For 3com that was fixed in 2.4-ac months ago. There is a mostly
undocmented power management bitflag that some bioses seem to know about
> - (Possibly linked to above bug) VIA APIC routing is currently broken.
> boot with 'noapic'.
Does 2.5 not have the INTD routing fix yet ?
> - The hptraid/promise RAID drivers are currently non functional, and
> will probably be converted to use device-mapper.
> - Some filesystems still need work (Intermezzo, UFS, HFS, HPFS..)
The hfsplus file system is missing from 2.5 at the moment
> - Some people seem to have trouble running rpm, most notably Red Hat 9 users.
> This is a known bug of rpm.
> Workaround: run "export LD_ASSUME_KERNEL=2.2.5", before running rpm.
or upgrade to rpm 4.2 (which I'd recommend everyone does anyway as it
fixes a load of other problems) - ftp.rpm.org
> - Older Direct Rendering Manager (DRM) support (For XFree86 4.0)
> has been removed. Upgrade to XFree86 4.1.0 or higher.
The current 2.5 DRM doesnt seem to work with 4.1, but does with 4.3 at
least on my testing of i810. I need to double check the results unless
others see the same
> - For Red Hat users, there's another pitfall in "/etc/rc.sysinit".
> During startup, the script sets up the binary used to dynamically load
> modules stored at "/proc/sys/kernel/modprobe". The initscript looks
> for "/proc/ksyms", but since it doesn't exist in 2.5 kernels, the
> binary used is "/sbin/true" instead.
Better to cite the explanation and fix in the FAQ/README for the new
module tools 8)
> Enhanced coredumping.
> - 2.5 offers you the ability to configure the way core files are
> named through a /proc/sys/kernel/core_pattern file.
> You can use various format identifiers in this name to affect
> how the core dump is named.
So does 2.4 8)
2.4-ac also offers setuid core dump facilities I need to forward port
> - Multithreaded processes can now dump core
> - Known problems with the current IDE code.
> o Serverworks OSB4 may panic on bad blocks or other non fatal errors
> o PCMCIA IDE hangs on eject
Should be fixed in 2.5, fixed(ish) in 2.4
> o ide_scsi is completely broken in 2.5.x. Known problem. If you need it
> either use 2.4 or fix it 8)
> - IDE disk geometry translators like OnTrack, EZ Partition, Disk Manager
> are no longer supported. The only way forward is to remove the translator
> from the drive, and start over.
Or to use device mapper to remap the disk.
> CD Recording.
> - Jens Axboe added the ability to use DMA for writing CDs on
> ATAPI devices. Writing CDs should be much faster than it
> was in 2.4, and also less prone to buffer underruns and the like.
Currently generally crashes the machine on problems or if you have
anything touching the other channel
> - gcc 3.2.2-5 as shipped by Red Hat generates incorrect code in the
> kmalloc optimisation introduced in 2.5.71
> See http://linus.bkbits.net:email@example.com
This URL appears wrong!
> to 2.5. For this reason 2.5.x kernels should not be tested on
> untrusted systems. Testing known 2.4 exploits and reporting results
> is useful.
There is at least one known local root exploit in 2.5.75
> - 2.5 features support for several new architectures.
> - x86-64 (AMD Hammer)
> - ppc64
> - UML (User mode Linux)
> See http://user-mode-linux.sf.net for more information.
> - uCLinux: m68k(w/o MMU), h8300 and v850. sh also added a uCLinux option.
> - The 64 bit s390x port got collapsed into a single port, appearing
> as a config option in the base s390 arch.
> - In the opposite direction, arm26 was split out from arm.
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