Binary package hint: linux-source-2.6.22
On an Everex StepNote 2053T laptop, loading the sdhci module causes the machine to hang completely. SysRq keys don't work, and the only way to reboot is to hold the power switch down.
This is a major problem, because the install disk and/or live CD tries to load the module, so you can't install off a standard Ubuntu disk.The only way to boot up is to blacklist this kernel, or buld a kernel without the sdhci module.
This affects kernels 2.6.20 through 2.6.24; I haven't tested earlier ones. I've found this problem on Ubuntu kernels from Feisty, Gutsy, and Hoary Alpha 3 distributions, as well as straight kernel.org kernels that I built from source (2.6.20, 2.6.22, 2.6.23, and 2.6.24 releases; didn't technically test 2.6.21 but I imagine it's the same). There are no obvious compile options for this module either, and no bootup options.
The card reader on this laptop is apparently an O2 Micro MMC, SD, Memory Stick. Here's the lspci output that seems relevant:
03:06.2 Generic system peripheral [0805]: O2 Micro, Inc. Integrated MMC/SD Controller [1217:7120] (rev 01)
03:06.3 Mass storage controller [0180]: O2 Micro, Inc. Integrated MS/xD Controller [1217:7130] (rev 01)
If you need more info, or want someone to test solutions to this bug, be sure to let me know. I'm comfortable applying patches, building kernel.org source, running commands, etc.
The laptop testing page for this laptop (with more info about it) is here: https://wiki.ubuntu.com/LaptopTestingTeam/EverexStepNoteSA2053T -- it is also affected by Bug #90271, which also makes it impossible to boot (due to 8139too module issue).
It's likely that this bug also affects the following laptops:
* Averatec 2460
* Everex Stepnote SA2050
* Everex Stepnote SA2050T
* Everex StepNote SA2052T
* Everex StepNote SA2053T
* Philips Freevents x52
* Philips Freevents x53
* Philips Freevents x54
* Philips Freevents x55
* Philips Freevents x56
* Twinhead H12Y
(apparently these are all OEM models of the same laptop, as per a comment on Bug #90271)