0000:02:04.2: PCI INT B -> GSI 17 (level, low) -> IRQ 17
[458502.507085] mmc0: SDHCI controller on PCI [0000:02:04.2] using PIO
(see attached dmesg output for the full thing. I can attach a full lspci -vvnn if anyone wants.)
The hardware works with these cards under another OS, so it's the hardware is physically ok. (It is old, though. Even WinXP doesn't work with 2GB SD cards, only 1GB. 2GB isn't even SDHC, which of course doesn't work either.)
When I insert an MMC or SD card, the light on the card reader flashes for a second, then goes out. Nothing is reported in the kernel log, and no /dev/mmc* appears. Inserting a card increases the IRQ count for mmc0 by 2, removing a card generates 1 interrupt.
17: 22500 IO-APIC-fasteoi ATI IXP Modem, ATI IXP, mmc0
Other than that, a whole lot of nothing happens. Unloading and reloading the module repeatedly hasn't helped, so it's not an intermittent problem.
This is _not_ the same hardware that Leu has on bug 31440. I think I have the same hardware as the original submitter (who left -nn out of his lspci args, so I'm not sure), but since that bug has been closed (wontfix) based on Leu's hardware, it would probably be confusing to reopen it.
Someone thinks this hardware has never worked under Linux:
"The 1524:0550 is a dead Dodo. I've never seen any reports of it working at all." from http://osdir.com/ml/linux.drivers.sdhci.devel/2007-09/msg00026.html
But someone else does seem to have had success (with different hardware. CB controller = 1524:1412, which has different subdevices).
http://marc.info/?l=linux-kernel&m=116758515323702&w=2
(yup, turns out this is a different piece of hardware, and doesn't help for this bug.)
no luck with an Edgy livecd (2.6.17-